99 results about "WATER HAZARDS" patented technology

The invention provides a high-water pressure, high-stress and automatic-mining mine water disaster comprehensive analog system and a test method, belonging to the technical field of basic research of water prevention and treatment in a mine. The invention mainly relates to a mine water damage comprehensive analog system which is good in leakproofness, and can simulate the mining, reflect the mutual function between a rock mass at a top plate and a base plate and the water, and obtain the change regularity of solid and liquid physical mechanics parameters under the conditions of high water pressure and high vertical stress. By adopting a cylindrical closed test chamber and an automatic mining analog device in the chamber, the system allows the highest water pressure at 3MPa, applies the maximum vertical load at 3MPa, has the test diameter at 1.4m, and has the sample assembly height at 1.4m. The system comprises a model test chamber, a stable high-water pressure (flow) water supply and control device, a mining simulating and controlling device, a multiple interference flow observing device and an assembly observing subsystem of pressure, stress, temperature and PH value. The invention further establishes a test method for automatically simulating the mining of the dynamic sudden water inflow by the top plate and the base plate of the mine under the conditions of high water pressure and high stress and the real-time monitoring.

The invention discloses a water conservation method for overlying strata water flowing fracture main channel through ground horizontal directional drilling grouting and sealing, which is suitable forthe technical field of water resource conservation in coal mining and mine water damage prevention and control. The method includes the following steps: firstly obtaining development characteristic information of the mined height of the overlying strata water flowing fractured zone in a tested area under specific mining conditions; then according to the development characteristic information, determining the distribution range of an aquiclude area of the overlying strata water flowing fractured zone communication stratum corresponding to the water flowing fracture main channel in the tested area; lastly, after determining position and orientation of the water flowing fracture main channel, constructing horizontal directional drilling on the ground and grouting and sealing the water flowingfracture main channel, thereby achieving the goal of reducing water conductivity of the fracture and conserving groundwater resources. The water conservation method has the advantages of simple steps, reliable effect and strong practicability.

The present invention belongs to the coal mining geophysical prospecting technical field, relates to a transient electromagnetic stack advanced detection device and method, in particular, a coal mine underground roadway transient electromagnetic stack advanced detection device and method. According to the device and method of the invention, a probe is arranged in a borehole, so that the probe can be far away from interference sources such as metal machineries in a roadway, and therefore, the influence of the interference sources can be avoided; the hole drilling conditions of a coal mine tunneling face are fully utilized, so that inside-roadway coil emission and inside-borehole three-component receiving can be realized; and a receiving device can move towards a direction before the tunneling face, and therefore, various kinds of the interference of the metal machineries at the tunneling face can be avoided without affecting the tunneling work of a mine party, and the advanced detection data of a plurality of positions in the borehole can be subjected to stack processing, and processing results can be displayed, and thus, hidden water damage geological bodies before the tunneling face can be predicted at an extra long distance.

The invention relates to a seismic information based coal mine water disaster prediction and evaluation method, and belongs to a coal mine water disaster prediction and evaluation method. The coal mine water disaster prediction and evaluation method comprises three lithologic interpretation methods such as a seismic attribute method, a seismic lithologic inversion method and a probability neural network inversion method; factors influencing water inrush of coal seam roof and floor fall into three categories such as construction, lithology and hydrogeology; construction, lithology and hydrogeology information is acquired by using various lithologic seismic interpretation methods, quantization is carried out on the information, a prediction and evaluation model taking the three types of influencing factors into consideration is established, the water inrush danger level of each part of a mining area is predicted and divided, and prediction and evaluation are carried out on a coal mine water disaster. The advantage is that mutual cross technologies of geophysics, mining engineering and hydrogeology are applied so as to provide geological guarantee for water prevention and safety production of coal mines.

The invention belongs to the technical field of mine safety, and relates to an advanced prevention and control method for separation water disasters, in particular to an advanced prevention and control method for coal mine working face roof separation water disasters. According to the advanced prevention and control method for the working face roof separation water disasters, by combining the features of working face mining conditions, cover rock structures and water-resisting-layer-containing hydrogeological conditions, underground drilled holes are used for carrying out water level dredge-lowering on a filled water bearing strata in a separation space; grouting is carried out on the separation space for water flooding, and meanwhile the purpose of thickening an underlying water resistinglayer of the separation space is achieved; the technical scheme of bundled drilling and target drawing-off is adopted for formed separation water bodies, and thus in the working face stoping process,formation of the separation water bodies is avoided, the scale of the separation water bodies is reduced or centralized drawing-off is carried out on large-scale separation water bodies, so that separation water disaster accidents are avoided.

The invention discloses a prevention and treatment method for goaf water under condition of repeated mining of thick seam upper slices destructed by minitype coal mines. The method comprises the following steps: step 1, determining a target area of directional drilling; step 2, constructing a drilling field; step 3, detecting the goaf water-rich anomaly area of the roadway heading face by a transient electromagnetic method and a high-density direct current method; step 4, arranging conventional drilling holes in the roadway heading face for drilling verification, allowing roadway tunneling incase of no anomaly in drilling verification, and treating the goaf water by circulation of water exploitation-tunneling-water exploitation; step 5, performing treatment in case of gushing water in drilling in the process of drilling verification in step 4; step 6, performing treatment if the drainage volume of the conventional drilling holes of the heading face in step 5 tends to be stable for a long time. The goaf water is prevented and treated by combination of ground and downhole geophysical prospection-conventional drilling-directional drilling; advanced, efficient, safe, accurate, large drop and long-distance cut-off and diversion of the goaf water is achieved; and disaster caused by the goaf water is effectively treated.

The invention belongs to the technical field of coal mine early warning, and discloses a coal mine underground water prevention and control early warning system and method and application, and the method comprises the following steps: an advanced exploration and stope face water disaster prediction system carries out coal mine water-containing structure and water guide condition detection, and determines stope face water disaster prevention and control technical measures; the underground water dynamic monitoring system acquires and analyzes corresponding data of underground water by using the mining area hydrological dynamic monitoring system; the mine water source rapid discrimination system is based on existing mine data, adopts geophysical prospecting, drilling and geochemical prospecting methods to carry out testing, analysis and determination of mining area water chemical background characteristics, establishes a mining area water chemical database, establishes a discrimination model of water quality of different aquifers in a well field, and rapidly discriminates various water bursting sources. According to the method, mine water inrush prediction and early warning can be carried out in time, targeted water prevention and control measures can be taken in a targeted mode, and safe, economical and reasonable production of a mine and comprehensive utilization of water resources are guaranteed.

The invention relates to a prediction method for the dynamic growth height of a caving zone, and the method is suitable for height prediction of the caving zone of a large-mining-height working surface of a thick seam layer and is carried out under the condition that an immediate roof internally includes structural rock stratum. The method mainly comprises the following steps that a key layer is determined; the number of overburden layers is determined; when t1<tm', the key layer is positioned in a slit band, and a caving height is calculated to be H4; when tm'+1<ti, the structural rock stratum is positioned in the caving zone straightly, and a caving height is calculated to be H5; when ti+1<tj, the structural rock stratum is positioned in a bent sinking band, and a caving height is calculated to be H6; and when tj+1<tn, a height of the caving zone of a goaf in the total sinking period of the caving zone is calculated to be H7. According to the method, deadweight compressing performance and a time sequence of the caving zone and exploitation caused by that a caving space of the goaf is large are taken into consideration, dynamic distribution the caving zone is divided into four stages of analysis, calculation and prediction, the caving zone of the large-mining-height working surface can be reflected accurately, and basis is provided for support type selection, coal mining technology design, and top board flood damage control.

The invention provides a target layer position tracking method for exploration and treatment of a coal mine water disaster area. The target layer position tracking method comprises the following stepsthat step 1, whether the fault position and fall are determined or not is distinguished; step 2, if the geological data does not belong to any one of the conditions in the step 1, whether the geological data is insufficient or deficient or not is determined; and step 3, target layer position tracking is performed according to the judgment results in the step 1 and the step 2. According to the target layer position tracking method for exploration and treatment of the coal mine water disaster area, the problem of how to reach the designed layer position of a drilling track under the condition of insufficient or deficient fault and geological data in the ground area exploration and treatment process of a mine with a complex geological structure is solved, the technical problem that the drilling can be kept in the designed target layer to continue drilling and reach the designed drilling rate is effectively solved, the drilling track is effectively prevented from deviating from the designed position, a large amount of grout waste and invalid grouting caused by infinite expansion and uncontrollability of grout are reduced, area governance is ensured to achieve the design purpose, and the target layer position tracking method is a beneficial supplement and improvement for the coal mine ground area governance technology.

The invention discloses a direct-current-electric-method-based rapid electrode distribution system for advanced detection of a water hazard in a tunnel and a detection method thereof. The system comprises an infinity electrode and a host, wherein the electrode and the host are connected by a telescopic cable. Besides, the system also includes an automatic carry-bit multi-core testing wire connected with the host; the automatic carry-bit multi-core testing wire consists of a plurality of male and female head aviation plug groups; two male and female head aviation plug groups are connected by a plurality of wedge-shaped testing wires; and each male and female head aviation plug group is connected with a power supply measuring electrode correspondingly. According to the invention, the traditional cable electrode arrangement way is changed and a corresponding number of combined units of female head aviation plugs, wedge-shaped testing wires and female aviation plugs with the corresponding number are added, and thus re arrangement of all electrodes, the testing wire, and the host dost not required and one segment of testing wire, electrode and host need to be moved at a distance corresponding to a tunneling distance, so that the work becomes convenient with less time and effort. The traditional one-tunneling and one-detection mode is changed and real-time tracking and detection on the tunneling working face of the tunnel can be realized, so that the geological anomalous body can be detected timely by multiple times.

The invention provides a bed separation water damage prevention and control method for coal mining, and relates to the technical field of mine geology. The bed separation water damage prevention and control method for coal mining comprises the following steps that mining and geological parameters are acquired before coal mining; a directional drilling implementation area is designed before coal mining; directional drilling is implemented, and perforation is carried out; perforation grouting is carried out after perforation; hole sealing grouting is carried out after perforation grouting; an aquifer observation hole is implemented in the ground after directional drilling and hole sealing; coal mining is carried out, and drainage and supplementary grouting are carried out according to aquifer observation; and no bed separation water damage occurs after coal mining is completed. The method is simple and easy to implement; the influence on the environment is small; the mine water inflow can be reduced, the drainage burden is reduced, and the safety is higher; and the grouting slurry is lower in quantity and price, and the economy and the reasonability are achieved.

The invention discloses a method for evaluating the exploration and treatment effect of a floor limestone water disaster ground advanced area of a coal seam. The method comprises the following steps of evaluating a drilling track in a ground long-distance directional drilling construction process, and scoring all two-stage indexes according to the evaluation standard; according to whether a drilled stratum has structural development or not, correspondingly selecting the evaluation standard of a normal stratum or an abnormal stratum, evaluating a drilling exploration result, and scoring all the two-stage indexes according to the evaluation standard; evaluating the grouting treatment effect, and scoring all the two-stage indexes according to the evaluation standard; and according to scoring results of three sub-items, calculating the sum of weight values corresponding to all evaluation item indexes according to the evaluation index calculation standard to obtain a comprehensive score of the treatment effect, and determining the quality grade of the exploration and treatment engineering effect of the floor limestone water disaster ground advanced area according to the comprehensive score and an evaluation grade table. The method is wide in application range and can comprehensively reflect the actual treatment engineering effect.

The invention provides a curtain closure method for a submersible aquifer dotted vertical water guiding channel. The curtain closure method comprises the following steps of: drilling holes: drilling aplurality of holes within a preset radius range around the dotted vertical water guiding channel, and after the centers of the plurality of holes are connected, surrounding the dotted vertical waterguiding channel in connection lines; and grouting: injecting mortar into the holes, and after the mortar is solidified, obtaining an anti-seepage curtain. According to the above scheme provided by theinvention, an entrapment type curtain body is constructed around the aquifer dotted vertical water guiding channel so as to cut off a submersible aquifer supply water source, a mine water inflow is reduced, water disaster hidden dangers are eliminated, and meanwhile, cost input is greatly saved.

The invention discloses a coal face roof water damage space-time control hydrophobic control method. The method comprises the following steps: 1, analyzing coal face geological and hydrogeological conditions; 2, determining the development height of a water guide fracture zone of the coal face; 3, analyzing a water gushing source of the working face roof water damage; 4, predicting the stable water inflow Q < surge > of the roof aquifer in the stoping process of the working face; 5, determining the spatial position of a final hole of the hydrophobic drill hole; 6, determining the number of hydrophobic drill holes; 7, analyzing the water gushing rule of the underground hydrophobic drill hole; and 8, determining the hydrophobic period of the hydrophobic drill hole. Therefore, the final holepositions and the number of the drill holes of the drainage drill holes are controlled in space, the drainage period of the drainage drill holes is controlled in time, and space-time control over drainage prevention and control over water damage of the coal face roof is achieved.

The invention relates to a method for inhibiting mining damage depth based on clay-based slurry advanced grouting modified floor hard rock. The method starts from reducing or inhibiting damage depth or range of mining disturbance to a coal seam floor on the premise of not changing a coal mining process, advanced fracturing is conducted on a rock stratum with a certain layer position and thicknesswithin an original mining damage range through a ground or underground horizontal directional drill, penetration of a fracture network in the rock stratum is achieved, then clay-based slurry is injected into the penetration fracture network, the original rock stratum is modified into a clay flexible stratum, the flexible stratum can buffer vertical transmission of advance supporting pressure in afloor rock stratum in the mining process, so that the floor damage depth or range is restrained or reduced, and the purpose of preventing and treating water damage of the coal mine floor is achieved.

The invention relates to a river-side coal mine old goaf water disaster inspection and treatment integrated treatment method. The method comprises the following steps that a waterproof curtain inspection and treatment exploration line is arranged between an earth surface river and a mine area boundary, and the waterproof curtain inspection and treatment exploration line passes through an underground goaf in a to-be-treated mine area; in the exploration drilling construction process on the waterproof curtain inspection and treatment exploration line, grouting plugging is conducted on the interior of an exploration drilling hole of an exposed goaf, a curtain wall grouting section is formed, and the curtain wall grouting section and a solid stratum section jointly form a waterproof curtain wall. By constructing the curtain wall, supply of surface rivers to the old goaf is effectively isolated, the threat of shallow water to mine mining is relieved, the construction period is short, the cost is low, and the blocking effect is good.

The invention discloses a method for identifying bed separation water inrush. The method comprises the following steps of determining formation conditions of a coal seam roof bed separation water inrush process; classifying the bed separation water disasters by combining a bed separation water inrush mechanism and water inrush characteristics; and carrying out possibility analysis on the mining area bed separation water inrush. The exploitation coal seam roof bed separation water inrush is a dynamic process, the formation, development and final end of the coal seam roof bed separation water inrush are roughly subjected to three stages of bed separation space formation, bed separation space water accumulation and bed separation water inrush, the formation conditions of each stage are researched and analyzed, and bed separation water disasters are classified by combining the bed separation water inrush mechanism and the water inrush characteristics; and bed separation water inrush possibility analysis is carried out according to the formation condition of each stage and the rock stratum lithology of a mining area.

The invention relates to the technical field of mineral exploitation, in particular to a degradation effect control method for weak-cementation strong-expansion high-water-rich soft rock. The method comprises the following steps that drainage is conducted in the tunneling working process; top plate water spraying, bottom plate water seepage and production water are managed in the production process, and water is prevented from making contact with rocks; and reinforced support is carried out on a roadway. By means of massive water prevention and control, small water volume management and reinforced support as well as cooperative management of massive water prevention and control, small water volume management and reinforced support, the water yield condition of a stratum and the water catchment time condition of a separation space can be changed through massive water prevention and control, the source treatment effect is obvious, water disasters are avoided, and then the coal mining efficiency is improved; and through small water volume prevention and control, a tunneling working face is not troubled by water any more, the tunneling working face does not return to a rear way for repair during tunneling, and the monthly tunneling footage is stably improved under the condition that the mechanization degree is not obviously improved. The deformation of the roadway is effectively controlled through reinforced support and collaborative management.

The invention discloses an advanced treatment method and system for a collapse column based on a laminated multi-branch horizontal well. After the position of the karst collapse column is determined, a karst collapse column fracture area is selected in advance, a water stop plug with a sufficient range and a sufficient thickness is precisely built between a karst water filling water source and a to-be-stoped coal seam by adopting the laminated multi-branch horizontal well, the connection between high-pressure karst water and the stoped coal seam is blocked, and the water inrush threat is eliminated. The advanced treatment of the karst collapse column is a beneficial attempt for changing the passive reason of collapse column water disaster treatment into the active reason, and technical support is provided for building a coal mine water prevention and control intrinsic safety type mine.

The invention relates to a mining amphibious breathing self-rescuer with a protecting cap, which comprises a protecting cap 1, a back plate 5, a back strap 6, a high-pressure air bottle 7, a pressure reducer 8, a breathing air box mouthpiece 9, a separate face mask 10, a pressure gauge 11, and the like. A cushion blocking 4 is arranged on the inner side of the protecting cap 1; a neck 2 of a strap 3 is arranged on the protecting cap 1; and the protecting cap 1 can be connected with the high-pressure air bottle 7 or the back plate 5 through the strap 3. The protecting cap can protect the high-pressure air bottle and prevent the high-pressure air bottle on the back from colliding with the top of a laneway or a borehole wall and from being damaged, and further avoid accidents, such as the explosion of the high-pressure air bottle. After water trouble accidents happen to various mines, miners under water can use the mining amphibious breathing self-rescuer with the protecting cap to safely and quickly escape from the water.

The invention belongs to the technical field of hydrological monitoring, and discloses a mine underground water dynamic monitoring system, a control method and application. A monitoring computer is connected to an intelligent water level remote sensing instrument through a remote communication adapter, and the intelligent water level remote sensing instrument is installed in a field hydrological observation hole. According to the mine underground water dynamic monitoring system, the control method and the application, through research and application of a comprehensive mine water disaster prevention and control technology, a mine water chemical laboratory and an automatic real-time monitoring system for water conditions above and below the mine are established, a rapid water inrush source judgment system and a prevention and control key technology system suitable for mine area water disaster characteristics are formed, mine water inrush prediction and early warning are carried out in time, the method has important guiding significance on mine water prevention and control work, safe production and construction of a mine are guaranteed, a reference function is provided for the surrounding mine water prevention and control work with similar hydrogeological conditions, coal mine water inrush risk evaluation and control technology system construction are completed, a mine water source rapid judgment and mine underground water dynamic monitoring system and emergency mechanism linkage system is formed, and a mining area water prevention and control comprehensive management system is perfected.

The invention relates to a goaf grouting treatment method for secondary mining of an old goaf of an extra-thick coal seam. The method comprises the following steps: step 1, determining a plane boundary of a re-mining area; 2, calculating and determining a re-mining treatment vertical boundary; 3, determining the layout mode of ground directional drilling and underground drainage drilling, the probing layer position, the horizontal distance, the construction sequence and the drilling structure requirement; 4, parameters such as grouting materials, pressure, ending standards, grouting sequences and cooperation of grouting and drilling under different working conditions are determined; and 5, checking and reinforcing the grouting filling effect. The method effectively solves the problem of safe and efficient mining of multiple disasters such as water disasters, fire areas, harmful gases and broken roofs confronted by re-mining of residual coal in the extra-thick coal seam in a non-standard mining mode in the prior art, good effects of multi-disaster-source disaster control, space filling and coal rock consolidation in a re-mining area are achieved, and favorable conditions for safe mining are created for re-mining of residual coal in the extra-thick coal seam.

The invention relates to a coal seam roof aquifer ground advanced pre-drainage method. The method comprises the steps that a ground multi-branch updip horizontal well is constructed, and each branch hole of the updip horizontal well penetrates through an enriched water area of a roof aquifer; a large-diameter drainage well leading to the enriched water area of the roof aquifer is constructed, and the large-diameter drainage well is in communication with the updip horizontal well; and a drainage device is put into the large-diameter drainage well, and drainage treatment is conducted through the drainage device. The method can overcome the defects of the existing coal seam roof water disaster treatment technology, can completely remove hidden dangers of the coal seam roof aquifer to be mined before a regional coal mine is not well-built, guarantees that no roof water disaster influence exists in the whole coal mine from well building to well shut-in, and realizes safe, efficient and continuous coal seam mining.

The invention relates to the technical field of mine water disaster monitoring, in particular to a method for judging an alarm threshold value for water disaster micro-earthquake. The method comprises the following steps that S1, geophysical prospecting data, geochemical prospecting data and hydrological data are obtained in real time; S2, fusion processing is carried out on the geophysical prospecting data, the geochemical prospecting data and the hydrological data to obtain fusion data; S3, optimization training is carried out on the fusion data by adopting a deep learning space-time sequence prediction algorithm to obtain trained fusion data; S4, on the basis of the trained fusion data, an intelligent early warning model of water disaster early warning grade classification is constructed in combination with static indexes of coal seam water inrush influence factors and real-time monitoring dynamic indexes; and S5, according to the intelligent early warning model, grade classification is carried out on the water disaster micro-earthquake to obtain a water disaster micro-earthquake grade, and according to the water disaster micro-earthquake grade, a corresponding alarm threshold value is determined. The alarm threshold can be dynamically adjusted according to different current environments, and the technical problem that dynamic adjustment cannot be carried out according to different current environments is solved.

The invention discloses a coal mine old goaf water inrush monitoring and judging method, and relates to the field of coal mine old goaf water disaster monitoring. Due to the influence of mining, a plastic failure area, namely a top plate water flowing fissure zone and a bottom plate failure zone (the depth is marked as h1) is developed in a certain range of a top plate and a bottom plate of the old goaf; when a finished rock stratum (an effective water-resisting layer, the thickness of which is recorded as h) between a roof water-guiding fissure zone (the height is recorded as h2) generated during mining of a coal seam below an old goaf and a bottom plate failure zone of an overlying old goaf is thin, under the action of an overlying rock mass and the water pressure of the old goaf, the effective water-resisting layer possibly generates plastic failure, a water-guiding channel is formed, and the water-guiding fissure zone is prevented from falling off. Therefore, accumulated water in the top old goaf enters the mining working face of the lower coal seam to cause a water inrush accident. The effective water-resisting layer of the roof old goaf may be subjected to shear failure or tension failure, so that a comprehensive criterion is formulated, whether the risk of water inrush exists or not can be visually seen, and precursor information of water inrush can be reflected.

The embodiment of the invention discloses a method for determining a directional drilling grouting layer position of a coal seam floor confined aquifer, and belongs to the field of mine water damage prevention and control. Parting the water-bearing and water-resisting layer structures of the coal seam floor, and determining the distribution condition of the main water-bearing layer on the coal seam floor; performing aquifer integrity coefficient calculation and evaluation on the determined main aquifer, and selecting the aquifer with deposition continuity and stability as a pre-selected grouting target layer; obtaining the mining damage depth Cp of the bottom plate and the water blocking coefficients zi of different lithologic rock strata of the bottom plate; calculating and evaluating thewater-resisting layer and water pressure elements of the pre-selected grouting target layer, and preliminarily determining a directional drilling grouting layer position; testing and evaluating the hydraulic relationship between the pre-selected grouting target layers; and comprehensively determining the directional drilling grouting horizon according to the preliminarily determined directional drilling grouting horizon and the obtained interlayer hydraulic relationship. And a better directional drilling grouting layer position can be conveniently and reliably determined, so that the effect of treating water disasters in a directional drilling area can be improved.

The invention provides an overlying strata fissure zone influence factor weight analysis method based on a grey system theory. The method relates to the technical field of mine exploitation water disaster prevention and control, and comprises the steps of firstly, determining influence factors of the development height of the overlying strata water flowing fractured zone after coal seam exploitation to be evaluated, performing dimensionless processing on specific parameters of all the influence factors, and an initial matrix of a grey correlation analysis method is formed; then calculating anabsolute difference matrix and an association coefficient matrix, solving a maximum difference and a minimum difference, and obtaining a gray association degree of each influence factor; finally, according to the gray correlation degree, obtaining the weight sequence of the influence factors of the overlying strata damaged water flowing fractured zone, and mine water damage can be prevented and treated in a targeted mode according to the sequence. According to the method, the sensitivity problem of factors influencing the development height of the mine water flowing fractured zone is solved, abasis can be provided for water damage prevention and control of coal mining under the overlying strata aquifer, underwater mining disasters are effectively reduced, and coal mine safety production is guided.

The invention discloses a method for evaluating the degree of influence of a coal mining work surface on shallow groundwater, which comprises the following steps of: monitoring shallow groundwater level drop depth and surface subsidence in a recovery process, obtaining dynamic change data of groundwater level and surface subsidence, analyzing a relationship between the groundwater level drop depth and the surface subsidence; and determining the influence level of mining on underground water. The method is novel, the steps of the method are simple, the evaluation method can be provided for the influence of stoping of the coal face on shallow groundwater, the coal face can be designed according to the evaluation result, water-preserved coal mining is achieved, and water damage accidents can be effectively predicted.

The invention discloses a coal mine thick and hard sandstone roof water disaster and rock burst composite disaster treatment method which comprises the following steps: determining the height of a water flowing fractured zone, and then determining the position of a thick and hard sandstone aquifer within the height range of the water flowing fractured zone; determining a thick and hard sandstone aquifer mining influence range boundary R; determining the horizontal distance S1 between the lateral curtain of the boundary of the first mining working face and the lateral boundary of the goaf; the arrangement position of a first continuous lateral curtain is determined; a boundary lateral curtain and a first continuous lateral curtain are constructed through hydraulic fracturing grouting; lateral water interception and seepage prevention and normal stoping of the first mining working face are completed; lateral water interception and seepage prevention and normal stoping of the first continuous working face are completed; lateral water interception and seepage prevention are conducted on the second continuous working face; and so on, until the coal seam in the mining area or the panel is completely mined. According to the method, cooperative prevention and control of roof water disasters and rock burst disasters are achieved, the mine water inflow is greatly reduced finally, and the prevention and control effect of getting twofold results with half the effort can be achieved.

The invention relates to the technical field of coal seam floor damage depth monitoring, and provides a mining coal seam floor damage depth monitoring method which comprises the following steps: determining a water guide damage zone according to fracture development conditions and water guide properties before and after coal seam floor recovery, and determining a stress-strain zone according to strain change conditions before and after coal seam floor recovery, determining a physical property difference zone according to the physical property change condition before and after the coal seam floor is stoped; and monitoring the damage depth of the coal seam floor during mining according to the water diversion damage zone, the stress-strain zone and the physical property difference zone. The coal seam floor can be divided into a water guide failure zone, a stress-strain zone and a physical property difference zone through a point-line-plane full-space and multi-parameter cooperative monitoring mode, the influence degree of the coal seam floor during mining can be analyzed, the failure condition of the coal seam floor can be monitored, and the coal seam floor can be protected from being damaged by the water guide failure zone, the stress-strain zone and the physical property difference zone. And scientific risk prediction, safety prediction and water disaster prevention and control schemes can be formulated.