32results about How to "Guarantee safe mining" patented technology

The invention discloses a method of a beside-pillar double-side total-filling ascending re-mining overhead coal seam. In the invention, on the basis of determining overhead coal seam mining feasibility and detecting distribution situations of a coal pillar group and a mined area group of a reamer-pillar remnant mining area, a beside-pillar double-side total-filling method is employed for successively side-protecting the coal pillar group in the underlie reamer-pillar remnant mining area of the overhead coal seam and gradually mining the overhead coal resources. By means of the method, a beside-pillar double-side filling body formed in the mined area group can not only achieve a side-protecting effect on the reamer-pillar coal pillar group but also form a common bearing body therewith, thereby further reducing degree of stress concentration and creep deformation of the coal pillar group. The method can enhance long-term stability, can avoid local instantaneous unstability or domino-like unstable damage and finally can ensure safe mining of the overhead coal seam of the reamer-pillar remnant mining area.

The invention discloses a method for pillar adjacency single side partial filling of an ascending re-mining hollow coal seam. Based on discrimination of hollow coal seam ascending mining feasibility and ascertaining of distribution statuses of a knife-pillar type residual mining area coal pillar group and a knife-pillar type residual mining area empty area group, the method for pillar adjacency single side partial filling comprises that the hollow coal seam underlying knife-pillar type residual mining area coal pillar group is successively laterally protected, and hollow coal resources are gradually mined. A pillar adjacency single side partial filling body formed in the empty area group not only can play a role in laterally protecting the knife-pillar type coal pillar group, but also can form a common supporting body with the coal pillar group, so as to reduce the stress concentration degree and creep deformation of the coal pillar group, enhance the long-term stability, avoid occurrence of local instantaneous instability or 'domino' type instability damage, and ultimately ensure safe mining of a knife-pillar type residual mining area overlying hollow coal seam.

The invention relates to the technical field of coal mining, in particular to a coal underground gasification and coalbed methane collaborative mining method and structure and a construction method. The coal underground gasification and coalbed methane collaborative mining method comprises the following steps that in a target coalbed, coal underground gasification is carried out on a lower coalbed, and coalbed methane extraction is carried out on an upper coalbed at the same time, wherein the lower coalbed is adjacent to the upper coalbed, and the lower coalbed is located below the upper coalbed. The method aims to combine coal underground gasification with coalbed methane exploitation, fully exploit coal underground gasification for complex difficult-to-exploit coalbeds, fully utilize heat generated by coal underground gasification, further assist in extraction of coalbed gas in the upper coalbed, further reduce the content of coalbed gas in the coalbeds and guarantee safe and efficient extraction of coal.

The invention discloses a pressure chamber for a coal rock sample gas seepage test. The pressure chamber comprises a round steel cylinder, an annular pressure transmission sleeve, T-shaped end sockets, a PEEK sleeve, a conical steel sleeve, a right piston sleeve, a right first pressing sleeve, a right second pressing sleeve, a left first pressing sleeve and a left second pressing sleeve. A cylindrical coal rock sample cavity is formed between the annular pressure transmission sleeve and the two T-shaped end sockets; and an annular pressure applying cavity is formed between the annular pressuretransmission sleeve and the round steel cylinder. Two annular high-pressure liquid connectors are arranged on the side wall of the round steel cylinder; two axial high-pressure liquid connectors arearranged on the side wall of the right second pressing sleeve; and each of the two T-shaped end sockets is provided with a seepage high-pressure gas and resistivity tester PEEK insulation connector sharing connector. Therefore, the gas seepage conditions of the coal rock sample under underground real conditions of different pressures, different temperatures, underground waves and the like can be simulated truly, so that the test result has the higher practical guiding significance and the reliable guarantee is provided for safe mining of coal rock strata.

The invention relates to a thick and hard top plate rock burst and gas complex disaster comprehensive control method, which belongs to the technical field of mine and underground construction control.The method includes the following steps: adopting large-aperture dense drilling holes to relieve pressure to a coal body, meanwhile, constructing small-aperture gas extraction drilling holes to extract gas to a working face coal body; after going through for a certain time, evaluating the governance effect to the complex disasters of the working face, and if the evaluation result reaches the standard, immediately starting stopping on the working face; during stopping on the working face, adopting a top plate ahead presplitting blasting to relieve pressure to the top plate of the working face;adopting a goaf pipe insertion extraction method if the gas density of an upper corner is still higher during stoping on the working face. According to the invention, the possibility of rock burstingis reduced, and gas content of the working face can be effectively reduced, so that the gas discharge intensity of the working face during stopping can be reduced, and higher technical and economicalvalues are obtained.

The invention discloses a method of a beside-pillar double-side partial-filling ascending re-mining overhead coal seam. In the invention, on the basis of determining overhead coal seam mining feasibility and detecting distribution situations of a coal pillar group and a mined area group of a reamer-pillar remnant mining area, a beside-pillar double-side partial-filling method is employed for successively side-protecting the coal pillar group in the underlie reamer-pillar remnant mining area of the overhead coal seam and gradually mining the overhead coal resources. By means of the method, a beside-pillar double-side filling body formed in the mined area group can not only achieve a side-protecting effect on the reamer-pillar coal pillar group but also form a common bearing body therewith, thereby further reducing degree of stress concentration and creep deformation of the coal pillar group. The method can enhance long-term stability, can avoid local instantaneous unstability or domino-like unstable damage and finally can ensure safe mining of the overhead coal seam of the reamer-pillar remnant mining area.

The invention discloses a curtain grouting technology for an ore body roof karst fracture development and strong water-rich ore deposit. According to the technical scheme, firstly, upward exploration and injection holes are distributed, six upward exploration and injection holes with an elevation angle of five degrees, six upward exploration and injection holes with an elevation angle of 15 degrees and six upward exploration and injection holes with an elevation angle of 25 degrees are distributed in each chamber, the exploration and injection holes are designed with the chambers as base points, all the exploration and injection holes of all the lengths are evenly distributed in the plane with a stagger angle of 60 degrees, the hole depth is 50 m, and the exploration and injection holes with the elevation angle of five degrees, the exploration and injection holes with the elevation angle of 15 degrees and the exploration and injection holes with the elevation angle of 25 degrees are evenly distributed in the plane with a stagger angle of 20 degrees; secondly, downward exploration and injection holes are distributed, the outward and downward exploration and injection holes with the angles of -5 degrees,-30 degrees and -60 degrees are distributed in end chambers, the hole depth is 50 m, all the downward exploration and injection holes are evenly distributed symmetrically in the plane, and the included angle is 10 degrees; thirdly, according to the requirement of accurate mining engineering, grouting is carried out, and a grouting curtain is formed. The grouting curtain with the high water plugging rate is built under a mine according to roof karst fractures, the functions of water separation and reinforcement can be achieved, ore bodies are released safely and efficiently under the protection of the grouting curtain, and technical guarantees are provided for safe and efficient mining of the mine.

The invention discloses a method for performing ascending re-mining on a hollow coal bed by a column with one completely-filled side. On the basis that the feasibility of ascending mining on a hollow coal bed is evaluated and the distribution of coal pillars and mined area in a pillar type mined area has been explored, a method by completely filling the single side of a column is carried out to protect the coal pillars in the pillar type mined area under the hollow coal bed, and thus the coal can be exploited gradually. The fillers, which are formed in the mined area and are near the columns, can protect the coal pillars and bear force together with the coal pillars, thus the stress concentration and creep deformation of the coal pillars are reduced, the stability of the coal pillars in the long term is enhanced, the local and instant disability is avoided or the domino-type destruction caused by disability is avoided, and thus the safe exploitation is guaranteed.

The invention discloses a prejudgment method of the stability of an anchor rod-concrete invert arch heaving floor controlling structure. Through assumptions of basic conditions, a mechanical model ofthe anchor rod-concrete invert arch coupling heaving floor controlling structure is established, through mechanical analysis, the stability discriminant equation of the anchor rod-concrete invert archcoupling heaving floor controlling structure is established, and values of basic parameters of the model are obtained from field data and calculation example analysis conclusions, horizontal stress component, vertical stress component, mechanical coefficient are sequentially calculated, and finally the mechanical coefficient and the parameters of the model are substituted into the stability mechanical discriminant equation to obtain a prejudgment conclusion of whether or not a mine actually has stability after the anchor rod-concrete invert arch coupling heaving floor controlling structure isadopted. According to the prejudgment method, the prejudgment of the structure stability is accurate and comprehensive, a reliable theoretical basis for heaving floor controlling technology is provided, and the prejudgment method has great theoretical significance and practical engineering application value in ensuring the safe mining of deep resources in China and improving the safety of miningoperators.

The invention provides an experimental system and an experimental method for measuring the loss amount of gas in the process of crushing coal samples. The experimental system comprises an experiment main body device, a vacuumizing system, a pressure loading system, a gas loading system, a linear motor control system, a digital type mass flowmeter and a gas collecting system. The process of crushing a coal seam and initially desorbing gas can be simulated, and an experiment method is provided for mastering the coal seam crushing and gas initial desorption rule. The gas initial desorption rule when different coal seams are crushed under the condition of different environmental parameters can be analyzed through a large amount of experimental data, and the gas desorption quantity calculation formula is summarized. Scientific theoretical basis is provided for calculation of gas loss amount in a method for measuring the gas content of the coal seam by a direct method, the measuring accuracy of the direct method is improved, and technical guarantee is provided for safety mining of the coal.

The invention provides a comprehensive anti-outburst method of a great buried depth gently inclined coal bed area, and relates to the technical field of coal mine safety. According to the comprehensive anti-outburst method of the great buried depth gently inclined coal bed area, by firstly carrying out an anti-outburst measure on a stoping working surface machinery roadway of a great buried depth gently inclined coal bed, and then carrying out an anti-outburst measure on a stoping working surface, pumping and mining of vas on a tunneling working surface are achieved, pumping and mining of vas on the stoping working surface are also achieved, the problem that the vas exceeds the limit in a working surface mining process can be prevented, and the cost and workload in controlling the vas are sharply lowered. Besides, through anti-outburst effect verification and region verification which are conducted after the anti-outburst measure is carried out, the vas controlling effect of the anti-outburst measure is guaranteed, and safe mining of an outburst dangerous coal bed is guaranteed.

The invention provides a harmless disposal system for mine tailings. The harmless disposal system for the mine tailings comprises a dry sand preparing and tailing disposing mechanism which adopts a slurry pump to pump concentration plant full tailing mortar to a hydrocyclone to be classified and then dewaters it by a high-frequency vibration dewatering screen to make dry sand; a fine-grain high-concentration tailing concentrating mechanism which adopts a buffer tank to mix hydrocyclone overflow and the concentration plant full tailing mortar with water and enables a mixture to flow to a paste thickener for concentrating to obtain fine-grain high-concentration tailings, a filter cake preparing and tailing disposing mechanism which adopts a plate frame type filter press to perform filter-pressing dewatering on a part of the fine-grain high-concentration tailings to obtain tailing filter cakes, and a cemented tailings backfill preparing and tailing processing mechanism in which the other part of the fine-grain high-concentration tailings is taken as filling aggregate, cement is used in cooperation as a cementing material, and they are stirred in a double-shaft horizontal stirring tank and a powerful stirring barrel and then conveyed to an underground goaf through a filling pump to be subjected to fine-grain tailing cementing and filling. The method has three tailing disposal modes of dry sand preparation, filter cake preparation and cemented tailings backfill preparation, and meets the requirements of green mine construction.

The invention belongs to the field of mineral engineering, and in particular relates to a method for slowing the longwall mining pressure appearance of a shallow coal seam below a gully. In order to solve the problem of longwall mining pressure appearance abnormality of the shallow coal seam below the gully, the invention proposes that the development situation of a ground surface gully needs to be taken into consideration as an important influence factor when shallow coal seam longwall mining is performed in a gully development area. According to a propagation angle and an overburden rock breaking angle, the mining influence area of the gully is divided into an influence-free area, an influence area and a strong influence area; the determination of the position of a stop line of gully-avoiding mining and the arrangement of a working surface of gully-along mining are based on the following principles: during the gully-avoiding mining, the position of the stop line is positioned out of the strong influence area; during the gully-along mining, the boundary position, close to one side of the gully, of the working surface is in the area where the overburden rock height is more than the fissure area height. The method involves few calculation parameters, facilitates field implementation, has high safety, and can be widely applied to large-scale safe mining of the shallow coal seam below the gully.

The invention provides a mining pressure relief boundary detection method. According to the method, a transient electromagnetic method, a seismic exploration method, a numerical simulation method and a high-density electrical method are utilized in a mining stable area to obtain corresponding mining pressure relief boundaries from different parameter angles, the data of the obtained mining pressure relief boundaries are optimized in combination with the actual condition of a stope, the accuracy of determining the boundaries by all the methods is improved, and the method is suitable for popularization and application. All the mining pressure relief boundaries after data optimization are fitted, and finally the mining pressure relief boundaries are obtained. According to the method, the complexity and variability of the geological structure are considered, the determination accuracy of the mining pressure relief boundary is improved, and the mining pressure relief boundary can be accurately obtained. The method is of great significance in eliminating coal and gas outburst danger, and provides powerful guarantee for safe mining of coal mines.

The invention discloses a method for performing ascending re-mining on a hollow coal bed by a column with one completely-filled side. On the basis that the feasibility of ascending mining on a hollow coal bed is evaluated and the distribution of coal pillars and mined area in a pillar type mined area has been explored, a method by completely filling the single side of a column is carried out to protect the coal pillars in the pillar type mined area under the hollow coal bed, and thus the coal can be exploited gradually. The fillers, which are formed in the mined area and are near the columns, can protect the coal pillars and bear force together with the coal pillars, thus the stress concentration and creep deformation of the coal pillars are reduced, the stability of the coal pillars in the long term is enhanced, the local and instant disability is avoided or the domino-type destruction caused by disability is avoided, and thus the safe exploitation is guaranteed.

A broadcasting method of worked-out section hard roof by remote sensing means includes forming remote sensing network by drilling hole line with interval distance of 15-25 m near last row support at heading stope then erecting transducer and extension sets being all connected to ground host computer in return air and transportation tunnels, repeating said process when each 15-20 m of working face is pushed on, processing collected signals to be separation layer speed by host computer, issuing alarm of roof inbreak by both host computer and extension sets when separation layer valve displayed by any transducer is over threshold.

The invention provides a diffraction coefficient solving method and device and belongs to the seismic exploration and engineering geology technology field. The diffraction coefficient solving method is characterized by acquiring a diffraction wave under an attenuation function effect; combining a time window function with an attenuation function to acquire the attenuation function with the time window function; carrying out Gabor transform on the diffraction wave under the attenuation function effect to obtain the diffraction wave in a Gabor domain; and according to the diffraction wave in theGabor domain and the attenuation function with the time window function, acquiring a diffraction coefficient in the Gabor domain, converting the diffraction coefficient in the Gabor domain into the diffraction coefficient in a time domain, obtaining the diffraction coefficient of an underground tectonic geologic body in the time domain, and according to a Gabor transformation principle, solving the diffraction coefficient, and introducing the improved time window function into the attenuation function, and acquiring the high-precision diffraction coefficient. A reliable basis is provided foridentifying a microtectonic geologic body in seismic exploration and effective guarantee is provided for the safety exploitation of mineral product resources.

The invention discloses a ventilation method for exploiting short distance coal bed in a fire zone based on a positive pressure ventilation system. The method is established on the basis of the positive pressure ventilation system and comprises the following steps of: firstly, on the basis of judging connectivity between a coalface and an upper part fire zone, determining danger that harmful gas of the upper part fire zone abnormally flows into an operation face exists; determining an area with a lowest pressure energy of the operation face, namely, a safe pressure range at a position of a air returning corner; determining wind resistance from the air returning corner to an air returning air window of the coalface through ventilation parametric measurement of the coalface and a law of conservation of energy; finally calculating a differential pressure safe regulation interval of the air returning air window of the positive pressure system of the coalface; afterwards, on the basis of the differential pressure safe regulation interval of the air returning air window and combined with an automatic control technology, therefore, real-time automatic regulation control of the air returning air window and alarming by an alarm can be realized when a differential pressure before and after the air returning air window on coalface is changed and when an air pressure is changed suddenly caused by collapse of a large area of a top plate of an upper goaf, and safe exploitation on the coalface can be ultimately ensured.

The invention discloses a curtain grouting technology for an ore body roof karst fracture development and strong water-rich ore deposit. According to the technical scheme, firstly, upward exploration and injection holes are distributed, six upward exploration and injection holes with an elevation angle of five degrees, six upward exploration and injection holes with an elevation angle of 15 degrees and six upward exploration and injection holes with an elevation angle of 25 degrees are distributed in each chamber, the exploration and injection holes are designed with the chambers as base points, all the exploration and injection holes of all the lengths are evenly distributed in the plane with a stagger angle of 60 degrees, the hole depth is 50 m, and the exploration and injection holes with the elevation angle of five degrees, the exploration and injection holes with the elevation angle of 15 degrees and the exploration and injection holes with the elevation angle of 25 degrees are evenly distributed in the plane with a stagger angle of 20 degrees; secondly, downward exploration and injection holes are distributed, the outward and downward exploration and injection holes with the angles of -5 degrees,-30 degrees and -60 degrees are distributed in end chambers, the hole depth is 50 m, all the downward exploration and injection holes are evenly distributed symmetrically in the plane, and the included angle is 10 degrees; thirdly, according to the requirement of accurate mining engineering, grouting is carried out, and a grouting curtain is formed. The grouting curtain with the high water plugging rate is built under a mine according to roof karst fractures, the functions of water separation and reinforcement can be achieved, ore bodies are released safely and efficiently under the protection of the grouting curtain, and technical guarantees are provided for safe and efficient mining of the mine.

The invention discloses coal roadway tunneling equipment and a coal roadway tunneling system with a temporary uniform distribution supporting function. The coal roadway tunneling equipment comprises atunneling device and a temporary supporting device, wherein the temporary supporting device comprises a spraying device and a sealed air extractor, the spraying device is arranged on a first mechanical arm, the first mechanical arm controls the spraying device to spray a spraying material onto the surface of surrounding rock of a newly tunneled roadway to form a sealing spraying layer on the surface of the surrounding rock, the sealed air extractor is arranged on a second mechanical arm, an air extraction channel is formed in the sealed air extractor, and the second mechanical arm controls the sealed air extractor to be attached to a non-spraying position reserved on the surface of the surrounding rock by the spraying device, so that the exterior of the sealed air extractor and the sealing spraying layer are sealed mutually, the air extraction channel communicates with surrounding rock cracks, and the air extraction channel is used for extracting air in the surrounding rock cracks toenable the surrounding rock to be in a negative-pressure state. According to the equipment, the air in the surrounding rock can be extracted through the temporary supporting device, so that the surrounding rock is in a negative-pressure state to generate a temporary supporting effect on the newly-formed roadway.

The invention discloses a pressure chamber for a coal rock sample gas seepage test. The pressure chamber comprises a round steel cylinder, an annular pressure transmission sleeve, T-shaped end sockets, a PEEK sleeve, a conical steel sleeve, a right piston sleeve, a right first pressing sleeve, a right second pressing sleeve, a left first pressing sleeve and a left second pressing sleeve. A cylindrical coal rock sample cavity is formed between the annular pressure transmission sleeve and the two T-shaped end sockets; and an annular pressure applying cavity is formed between the annular pressuretransmission sleeve and the round steel cylinder. Two annular high-pressure liquid connectors are arranged on the side wall of the round steel cylinder; two axial high-pressure liquid connectors arearranged on the side wall of the right second pressing sleeve; and each of the two T-shaped end sockets is provided with a seepage high-pressure gas and resistivity tester PEEK insulation connector sharing connector. Therefore, the gas seepage conditions of the coal rock sample under underground real conditions of different pressures, different temperatures, underground waves and the like can be simulated truly, so that the test result has the higher practical guiding significance and the reliable guarantee is provided for safe mining of coal rock strata.

The invention provides an underground goaf filling material and a preparation method and application thereof, and belongs to the technical field of goaf filling. The underground goaf filling material provided by the invention is prepared from raw materials including fly ash, desulfurized gypsum, cement and water, the mass ratio of the fly ash to the desulfurized gypsum to the cement is (2-6):(2-6):1, and the total mass of the fly ash, the desulfurized gypsum and the cement accounts for 55-75% of the mass of the goaf filling material. The underground goaf filling material is prepared from the two industrial solid wastes, namely the fly ash and the desulfurized gypsum, matched with the cement and the water, so that the strength required by underground mining filling bodies can be met, potential safety hazards of underground goaf are eliminated, safe mining of mines is guaranteed, meanwhile, recycling treatment of the industrial solid wastes can be realized, the cement consumption is reduced, and economic benefits and social benefits of mine enterprises are improved.