330 results about "Groundwater resources" patented technology

The invention relates to a subsurface flow simulating and predictive analysis method which comprises the following steps of: dynamically observing and collecting groundwater date of a mining area, integrating the groundwater data into a graphic workstation by utilizing a data engine, automatically establishing a finite element mesh model of the dynamic water level of each water layer, and determining parameter partitions and corresponding parameter values so as to realize the dynamic analog of water level of the water layer and the simulation of groundwater migration; and carrying out the simulation of a groundwater seepage field and the dynamic and real-time simulation of aquifer in designed software and hardware environments, and carrying out interactive analysis, prediction and evaluation on various models in the VR environment and the WEB environment by using tools such as interactive operation, information inquiry, and the like. The method can provide the scientific basis of reasonably developing and utilizing water resources for the future development and the evolution tendency of groundwater resources, and achieves low overall cost, easy popularization and use as well as flexible and reliable operation.

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.

A skid-mounted refueling device which is safe, environment-friendly and energy-saving is a safe and explosion-proof automobile refueling device capable of fixing on the ground or moving. The device comprises a blocking explosion-proof oil tank and a split-type oiling machine; the blocking explosion-proof oil tank is a double-wall tank, the interlayers of the tank and the double-wall tank are respectively filled with the blocking explosion-proof material. The tank is positioned on the skid body, and an outer cover is arranged on the skid body. A numeral electronic display and two oil guns of the split-type oiling machine are arranged on the outer cover wall; an oil pump casing body is arranged on the skid body in the cover. Improved by the blocking explosion-proof technology, the device ensures safety and explosion-proof; the device depresses the volatilization of oil gas, reduces the air pollution, effectively prevents oil and gas in the tank from seeping or leaking and protects the groundwater resource; the device has small occupied area, whole moving, short station construction period, rapidness, high efficiency and cover pattern diversity, achieves the integral coordination with the environment and becomes a scenery line of the urban architecture.

The invention discloses a water-preserved mining method, which comprises the following steps of: performing geological survey in a mining region to obtain geological parameters; calculating water-preserved mining condition parameters according to the geological parameters; calculating underground water distribution trend data according to the geological parameters; determining the mining sequence of each block in the mining region according to the water-preserved mining condition parameters and the underground water distribution trend data; and determining the mining sequence of each working surface in each block according to the water-preserved mining condition parameters and the underground water distribution trend data. Due to the adoption of the water-preserved mining method disclosed by the invention, the geological and hydrogeological conditions of the mining region can be accurately explored, and the situations of coal thickness variation, an overlying rock structure and the like are comprehended; and different mining ways and mining parameters are adopted specific to different geological conditions, so that the influences of coal mining on underground water resources and the ecological environment are reduced.

The invention discloses a plant planting soil moisture preservation water-saving fast growing method, which is mainly characterized in that an anti-seeping layer, an anti- evaporation layer and a water storage soil moisture preservation layer are developed and additionally arranged in tree planting and seeding processes; alluvial soil, aeolian sandy soil, picked open-pit mine abandoned soil, straws, weed, plant branches and leaves, sawdust, vinasse, medicine slag and rice hulls are used; the processes of screening, thorough decomposing, fermentation and proportional and uniform mixing are performed; the materials are processed to be made into microbial nutritional planting soil with the organic matter content reaching 45 percent to 60 percent; the microbial nutritional planting soil can improve and optimize the soil; the soil aggregate structure and the moisture-holding capacity are increased; moisture seepage can be prevented by the plant anti-seeping layer; moisture is prevented from being diffused to the bottom and peripheral soil; the plant anti-evaporation layer can avoid the sunlight direct irradiation; the evaporation quantity of the soil moisture in a ditch and a pit can be reduced. The method has the advantages that rain and snow resources can be gathered for use; the underground water resource is saved; the planting survival rate can be improved; the tree seedling canopy closing forest forming period is shortened; the ecological construction quality is comprehensively improved.

The invention relates to a comprehensive treatment utilization technology for municipal domestic waste, which belongs to the technical field of treating and recycling municipal waste; the technology is as follows: the municipal waste is transported to a waste treatment plant so as to carry out harmless treatment, then is classified into eight kinds, that is, the municipal domestic waste, medical waste, branches and straws, floater on water surface, construction waste, aquatic plant, urban night soil and market waste, and is transported to a department belonging to one kind so as to be treated and recycled. The technology of the invention solves the problems of occupying a lot of lands, and polluting environment and groundwater resources caused by the landfill mode which is adopted to treat the municipal waste for a long time, solves the problems in municipal solid waste incineration that dioxin, a carcinogenesis gas, is released into air and 40 percent of waste residues still need to be land-filled, so that lands still needs to be occupied; therefore, the technology can change the municipal waste into valuables, recycle natural resources, give full play to the value of resource recycling, and realize the measures advocated by the country such as 'waste reduction', 'resource recycling' and 'harmlessness', thus being suitable for waste treatment in different cities.

The invention discloses a construction method for a sponge urban green land water storage system. The construction method comprises the following steps: (a) building a foundation pit; (b) embedding an impounding reservoir; (c) putting ground water storage in place; (d) embedding a negative well; (e) paving bricks; and (f) performing greening. The construction method provided by the invention is simple in construction, low in difficulty and ordered in construction, the construction quality is easy to control, less construction equipment is involved, the construction cost is low, the infiltration effect is good, the urban drainage pressure is relieved, the amount of groundwater resources is increased, the amount of urban rainfall flood is reduced, and an urban environment is improved.

The invention provides a ground-and-air nuclear magnetic resonance underground water detecting system and a ground-and-air nuclear magnetic resonance underground water detecting method. The system comprises two grounding electrodes which are connected with a transmitter through transmitting lead. The transmitter is controlled through a ground master control system. The transmitter transmits excitation current with frequency of local Larmor frequency to ground through changing emission current of the grounding electrodes. A receiving coil which is loaded on an aerial vehicle acquires a nuclear magnetic resonance signal which is generated by magnetic moment precession. The ground master control system performs remote controlling on transmission and stoppage of the excitation current through a communication module. The ground master control system makes a receiver which is connected with the receiving coil acquire the nuclear magnetic resonance signal in a gap when the excitation current is stopped through the communication module. The acquired nuclear magnetic resonance signal is transmitted to an upper computer through the communication module. The ground-and-air nuclear magnetic resonance underground water detecting system and the ground-and-air nuclear magnetic resonance underground water detecting method has advantages of large ground transmitting and detecting depth, high resolution, wide air receiving and detecting range, high detecting speed and effective underground water resource detecting range.

The invention relates to a purification method of a coal mine distribution underground reservoir water resource. The purification method includes the following steps: (1) separate collection of mine water; (2) filtering and purification of the distribution underground water resource; and (3) circulation filtering and purification of a distribution underground reservoir. The purification method has significant meaning for protection of the underground water resource and can achieve great economical benefit and social benefit. In the aspect of space, the distribution underground reservoir can be formed preliminarily through resource exploiting, water is not required to be sucked out during a coal mining process, coal mining energy consumption is reduced, and water retention mining is achieved. In the aspect of time, even deployment of water utilization can be achieved, and the problem that water utilization is difficult and unbalanced in a mine lot is solved.

The invention provides a detection method of a stope bottom rock stratum of an open coal mine. The method includes the following steps: conducting geophysical prospecting on the stope bottom rock stratum to obtain distribution and thickness of a water-resisting stratum and a water-bearing stratum and preliminary data of fault distribution and fault throw, conducting drilling prospecting on the water-resisting stratum, the water-bearing stratum and a fault according to the preliminary data of the geophysical prospecting, conducting preliminary site selection on a reservoir according to accurate data of distribution and thickness of the water-resisting stratum and the water-bearing stratum and preliminary data of fault distribution and fault throw which are obtained by the drilling prospecting process, sampling the rock stratum of the reservoir preliminarily selected to obtain permeability coefficient and permeable rate of rock stratum samples and determining the site of the reservoir according to the permeability coefficient and the permeable rate. The method preliminarily selects the site of the reservoir by the geophysical prospecting and the drilling prospecting, analyzes the rock stratum samples to obtain the permeability coefficient and the permeable rate of the rock stratum and finally selects the optimum reservoir with optimum impermeable performance according to the permeability coefficient and the permeable rate. Therefore, the underground reservoir can be reasonably utilized, and underground water resources can be protected.

The invention relates to a construction method of a high-pressure swing grouting water-stop curtain, belonging to the method of building construction. The method comprises the following steps of: staking out in survey, positioning a drilling rig, installing and locating the drilling rig, boring, treating an orifice and grouting. The grouting process comprises the following steps of: a. trying to spray a ground; b. injecting to a spraying tool; c. stirring cement slurry; d. injecting air and water at high pressure and grouting at low pressure; e. completing grouting; and f. cleaning. The construction method has the characteristics of wide application range, convenience for getting materials, simplicity and convenience for construction operation, higher construction speed, reliable construction quality and economy and reasonability. The construction method of the high-pressure swing grouting water-stop curtain can better prevent ground water from entering a construction region, reduce the waste and the pollution of ground water resources to the maximum degree, protect ground water resources, maintain the balance of the ground water resources, ensure the safety of peripheral buildings and structures and meet the requirement for green construction.

This invention relates to a device in hydraulic engineering groundwater extraction, especially a spontaneity underground reservoir of water corridor. There is vertical well in sand stone. Collecting tunnel and diversion tunnel located in the groundwater below the water makes the vertical wells connect from one another. The direction of diversion tunnel is the same to the terrain slope. The diversion tunnel makes the water of vertical well out of the ground. This invention can replace small river valley emerges surface reservoir functions, storing basin of water, so that the groundwater basin rational allocate its resources, its quantity, water wide range of low-cost water, reducing water evaporation. This invention can directly get water in deep coverage river bed, and is appropriate to get water in mountain underground water reservoir.

The invention relates to the electrified railway technology, in particular to a subway station water blocking structure for protecting the underground water environment and a construction method of the subway station water blocking structure. The water blocking structure comprises a V-shaped frozen earth water blocking layer, wherein two vertical frozen earth walls are arranged in the space defined by the V-shaped frozen earth water blocking layer, and the vertical frozen earth walls are communicated with the V-shaped frozen earth water blocking layer. By means of the V-shaped frozen earth water blocking layer, external underground water is prevented from entering a station foundation pit; the vertical frozen earth walls are used for supporting the stability of soil bodies on the two sides of the station foundation pit, protecting the underground water environment and preventing the underground water from being polluted in the construction process. By means of the freezing water blocking structure, large-scale drainage construction is avoided, precious underground water resources are saved, and settlement deformation, caused by drainage construction, of nearby buildings and structures are avoided.

The invention provides a grouting treatment method for a broken water-rich section of a diversion tunnel in a karst area. The method includes the following steps: S1) conducting geological explorationon the broken water-rich section of surrounding rock with water inrush to determine a major runoff path of fissure water and / or groundwater; S2) drilling a drainage hole from a tunnel wall of the broken water-rich section of the surrounding rock to the runoff direction of the fissure water and / or the groundwater in the surrounding rock for drainage of the fissure water and / or the groundwater; S3)drilling grouting holes at preset distance along the radial and circumferential directions of the tunnel wall of the broken water-rick section of the surrounding rock and inserting a grouting pipe into each grouting hole; S4) injecting grouting liquid into the surrounding rock through the drainage hole and the grouting pipes to form a water stop curtain circumferentially in the surrounding rock of the tunnel wall. According to the method, a better grouting treatment effect is achieved, the engineering safety is ensured, and the groundwater resource pollution is reduced.

The invention discloses a method for regulating and controlling an underground water resource of a coal mining region. The method comprises the following steps: S001: acquiring geological and hydrologic foundation data in the mining region by a system; S002: determining a protection region needing to protect underground water and a gathering region for gathering the underground water in a water-containing layer, and determining the position of an underground reservoir; S003: controlling the underground water in the water-containing layer to permeate into the underground reservoir through adopting a manner of separating the water-containing layer in the protection region and communicating the water-containing layer and a water guide fissure zone located below the water-containing layer in the gathering region. By separating and protecting the water-containing layer and guiding the underground water to be gathered, the effect of loosening soil through mining can be effectively utilized and a collection capability of atmospheric precipitation is improved; the underground water is guided and is gathered and permeated into the underground reservoir region and a water resource supply amount of the underground reservoir is improved.

The invention relates to an anti-seepage method for mine underground reservoirs. The anti-seepage method is used for solving the problem of seepage of underground reservoirs and includes performing anti-seepage treatment for roadway lateral walls and retracement passages of an underground reservoir composed of working surfaces, so that anti-seepage effect is achieved, and groundwater resources in mining areas are effectively protected. Anti-seepage engineering and coal mining are carried out synchronously, so that safety and stability of the underground reservoirs are enhanced while engineering progress is accelerated, influences on mine production are avoided, and optimized development of water protection and resource exploitation is achieved.

The invention discloses a method of determining water-preserved mining geological conditions under a loose water bearing layer. The method comprises the following steps of: carrying out geological reconnaissance on a mining area so as to obtain geological parameters, wherein the geological parameters comprise pressure of the water bearing layer; figuring up the thickness of an effective protecting layer of a top plate of a coal layer according to the geological parameters; figuring up a water-preserved danger coefficient according to the thickness of the effective protecting layer and the pressure of the water bearing layer; and determining the water-preserved mining geological conditions according to the lithological character and the structure of the effective protecting layer, the thickness of the effective protecting layer and the water-preserved danger coefficient. According to the invention, the geological conditions of the mining area are prospected, the migration trend of underground water is predicated, the resource recovery rate and the water resource protection are optimized, and a scientific and reasonable technical method is provided for protecting the underground water resource of the mining area.

The invention relates to an underground construction technology, and specifically relates to an open-excavated tunnel water stopping structure for protecting a groundwater environment and a construction method thereof. The open-excavated tunnel water stopping structure comprises vertical frozen earth water stopping layers arranged at two sides of an open-excavated foundation pit of a tunnel, and a horizontal frozen earth water stopping layer arranged at the bottom part of the open-excavated foundation pit of the tunnel, wherein the vertical frozen earth water stopping layers intersect with the horizontal frozen earth water stopping layer; the bottom parts of the vertical frozen earth water stopping layers are lower than the bottom part of the horizontal frozen earth water stopping layer. According to the open-excavated tunnel water stopping structure, the vertical frozen earth water stopping layers and the horizontal frozen water stopping layer form a U-trough shaped frozen earth water stopping layer to protect the groundwater environment, and thus the groundwater can be prevented from being polluted during the tunnel construction process; a frozen earth water stopping structure is adopted, so that wide-range draining construction can be avoided, and precious groundwater resources can be saved; meanwhile, surrounding buildings and structures can be prevented from being subjected to sedimentation and deformation caused by the draining construction.

The invention discloses a ground source heat pump air-conditioning system and a fresh air processing method thereof. The ground source heat pump air-conditioning system comprises a ground source heat pump unit, a ground source heat exchanger, a fresh air unit, a radiant heating ground coil and a cold radiant ceiling device. One outlet end of the ground source heat exchanger is connected to the cold radiant ceiling device controlled by a valve opened in summer and closed in winter, while the other outlet end is connected to a first heat calorie exchanging device. Both the outlet ends are connected to an outer heat exchanger of the ground source heat pump unit. An outlet of the outer heat exchanger is connected to an inlet of the ground source heat exchanger through a first circulating pump. An outlet end of the inner heat exchanger of the ground source heat pump unit is divided into two paths, wherein one path is connected to the radiant heating ground coil controlled by a valve opened in summer and closed in winter, and the other path is connected to a second heat calorie exchanging device. Both the paths are connected to an inner heat exchanger of the ground source heat pump unit. The ground source heat pump air-conditioning system has obvious energy-saving effect and stable and reliable operation of the system, is sanitary, does not pollute the underground water and has wide application prospect in the regions which are rich in underground water and are cold in winter and hot in summer.

The present invention provides a safe and environmental protection type underground oil tank which has a tank body of two-layer structure composed of an inner tank wall and an outer tank wall; an interlayer formed between the inner tank wall and the outer tank wall; the separating explosion-proof materials respectively filled in the cavity of tank body and the interlayer formed between the two-layer tank walls; an oil leak detection device provided in the interlayer between the two-layer tank walls; as well as an oil spill pool established on the manhole cover of the tank body, the bottom of the oil spill pool being connected with the interlayer between the two-layer tank walls. Since the separating explosion-proof materials are provided in the oil tank, it is possible to prevent the accidental combustion and explosion accidents initiated by naked fire, static electricity, welding, gunshot, collision and misoperation, and thus ensure the intrinsic safety of oil tank. With the double walled tank structure, the oil tank may effectively overcome the leakage and / or leak of oil and gas and thus avoid serious damages to the soil around the gasoline filling station and destruction of underground water resources. At the same time, an oil leak detection device is provided in the cavity of the double walled tank, so that it is possible to detect the volatilization of oil and gas in time and thus make repairing welding the tank wall in case of charged oil. An oil spill pool is provided on the manhole of the tank body, so that it is possible to prevent such phenomena as oil spill and ebullition in the process of the oil filling and to adopt the countermeasures in time upon detection of such phenomena.

The invention belongs to the technical field of constructional engineering, and particularly relates to a novel totally-closed water stopping system for a water-rich stratum foundation pit and a construction method of the novel totally-closed water stopping system. According to a totally-closed water stopping technique, a suspended water-stopping curtain is adopted as the lateral wall of the foundation pit; a horizontally sealed artificial water-resisting layer is adopted as the bottom of the foundation pit; the totally-closed water stopping system is formed by the suspended water-stopping curtain on the lateral wall and the horizontally sealed artificial water-resisting layer; no hydraulic connection is formed between the underground water within the range of the foundation pit and the underground water out of the pit; and the underground water in the foundation pit becomes static water. A totally-closed foundation pit with an excellent structure is provided by reasonably setting various construction parameters and various structure parameters; the construction method is simple; shortage of underground water resources due to the fact that the underground water resources are destroyed by a large amount of rainfall inside and outside the foundation pit when no a water-resisting layer foundation pit is constructed at the bottom of the foundation pit in a water-rich area at present is solved; the underwater resources are protected; and the novel totally-closed water stopping system has relatively important significance in spring water protection of the spring city.

The comprehensive desert tackling method includes the steps of spreading artificial lawn over desert; utilizing positioning nails to fix the artificial lawn; cutting planting hole in the artificial lawn; filling soil in the planting hole and planting; and spreading coarse sand on the artificial lawn. The said method can utilize the precious underground water resource in desert and tackles desert directly from fixing sand, maintaining water and greening. The present invention may be used in both tackling desert and preventing soil desertification and has the advantages of fast effect and short period.

The invention belongs to the technical field of waterstop and waterproof building materials, and discloses a non-asphaltic high polymer self-adhesive waterstop strip and a preparation technology thereof. The waterstop strip is mainly characterized in that the waterstop strip comprises a waterstop strip substrate, wherein ribs, waterstop areas and a deformation area are arranged on the waterstop strip substrate; the waterstop areas are hot applied with non-asphaltic high polymer self-adhesive glue; the non-asphaltic high polymer self-adhesive glue is covered with isolating films; and the non-asphaltic self-adhesive glue comprises SBS (styrene butadiene styrene) resin, SIS (styrene isoprene styrene) resin, a plasticizer (naphthenic oil), a tackifier (small molecular polyisobutene), a light absorber (titanium dioxide) and packing (calcium carbonate). The components of the non-asphaltic high polymer self-adhesive glue do not include volatile oily substances, so that adhesive stability is improved greatly, and the service life is prolonged; in addition, the raw materials of the non-asphaltic high polymer self-adhesive glue are high polymer materials and do not include hazardous substances easy to precipitate in water, so that risks of polluting and damaging underground water resources are decreased.

The invention discloses an upward layered wall type bag filling mining method. A stope face is advanced in the side direction in a mining field, after ore removal is finished, an enclosure is formed along the overall length of a working face at the position a certain distance away from the stope face, a gob is separated into a reserved dead zone close to the stope face and an isolating dead zone far away from the stope face, bag filling is carried out in the isolating dead zone, roof contact is achieved, and after filling bodies are solidified, a next circulating mining process is carried out. During the next circulating mining process, the reserved dead zone serves as an explosion free face to be exploded, and stope filling is carried out according to the above steps. By means of the upward layered wall type bag filling mining method, the gob is treated with a bag filling method, ground pressure is controlled to create a working face for stope, and safe stope is achieved; operations are carried out in a small exposed space, and mining operation is continuous and high in efficiency; pillars are not needed, the resource recovery rate is high, and loss and dilution are small; the roof of the mining field can be effectively controlled, surface subsidence is avoided, water guiding fractures in the upper portion of the mining field are avoided, and groundwater resources and the ecological environment are protected.

The invention relates to a ceramic ecological brick produced by solid waste, and belongs to the solid waste utilizing and new material field. The product is made by using the graphite gangue as the main material and adding wedding agent with a certain rate and utilizes the heat energy generated by the burning of the flammable solid waste to realize the burning of the products. The invention solves the pollution problems of the solid waste and reduces the cost of the ceramic ecological brick by utilizing the solid waste to produce the ceramic ecological brick. The solid waste ceramic ecological brick has good permeability of water and can prevent the road seeper and improve the growth of the ground surface plant. With good moisture retention, the invention is useful for adjusting the temperature and the humidity of the city ground surface, reducing the thermal conductance and having significant meaning to the adjustment of the city atmosphere, the protection of the underground water material and the city environment.

The invention provides an agricultural underground water management and control system, a manufacturing method and an agricultural underground water management and control method. The system is composed of an agricultural water management and control center, water sale mechanisms and farm irrigation machine rooms. The agricultural water management and control center is built according to an agricultural irrigation plan of one region and used for managing and controlling the whole underground water resources of one region, only one water sale mechanism is arranged for every administrative village, the farm irrigation machine rooms are built according to the agricultural irrigation plan of one region, are set according to the farm irrigation area and are connected with the agricultural underground water management and control center through GPRS communication antennas. Each farm irrigation machine room is composed of a water resource controller, a distribution board, the GPRS communication antenna, a flow meter, an exhaust valve, a check valve, a submerged pump, an underground water source well, a water taking pipeline, a water conveying pipeline, a water level sensor, a soil moisture sensor and a rainfall sensor. The agricultural underground water management and control system is scientific in design, reasonable in structure, low in cost and easy to manufacture, water resources are saved, land subsidence is inhibited, the ecological environment is improved, the ability to withstand natural disasters is improved for the agriculture, and the agriculture comprehensive production capacity is improved.

The invention discloses a microbial insecticide composition for control of solenopsis invicta. The microbial insecticide composition consists of beauveria bassiana and thiacloprid, the number of beauveria bassiana spore and the gram of thiacloprid are in a ratio of (8-1)*20 billion:2-9g. Test finds that compounding of beauveria bassiana and thiacloprid has an obvious synergistic effect, can achieve very good control effect, has the advantages of high efficiency and rapidity on solenopsis invicta, is non-toxic to human and livestock, has no pollution to soil and groundwater resources, and is very safe. Therefore, the insecticidal effect of beauveria bassiana is improved, also reinforcement of solenopsis invicta drug resistance is delayed, the dosage of chemical pesticide thiacloprid is reduced, and environmental pollution is reduced, thereby improving the control effect, reducing the dosage of effective ingredients, saving cost and delaying the generation of pest resistance to insecticides.

An underground water resource monitoring and management system is described. The station is a complete hydrological and weather station and / or network capable of measuring, analyzing, storing and / or transmitting hundreds of parameters, such as but not limited to, quality and / or quantity of water and surroundings, and weather factors (e.g., rain, wind, etc), or any combination thereof.

The invention discloses a water retaining method for a coal mining process, relating to the technical field of an underground mining method. The water retaining method comprises the following steps: firstly, performing three-dimensional probing on underground water static occurrence features, protective layer integrity and natural water diversion channel development state of an underground coal mine excavating region by adopting the three-dimensional probing technique; and secondly, finding a weak section and a water diversion channel in an underground water protective layer and a section with underground water leakage risk by combining the probed result, and rapidly grouting to block the water diversion channel and the section with the underground water leakage risk by drilling rapidly and accurately and grouting to reinforce the underground water protective layer or setting up a water retention coal pillar by adopting underground high-pressure water jet drilling technology. The method can realize protection to groundwater resources in mining districts while ensuring safe and high-efficiency coal mining.

A water-permeable moisture-preserving brick for pavement is made up of granular aggregate and high-plasticity clay powder through proportionally mixing, adding water, die pressing and calcining at 1100-1250 deg.C.