30results about How to "Reduce seepage" patented technology

Provided are a slant grouting control steel anchor pipe frame and a construction method thereof. A primary grouting body is poured to the peripheral space of a steel anchor pipe through a primary grouting pipe; after the primary grouting body is solidified, a secondary grouting body is poured to the outside through a secondary grouting hole in the steel anchor pipe wall in a compression mode, the secondary grouting body splits the primary grouting body through the secondary grouting hole and is diffused to a peripheral rock and earth mass and forms a mixed grouting body with the primary grouting body. A concrete beam is poured along a slope to wrap the top of the steel anchor pipe in the beam. The slant grouting control steel anchor pipe frame combines the advantages of an anchor rod frame and a grouting control technology, the steel anchor pipe is used as a protection measure and a secondary grouting channel, and by means of improvement of the strength of the peripheral rock and earth mass through the secondary grouting, a steel pipe and the peripheral rock and earth mass form a whole body to defend a slope together. A slant grouting control steel anchor pipe frame structure has the advantages of being advanced in technology, reasonable in economy, fast in construction and the like and is a novel slope reinforcing technology with good developing prospects.

A drilling fluid additive comprised of ground canola meal that decreases seepage loss and fluid loss of the fluid to permeable formations. The canola meal is ground to particle sizes between about 10 and 1250 microns, in particular, between about 100 to 1000 microns. This product can be added to oil or water based drilling fluids. It is environmentally safe, reduces torque and drag on a drill string, and provides viscosity in the system. The additive has a high return permeability and acid degradability.

The invention discloses a tunnel portal section pre-reinforcement and excavation construction method based on partition blasting. The construction method comprises the following steps of 1, precipitation pre-reinforcement; 2, earth surface pre-reinforcement, and specifically, reinforcing the surface of a backfill section in a construction tunnel portal section through adopting a cement soil stirring pile; and 3, tunnel excavation construction, and specifically, carrying out excavation construction from rear to front in a plurality of excavation sections, wherein the process comprises the following steps of surveying and setting out, performing drilling and blasting construction, excavating an upper portal body, excavating a middle portal body and excavating a lower portal body. The construction method is reasonable in design, simple and convenient in construction and good in use effect; the underground water level is reduced through precipitation pre-reinforcement, and then surroundingrock is effectively reinforced; after the backfill section is subjected to surface pre-reinforcement through using the cement soil stirring pile, a three-step synchronous excavation mode is used forcarrying out partition blasting excavation, so that it is ensured that the tunnel excavation process is safe and reliable and a tunnel structure is stable.

The invention discloses a drill hole fluid sealing method for coal mine gas extraction. A water injection pipe is installed in an extraction pipe and is provided with a closed branch pipe penetrating through the extraction pipe and a one-way valve, a plug is installed on the surface of the extraction pipe and located on two sides of the one-way valve respectively, the water injection pipe is provided with a pressure gauge and a main valve, and an inner cavity is filled with a sealing fluid. The extraction pipe is put in a drill hole, the valve is turned on for water injection, and when pressure rises to reach a certain pressure, the main valve is closed. The water injection pipe is connected with a lower-pressure water source, water flow slow-seeping seal is continuously conducted on the drill hole, and gas extraction concentration data is observed every day. The drill hole fluid sealing method uses a cementitious viscous fluid and water as hole sealing materials to replace traditional solids based on 'solid seals colloid, colloid seals liquid and liquid seals gas', the compactness of a hole sealing section is effectively improved, and the purpose of improving a hole sealing effect is achieved.

The invention provides a heavy curtain and water curtain combined goaf gas storage cave depot designing method. The heavy curtain and water curtain combined goaf gas storage cave depot designing method comprises the following steps that S1, an underground gas storage depot area for storing natural gas is designated according to the mining data and geological survey data of a mine; S2, multiple roadways are arranged above the underground gas storage depot area; and S3, multiple grouting holes and multiple water curtain holes are drilled in the roadways towards surrounding rock, water and groutare injected into the surrounding rock through the water curtain holes and the grouting holes to form a water curtain and a heavy curtain, and the underground gas storage depot area is sealed. According to the heavy curtain and water curtain combined goaf gas storage cave depot designing method, heavy curtain and water curtain systems are built, grouting is carried out to reinforce the surroundingrock, and holes and cracks are filled to reduce the seepage flow and seepage pressure; and the water curtain system is formed by the water curtain holes, the natural gas storage area is reinforced and sealed, natural gas is prevented from diffusing and leaking around, and the underground gas storages safety of the mine is ensured.

A seawall structure for marine soft soil and industrial solid waste resource recycling comprises a medium-coarse sand quilt, a pocketed sand quilt, a first non-woven geotextile layer, a first pocketedsolidify soil layer, a rheid row protecting bottom, a second pocketed solidify soil layer, a bottom protection stone layer, a second non-woven geotextile layer, a face protection cushion layer, a face protector, a concrete layer and a slit layer. The solidified soil is cured by marine soft soil and industrial solid waste. According to the composite seawall structure, the stability and wave resistance function of the dyke body can be efficiently improved. The solidified soil of marine soft soil and industrial solid waste is used as the material of the sand quilt dyke breakwater core, thereforethe dyke body can be impervious to water, the inverted filter construction and large riprap is unnecessary, the cost is saved, the inertial flow is reduced, and the stability of the dyke body is improved. Moreover, by using these useless marine soft soil and industrial solid waste materials, usable construction material is processed, waste material can be turned into wealth, and the environment can be protected, and mean while the economic benefits can be created.

The invention discloses a side slope ecological restoration method based on coal gangue hydrophobic slope protection bricks, and belongs to the field of environment-friendly building materials. Reinforcement treatment is conducted, specifically, concrete lattices are arranged on the slope edge, and pre-stressed anchor cables are stabilized in the lattices; slope protection bricks are laid, specifically, the slope protection bricks with the hollowed-out middles are laid on the side slope; the slope protection brick is prepared from the following raw materials in percentage by mass: 40-70% of coal gangue, 12-42% of natural sand, 5.14% of fly ash and 12.86% of cement. Hydrophobic treatment is conducted, specifically, waterproof paint is sprayed to the paved slope protection bricks; plants are planted, wherein vegetation is planted in the hollowed-out structures of the slope protection bricks; when the coal gangue slope protection brick is used for building a slope surface, water flows down along the drainage channel and cannot stay on the surface of a slope body, and seepage of the water and scouring of rainwater to the surface of the slope body are reduced; the contact angle between the surface of the slope protection brick sprayed with the waterproof material and water is enlarged, a hydrophobic state is formed, and water insulation and drainage of the slope are guaranteed.

The invention discloses a suction bucket foundation with an anti-pull steel pipe pile and a mounting method thereof. The suction bucket foundation comprises a bucket body and an anti-pull pile mechanism. The bucket body is of a bucket-shaped structure with an open bottom and a sealed top, and an inner bin is formed in the bucket body. The bucket body comprises an inner bucket wall and an outer bucket wall, and a hollow interlayer is formed between the inner bucket wall and the outer bucket wall. The anti-pull pile mechanism is arranged in the hollow interlayer and can vertically slide along the hollow interlayer. The anti-pull pile mechanism comprises a base and the anti-pull steel pipe pile. The use method comprises the following steps that (1) the bucket body sinks due to the dead weight; (2) water is extracted out of the inner bin, and the bucket body continues to sink; (3) the anti-pull steel pipe pile stretches out of the hollow interlayer and penetrates into a seabed; and (4) high-pressure water in the hollow interlayer is drained to underwater grouting liquid to fill the hollow interlayer, and after the underwater grouting liquid is solidified, the steel pipe pile and the bucket body form a whole. According to the suction bucket foundation with the anti-pull steel pipe pile and the mounting method thereof, the anti-pull steel pipe pile can penetrate into the seabed, theanti-pull bearing capacity of the suction bucket foundation is improved, and the problems of soil blocking and material waste caused by bucket length increase and bearing capacity improving are solved.

The invention relates to a building curtain wall structure, in particular to a green environment-friendly building curtain wall structure. The green environment-friendly building curtain wall structure comprises a building body, wherein side baffles are respectively fixed to the side edges of a roof of the building body, the side baffles at the side edges are connected end to end in sequence so as to define a water collecting pool, a support plate set is arranged in the water collecting pool, a soil covering plate is in lap joint with the support plate set, a plurality of water falling holes are formed in the soil covering plate, a planting soil layer is laid on the soil covering plate, green plants are planted on the planting soil layer, water absorption cotton threads are buried in the planting soil layer, the water absorption cotton threads penetrate through the soil covering plate and then are stacked in the water collecting pool, a plurality of water diversion pipes are connected to each side baffle, and the water diversion pipes penetrate through the building body and is connected with a water supply pipeline in the building body. According to the green environment-friendly building curtain wall structure, the recycling of rainwater is achieved.

The invention provides a pump station foundation pit integrated drainage system. The system is characterized in that a circle of cement soil seepage interception wall is arranged outwards at intervals along the outer side line of a foundation pit to form a closed seepage interception wall body, the cement soil seepage interception wall penetrates through a permeable layer, and the bottom of the cement soil seepage interception wall extends to the position 2 m below a relative impervious layer; on the outer side of the foundation pit with the closed space formed by the cement soil seepage interception wall, a circle of out-pit pressure reduction wells is constructed outwards along the cement soil seepage interception wall, and the bottom elevation of the pressure reduction wells is located at the bottom elevation of the permeable layer; an in-pit drainage well is constructed in the foundation pit, and the bottom elevation of the drainage well is located at the bottom elevation of the permeable layer; and the pump station foundation pit integrated drainage system is jointly formed by the cement soil seepage interception walls, the out-pit pressure reduction wells and the pit interior drainage well, a closed seepage interception wall is formed by the cement soil seepage interception walls, the underground water level in a foundation pit is reduced to be 0.5 m or below of a design base through the drainage drainage well, and the water head difference between the interior and the exterior of the foundation pit is kept within the range of 7 m through the drainage pressure reduction well. The dewatering and drainage requirements of the foundation pit of the large pump station can be met, and dry land construction conditions are created.

The invention discloses a suction bucket foundation with uplift-resistant steel pipe piles and an installation method thereof, comprising a bucket body and an uplift-resistant pile mechanism. The body includes the inner barrel wall and the outer barrel wall. A hollow interlayer is formed between the inner barrel wall and the outer barrel wall. The uplift pile mechanism is arranged in the hollow interlayer and can slide up and down along the hollow interlayer. The uplift pile mechanism includes a base and an uplift steel pipe pile. ;The method of use is as follows: (1) the barrel body sinks under its own weight; (2) the inner cabin pumps water to make the barrel body continue to sink; (3) makes the pullout-resistant steel pipe pile protrude from the middle interlayer and penetrates into the seabed; (4) The high-pressure water in the hollow interlayer is discharged until the underwater grouting fluid fills the hollow interlayer, and the steel pipe pile and the bucket body are integrated after the underwater grouting fluid is solidified; the invention can penetrate the seabed through the anti-pull steel pipe pile and improve the resistance of the suction bucket foundation. Increase the bearing capacity, and solve the problem of soil plug and material waste caused by deepening the barrel length to increase the bearing capacity.

The invention provides an air-permeable sap coating composite material for preventing slope infiltration and a manufacturing method thereof. The sap-coated composite material is composed of a sap-coated honeycomb grid, a three-dimensional separation layer, and a reinforced permeable layer. The sap coating composite material is used in the surface waterproofing project of slope embankment filling, especially suitable for slope embankment filling projects in areas with a lot of rain in the south, which can significantly reduce or eliminate the infiltration of seepage rainwater on the slope embankment Destruction, speed up the discharge of rainwater from the surface of the slope embankment, reduce the downward seepage along the slope, and avoid soil seepage damage. In fine weather, the sap coating composite material can also shrink and open the honeycomb ventilation holes to discharge the rainwater in the slope embankment Excess moisture. At the same time, the sap coating composite material can also improve the anti-skid performance of the slope soil and reduce the risk of landslides.

A seawall structure for marine soft soil and industrial solid waste resource recycling comprises a medium-coarse sand quilt, a pocketed sand quilt, a first non-woven geotextile layer, a first pocketedsolidify soil layer, a rheid row protecting bottom, a second pocketed solidify soil layer, a bottom protection stone layer, a second non-woven geotextile layer, a face protection cushion layer, a face protector, a concrete layer and a slit layer. The solidified soil is cured by marine soft soil and industrial solid waste. According to the composite seawall structure, the stability and wave resistance function of the dyke body can be efficiently improved. The solidified soil of marine soft soil and industrial solid waste is used as the material of the sand quilt dyke breakwater core, thereforethe dyke body can be impervious to water, the inverted filter construction and large riprap is unnecessary, the cost is saved, the inertial flow is reduced, and the stability of the dyke body is improved. Moreover, by using these useless marine soft soil and industrial solid waste materials, usable construction material is processed, waste material can be turned into wealth, and the environment can be protected, and mean while the economic benefits can be created.

The invention discloses a multi-stage linkage collecting device and method for ore leaching liquid in a heap leaching field of a metal mine. The multi-stage linkage collecting device for ore leaching liquid in the heap leaching field of the metal mine comprises a plurality of ore leaching liquid collecting systems laid between adjacent material layers of the heap leaching field, a plurality of communicating pipelines correspondingly connected with the output ends of the ore leaching liquid collecting systems one to one, and conveying pipelines correspondingly connected with the output ends of the plurality of communicating pipelines. Each ore leaching liquid collecting system is formed by connecting a plurality of collecting pipes in a crossed mode, the input ends of the communicating pipelines are correspondingly connected with the collecting pipes on the outermost layers of the ore leaching liquid collecting systems, and the output ends of the conveying pipelines are connected with a liquid collecting pool. By means of the mode, the bottom end of each layer of the heap leaching field is provided with the ore leaching liquid collecting system, the ore leaching liquid is conveyed through the same conveying pipeline, recycling linkage of multi-stage ore leaching liquid can be achieved, and the seepage time and distance of the ore leaching liquid in the heap leaching field are shortened.

Provided are a slant grouting control steel anchor pipe frame and a construction method thereof. A primary grouting body is poured to the peripheral space of a steel anchor pipe through a primary grouting pipe; after the primary grouting body is solidified, a secondary grouting body is poured to the outside through a secondary grouting hole in the steel anchor pipe wall in a compression mode, the secondary grouting body splits the primary grouting body through the secondary grouting hole and is diffused to a peripheral rock and earth mass and forms a mixed grouting body with the primary grouting body. A concrete beam is poured along a slope to wrap the top of the steel anchor pipe in the beam. The slant grouting control steel anchor pipe frame combines the advantages of an anchor rod frame and a grouting control technology, the steel anchor pipe is used as a protection measure and a secondary grouting channel, and by means of improvement of the strength of the peripheral rock and earth mass through the secondary grouting, a steel pipe and the peripheral rock and earth mass form a whole body to defend a slope together. A slant grouting control steel anchor pipe frame structure has the advantages of being advanced in technology, reasonable in economy, fast in construction and the like and is a novel slope reinforcing technology with good developing prospects.

The invention provides a reinforced composite geotechnical cushion capable of preventing the capillary barrier effect and a manufacturing method thereof. The composite geotechnical cushion is formed by sandwiching a gravel and hemp thread layer, a hot-melt plastic wire layer and a reinforced grating layer. The reinforced composite geotechnical cushion is used in the side slope embankment filling anti-sliding reinforcement project and is particularly suitable for a side slope embankment filling project in a region with more rainwater in the south, the capillary barrier effect of infiltration rainwater at the reinforced layer can be remarkably reduced or eliminated, the infiltration speed of the rainwater can be increased, the seepage along the slope surface can be reduced, and the infiltration damage of soil mass can be avoided; and meanwhile, the composite geotechnical cushion can also improve the anti-sliding performance of the side slope soil mass and reduce the risk of landslide.

The drawing device according to the present invention performs drawing by arranging straight line data on pixels and determining the luminance value of each pixel. The pixel coordinates of the starting point and the end point of the line are extracted; the reference point determination part determines the center of the pixel pixel where the oblique line is located as the reference point; the candidate line generation part generates the starting point and the end point to be extracted by the end point extraction part A candidate line formed by connecting points located within the pixel pixels; a candidate line selection section that selects a candidate line that minimizes the sum of distances between the candidate line generated by the candidate line generation section and the reference point; and a data correction section , which corrects oblique lines to the candidate lines selected by the candidate line selection section.

The invention discloses a single well zipper type fracturing gas testing construction method which comprises a fracturing period and a whole well open flow period, in the fracturing period, multi-section fracturing operation is carried out in the daytime and open flow operation is carried out at night, the multi-section fracturing operation and the open flow operation are carried out alternately, and the whole well open flow period is carried out after the multi-section fracturing operation is carried out in the daytime in the last day. The method is easy to operate, environment-friendly, energy-saving and emission-reducing, the construction period can be effectively shortened, the operation cost is saved, and the problems that the normal-pressure gas reservoir flow-back energy is insufficient, reservoir water damage is serious, and the single-well flow-back liquid sewage treatment cost is high are solved.

The invention provides a reinforced composite geotechnical cushion capable of preventing the capillary barrier effect and a manufacturing method thereof. The composite geotechnical cushion is formed by sandwiching a gravel and hemp thread layer, a hot-melt plastic wire layer and a reinforced grating layer. The reinforced composite geotechnical cushion is used in the side slope embankment filling anti-sliding reinforcement project and is particularly suitable for a side slope embankment filling project in a region with more rainwater in the south, the capillary barrier effect of infiltration rainwater at the reinforced layer can be remarkably reduced or eliminated, the infiltration speed of the rainwater can be increased, the seepage along the slope surface can be reduced, and the infiltration damage of soil mass can be avoided; and meanwhile, the composite geotechnical cushion can also improve the anti-sliding performance of the side slope soil mass and reduce the risk of landslide.

The invention provides a well-type irrigation system. The system is composed of a well and a water-level controller or a water supply bottle, wherein the well comprises a water holding tank (an water-impermeable container), a water delivery pipeline, a supporting and water-level observation well and a buoy; the water-level controller comprises a water inlet valve, a bearing pipe, a switch valve and a floating body; the bearing pipe is connected with the water delivery pipeline; the interior of the bearing pipe is provided with the floating body located above a water outlet; the floating body is connected with and controls to open and close the water inlet valve; and the selectable water supply bottle is composed of a water bottle, a movable straight pipe part and a height adjuster, is directly and invertedly arranged on the supporting and water-level observation well of the well, and can be used in coordination or mutual replacement with the water-level controller to automatically supply water by utilizing a pressure control principle. Thus, according to the invention, depending on the principles of penetration force and communicating pipes, the well is buried in soil; when the water level in the water holding tank is no higher than the opening of the water holding tank, water upward seeps from the bottom part of the water holding tank; and when the seepage water level is beyond the opening of the water holding tank, exterior soil is subjected to irrigation with water.

The invention discloses a drill hole fluid sealing method for coal mine gas extraction. A water injection pipe is installed in an extraction pipe and is provided with a closed branch pipe penetrating through the extraction pipe and a one-way valve, a plug is installed on the surface of the extraction pipe and located on two sides of the one-way valve respectively, the water injection pipe is provided with a pressure gauge and a main valve, and an inner cavity is filled with a sealing fluid. The extraction pipe is put in a drill hole, the valve is turned on for water injection, and when pressure rises to reach a certain pressure, the main valve is closed. The water injection pipe is connected with a lower-pressure water source, water flow slow-seeping seal is continuously conducted on the drill hole, and gas extraction concentration data is observed every day. The drill hole fluid sealing method uses a cementitious viscous fluid and water as hole sealing materials to replace traditional solids based on 'solid seals colloid, colloid seals liquid and liquid seals gas', the compactness of a hole sealing section is effectively improved, and the purpose of improving a hole sealing effect is achieved.

The invention provides a breathable super absorbent polymer (sap) coating composite material for preventing slope surface infiltration and a manufacturing method thereof. The sap coating composite material is sandwiched by a sap coating honeycomb grille, a three-dimensional partition layer, and a reinforced permeable layer, the sap coating composite material is used in slope embankment filling surface waterproofing engineering and is particularly suitable for slope embankment filling engineering in areas with more rain in the south, seepage failure caused by infiltration of rainwater to the slope embankment can be significantly reduced or eliminated, drainage of rainwater from the surface of the slope embankment is accelerated, seepage flowing down the slope surface is reduced, soil body seepage damage is avoided, when the weather is fine, the sap coating composite material can shrink so that honeycomb ventilation holes are opened, and excessive moisture in the slope embankment is drained; and at the same time, according to the sap coating composite material, the anti-sliding performance of the slope soil body can be further improved, and the risk of landslides is lowered.

The invention discloses a multi-stage centrifugal pump with a residue filtering and removing function for liquid drainage, and relates to the technical field of centrifugal pumps. The multi-stage centrifugal pump with the residue filtering and removing function for liquid drainage is characterized in that a fixing block is connected to a threaded rod at the output end of a motor, a scraping plateis connected to the lower end of an L-shaped rod on the side surface of the fixing block, a first filter screen connected with the side wall of a cavity is arranged at the lower end of the scraping plate, a water pump is prevented from being blocked by garbage, the working efficiency is improved, and meanwhile, follow-up sewage treatment is facilitated; and a second filter screen and a third filter screen are connected to a first spring and a second spring in a first sliding groove and a second sliding groove respectively, a third sliding groove and a fourth sliding groove corresponding to thesecond filter screen and the third filter screen respectively are formed in a supporting plate, a third spring in the third sliding groove is connected with the second filter screen, a fourth springin the fourth sliding groove is connected with the third filter screen, a fourth filter screen is embedded in the supporting plate, and the water pump is arranged on the bottom surface of a mounting cavity, so that garbage collection is facilitated, and water in the garbage can be pumped back into the centrifugal pump.

The injection structure of the molding mold for polymer articles provided by the present invention includes a first mold part and a second mold part spaced apart from each other, and a mold part between the first mold part and the second mold part The third mold part, and the supply position of the external raw material is located at the side of the first mold part away from the second mold part, and further, in order to supply the external raw material to the position between the second mold part and the third mold part In the mold chamber of the present invention, the injection structure further includes a passage provided on the first mold part, through which the external raw material can be directly passed through the third mold part from the supply position. The flow channel is injected into the mold chamber, and it is not necessary to make the external raw material flow through the first mold part and the third mold part in sequence before entering the mold chamber as in the known technology, so as to achieve the cost. purpose of the invention.

The invention discloses a green plant caring device. The green plant caring device comprises a liquid storing device and a soaking device, wherein liquid is stored in the liquid storing device, and an opening is formed in the lower portion of the liquid storing device; the soaking device is connected with the liquid storing device through the opening and goes deeply into roots of a green plant; under the action of gravity, the liquid passes through the opening in the lower portion of the liquid storing device and is released to the roots of the green plant through the soaking device to be absorbed by the green plant. The green plant caring device is convenient to use, free of power, capable of achieving comprehensive caring including water, nutrient solution and chemicals, efficient, multipurpose, wide in application range and capable of widely applied to urban landscaping, landscaping, and green plants in remote regions and courtyard, saves time and labor and saves water.

The invention discloses an automatic delay infiltrating irrigation device suitable for an arid area. The device comprises a water tank, a water pressure regulating box, pipelines and a lever adjusting mechanism, wherein a lifting valve is arranged on a water outlet of the water tank, a weight regulating body is arranged in the water pressure regulating box, the pipelines include a water supply pipe and an infiltrating irrigation pipe, the water supply pipe is connected between the water outlet of the water tank and a water inlet of the water pressure regulating box, the infiltrating irrigation pipe is connected to a water outlet of the water pressure regulating box, the lever adjusting mechanism comprises a lever, a lever fulcrum, a valve bracing wire and a weight regulating body bracing wire, the lever is located on the lever fulcrum, the valve bracing wire and the weight regulating body bracing wire are located at the two ends of the lever respectively, the weight regulating body is connected to the weight regulating body bracing wire, and the lifting valve is connected with the valve bracing wire. Compared with the prior art, the device has the advantages of being capable of achieving automatic delay infiltrating irrigation, simple in structure, remarkable in water saving effect, quite low in using cost, suitable for the arid area and broad in popularization prospect.

The invention provides a method for designing a gas storage cavern in a goaf combining a curtain and a water curtain, which includes the following steps: S1: According to the mining data of the mine and the detailed geological survey data, delineate the underground gas storage for storing natural gas area; S2: set multiple roadways above the underground gas storage area; S3: drill multiple grouting holes and water curtain holes in the surrounding rock in the roadway, and pass through the water curtain holes and The grouting hole injects water and grouting into the surrounding surrounding rocks to form a water curtain and a curtain to seal the underground gas storage area. The present invention establishes curtain and water curtain system, grouting reinforces the surrounding rock, and fills pores and fissures to reduce seepage flow and seepage pressure; water curtain holes form a water curtain system to reinforce and seal the natural gas storage area, preventing natural gas from diffusing to the surroundings, Leakage, to ensure the safety of underground gas storage in mines.

The invention relates to a method preventing the spontaneous combustion of stored coal piles by covering coal piles by utilizing oxygen-insulating materials, which comprises the following steps: crushing and screening the oxygen-insulating materials so as to obtain granulated oxygen-insulating materials with a grain size less than 6mm; determining the required covering thickness of the oxygen-insulating materials according to the shortest spontaneous combustion period of a coal pile corresponding to the covering thickness of the oxygen-insulating materials; and paving the oxygen-insulating materials on the surface of the mid-lower part of the coal pile. Because the oxygen-insulating materials with smaller osmotic coefficient are adopted to cover the surface of the coal pile, the air is inhibited from entering the coal pile in a diffusion or seepage mode, and the rate of low-temperature oxidation reaction of coal and oxygen is lowered so as to achieve the purpose of preventing the spontaneous combustion of stored coal piles.