Method for long-distance directional self-flowing drainage of strong water-containing body

Abstract

A method for long-distance directional self-flowing drainage of a strong water-containing body comprises the following steps that basic information of a burning area is determined, and a water dynamic monitoring system is established; s2, a grouting curtain closure system is established; s3, establishing a directional drilling self-flowing water drainage system; according to the invention, the application of the trenchless directional drilling machine in the coal mine is realized, the damage of a traditional excavation mode to the surrounding environment of construction is avoided through a drilling mode, the influence of construction on traffic, environment, infrastructure, life and work of residents and the like is greatly reduced, and meanwhile, the time and the cost can be saved. Not only can the working efficiency be improved, but also the influence on the environment during construction can be reduced, and the sustainable development of engineering construction is greatly promoted.

Description

Technical Field

[0001] The present invention relates to the field of drainage, and specifically to a method for remotely and directionally self-flowing and discharging a strong water-bearing body. Background Art

[0002] In some areas, there is the phenomenon of coal seam burned and altered rock. Due to the shallow outcrop of the coal seam and the developed surface gullies, after the exposed part of the coal seam after being cut by the gully burns spontaneously, it will burn inward all the time, forming a burned area. In the burned area, the pores, fissures, and cavities of the burned and altered rock strata are developed, providing good spaces for the circulation, runoff, storage, etc. of groundwater. Under favorable tectonic conditions, it is easy to form a strong water-rich aquifer. Due to the characteristics of large water pressure and large water volume of the water accumulation in the burned area, once penetrated, it comes menacingly and has great destructiveness, and often becomes the main cause of mine water disaster accidents.

[0003] At present, the treatment methods for mine water disasters are mostly to excavate roadways, drill holes in the roadways to lead the accumulated water to the sump, and then conduct centralized pumping drainage through a water pump. This method not only causes damage to the surrounding construction environment during excavation, but also requires a large number of equipment for the pumping drainage method, with high costs. Moreover, it is necessary to coordinate multiple resources such as mines, residential areas, and forest areas before excavation, which takes a long time.

[0004] Moreover, the existing methods for treating mine water disasters can only solve the problem at a short distance. With the continuous mining of the coal seam, it is necessary to frequently excavate roadways for drainage, which is time-consuming and laborious.

[0005] In response to this, the applicant has proposed a non-excavation solution for remotely solving the water disaster problem, which can greatly save the drainage cost. Summary of the Invention

[0006] To solve the technical problems existing in the above background art, the present invention provides a method for remotely and directionally self-flowing and discharging a strong water-bearing body.

[0007] The technical solution of the present invention is as follows:

[0008] A method for remotely and directionally self-flowing and discharging a strong water-bearing body, comprising the following steps:

[0009] S1. Determine the basic information of the burned area and establish a water dynamic monitoring system;

[0010] S2: Establish a grouting curtain interception system;

[0011] S2.1. Analyze the water collection source of the burned area, establish a curtain belt at the water collection point, and conduct borehole grouting;

[0012] S2.2. Check the grouting effect of the curtain belt;

[0013] S2.3. Construct sumps along the inner side of the curtain belt, dig catch drains on the outer side to connect to open channels, and bury drainage pipes to connect the sumps and catch drains;

[0014] S2.4. Construct bottom drainage holes in the loose layer in front of the curtain belt, and connect the bottom drainage holes to the catch drains;

[0015] S3: Establish a directional drilling gravity drainage system;

[0016] S3.1. Determine the drill site and the lowest point on the ground of the fire area. The elevation of the drill site is lower than the lowest floor elevation of the fire area, and the lowest point on the ground of the fire area is between the drill site and the lowest floor of the fire area;

[0017] S3.2. Construct the first drainage hole F1;

[0018] From the drill site, construct the main hole forward with the first opening inclination angle. After reaching the exposed fire area, start to adjust the inclination angle upward and drill into the fire area;

[0019] After the construction of the main hole is completed, retract the drill, and construct several branch holes at the front section of the exposed fire area. The branch holes extend towards the upper part of the fire area;

[0020] S3.3. Construct the second drainage hole F2;

[0021] Construct the main hole from the lowest point on the ground of the fire area in the reverse direction towards the drill site behind. After the construction is completed, use a directional drilling rig at the drill site to open several branch holes at the preset position of the main hole forward. The branch holes extend towards the upper part of the fire area;

[0022] S3.3. Construct the third drainage hole F3;

[0023] Construct the main hole from the lowest point on the ground of the fire area forward and downward, and open several upward-extending branch holes at the preset position. The line of the third drainage hole penetrates and communicates with all fire areas.

[0024] It should be noted that due to the different terrains of the mine sites, the mining area targeted by the treatment plan of the present invention is such that there is a possibility of gravity drainage by means of the terrain at the location of the fire area. At this time, if the traditional main shaft pumping and drainage + excavation roadway pumping and drainage method is still used, it will cause an increase in workload and cost.

[0025] Therefore, the present invention adopts the overall policy of "blocking first and then draining". When specifically draining water, directional drilling is used to construct drainage holes, and the directional drilling technology is introduced into the coal mine field for the first time, creating a precedent in the industry. However, the drilling distance of the directional drill is limited and can only drill to about 1000 meters. It becomes more difficult to drill deeper.

[0026] In response to this, the applicant has creatively designed a "section-by-section relay" drainage method. The three drainage holes are an integral and indivisible technical solution:

[0027] First, construct the first drainage hole F1, drill forward to the extreme position, and open multiple branch boreholes to expand the water diversion range. At this time, in order to achieve the effect of one-time and long-distance drainage, the drill site is far from the fire area, and the first drainage hole cannot pass through all the fire areas.

[0028] It should be noted that the drill site should not be too far away. To facilitate the staged relay of the three drainage holes, the maximum length of the main hole of the first drainage hole exceeds the lowest point on the ground of the fire area.

[0029] Then, construct the second drainage hole F2. The main hole connects the lowest point on the ground of the fire area and the drill site from top to bottom, and can drain the accumulated water on the ground of the fire area over a long distance. The construction direction is very important. The difficulty of directional drilling increases with the progress. Therefore, it is advisable to first drill in the fire area and then drill towards the drill site.

[0030] Then, reverse the construction, drill from the drill site towards the bottom of the fire area, and construct several branch boreholes to increase the water diversion range together with several branch boreholes of the first drainage hole.

[0031] Therefore, the second drainage hole F2 has three functions:

[0032] One is to drain the accumulated water on the ground of the fire area;

[0033] The second is to drain the accumulated water inside the fire area;

[0034] The third is to drain the accumulated water guided by the third drainage hole;

[0035] That is, it plays a connecting role.

[0036] Finally, the purpose of constructing the third drainage hole is to penetrate all the fire areas. Since the distribution of the fire areas is irregular, draining water only from the bottom of the fire area will surely miss some accumulated water in the fire areas. The third drainage hole is constructed above the first drainage hole and passes through the middle of the fire area. The branch boreholes can penetrate and connect all the fire areas, and the highest points of the branch boreholes are all higher than the lowest point on the ground of the fire area, so as to lead the accumulated water to the entrance position of the second drainage hole. It has three functions:

[0037] One is to construct forward from the lowest point on the ground of the fire area, taking more care of the front fire area, and jointly forming an ultra-long-distance drainage belt with the first drainage hole that takes care of the rear fire area, so as to drain the accumulated water in the fire area over a long distance.

[0038] The second is to act on the middle position of the fire area, penetrate all the fire areas, and achieve full coverage.

[0039] Thirdly, the accumulated water in the upper layer of the fire area is first drained to the lowest point on the ground of the fire area at the entrance of the second drainage hole, and then drained to the drill site. The drainage of the accumulated water in the lower layer of the fire area through the first drainage hole shares the pressure of accumulated water discharge, and the two complement each other.

[0040] In summary, through the segmented arrangement of three drainage holes, the present invention realizes the long-distance drainage of the accumulated water in the upper layer, lower layer and ground of the fire area in a relay manner, and adopts the non-excavation method, which greatly saves costs compared with the traditional excavation method.

[0041] Specifically, in step S1, according to the regional geological report and on-site exploration, information such as the location, elevation, and water level elevation of the accumulated water in the fire area is determined;

[0042] Above the fire area, a plurality of ground water level observation holes are designed and constructed along its trend, and the drilling holes are drilled to the bottom boundary of the fire area;

[0043] Install monitoring devices to form a complete hydrogeological monitoring system.

[0044] In step S2.1, the curtain drilling holes are arranged in multiple rows in parallel according to a "line". The curtain drilling holes pass through the fracture zone of the fire area and enter the intact rock formation. The curtain drilling holes are designed with two levels of pore diameters, and the upper pore diameter is larger than the lower pore diameter.

[0045] In step S2.2, a plurality of inspection drilling holes are evenly constructed in the curtain zone area. At the same time, a plurality of hydrogeological observation drilling holes are constructed outside and inside the curtain grouting zone for water injection construction to inspect the grouting effect of the curtain zone;

[0046] Observe the grouting effect of the curtain zone. If the grouting effect is good, continue the construction. If it is found that there is a blank area for slurry diffusion, add shallow grouting holes in the loose layer to improve the curtain zone.

[0047] In step S2.4, a casing is set under the bottom drainage hole. The outer side of the curtain zone is a slotted pipe, and the inner side is a solid pipe. The solid pipe section is used to seal the casing with cement slurry.

[0048] In step S3, the main hole of the drainage hole includes at least two levels of holes, and the opening hole diameter is larger than the internal hole diameter. After each level of hole is drilled, a corresponding size casing is set.

[0049] In step S3, a number of branch drilling holes at the end of each drainage hole are distributed in a divergent shape, generally including three directions: left, middle, and right, so as to achieve wide coverage.

[0050] In step S3, a slotted pipe is arranged in the branch drilling hole. The main function of the slotted pipe is to protect the drilling hole wall, prevent mud from infiltrating into the drilling hole, and establish a long-term and effective drainage channel for the drainage of the accumulated water in the fire area.

[0051] In step S3.3, the front section of the second drainage hole F2 extends towards the first drainage hole F1. After approaching, construction is carried out at the second opening inclination angle, which is different from the first opening inclination angle. That is, the two are parallel in the vertical plane and have different inclination angles in the horizontal direction, which helps to expand the penetration range.

[0052] Preferably, both the first opening inclination angle and the second opening inclination angle are arranged obliquely upward, and the inclination angle is not greater than 2 degrees, approaching flatness, which reduces the construction pressure of the directional drilling.

[0053] Through the above design, the method for remotely directional self-flow drainage of a strong water-bearing body in the present invention has the following design highlights:

[0054] 1. The application of the trenchless directional drill in coal mines is realized. By means of drilling, the damage to the surrounding construction environment caused by the traditional excavation method is avoided, and the impacts on traffic, environment, infrastructure, residents' living and working, etc. during construction are greatly reduced. At the same time, time and costs can be saved. It can not only improve work efficiency, but also reduce the impact on the environment during construction, greatly promoting the sustainable development of the project construction.

[0055] 2. The distance shortcoming of the directional drill is overcome. By opening a hole at a low-lying area on the ground with a directional drill and constructing a directional self-flow drilling hole along the bottom boundary of the coal mine fire area, the runoff channel is connected in the way of "section-by-section relay", so as to achieve long-distance water drainage, and the purpose of self-flow water drainage is achieved by using the gravity of water itself. It can be used in cooperation with the main shaft drainage, saving the cost of pumping and draining water.

[0056] 3. Directional drill bottom drainage holes and surface water collection and drainage in the curtain grouting belt. Considering that the water level outside the curtain belt is relatively high and the water in front of the curtain may bypass the curtain and flow downward during heavy rain in the flood season, the water outside the curtain belt is self-flow drained through the bottom drainage holes; and the surface runoff is collected by the catchment ditch and drained to the open channel through the drainage pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In the drawings:

[0058] Figure 1 is the longitudinal section layout schematic diagram of three drainage holes in the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0059] See Figure 1 , due to the different terrains of the mine sites, the mining area targeted by the treatment plan of the present invention is the location where the fire area exists and there is a possibility of self-flow drainage by means of the terrain. At this time, if the traditional main shaft pumping and drainage + excavation roadway pumping and drainage method is still adopted, the workload and cost will increase.

[0060] A method for remotely directional self-flow drainage of a strong water-bearing body provided by the present invention includes the following steps:

[0061] S1. Determine the basic information of the fire area and establish a water dynamic monitoring system;

[0062] Specifically, determine the location, elevation, and water accumulation level elevation of the fire area according to the regional geological report and on-site exploration;

[0063] Above the fire area, design and construct multiple ground water level observation holes along its trend, and drill the holes to the bottom boundary of the fire area;

[0064] Install monitoring devices to form a complete hydrological monitoring system. In this way, the change of the underground water accumulation level can be grasped in time, and the effect of curtain grouting interception and ground directional drilling self-flow drainage can be truly reflected. At the same time, the mutual relationship between the water discharge volume and the recharge volume can be mastered, and the water accumulation level in the mine fire area can be monitored in real time.

[0065] S2: Establish a grouting curtain interception system to reduce the dynamic water recharge volume of surface water to the fire area;

[0066] S2.1. Analyze the water source of the fire area, establish a curtain zone at the water collection point, and carry out borehole grouting;

[0067] Specifically, the curtain boreholes are arranged in multiple rows in parallel according to "lines", the row spacing is 15m, the boreholes are arranged in a "triangle, interspersed, staggered" manner, the orifice distance of each row of boreholes is 10m, the staggered distance between the orifices of two rows of boreholes is 5m, the curtain boreholes pass through the fracture zone of the fire area and enter the intact rock formation, and the curtain boreholes are designed according to two-stage borehole diameters, with the upper borehole diameter larger than the lower borehole diameter.

[0068] S2.2. Check the grouting effect of the curtain zone;

[0069] Uniformly construct multiple inspection boreholes within the curtain zone area. At the same time, construct multiple hydrological observation boreholes outside and inside the curtain grouting zone, and carry out water injection construction to check the grouting effect of the curtain zone;

[0070] To achieve mutual verification between drilling and grouting, all the boreholes on one line are organized for construction according to the construction sequence of "subsequent order, interspersed type". After the construction of one line is completed, the boreholes of other lines are constructed in turn;

[0071] Observe the grouting effect of the curtain zone. If the grouting effect is good, continue the construction. If there is a blank area in the slurry diffusion, add shallow holes for grouting in the loose layer to improve the curtain zone.

[0072] S2.3. Construct sump pits along the inner side of the curtain zone, dig catch ditches on the outside and connect them to open channels, and bury drainage pipes to connect the sump pits and catch ditches;

[0073] In this embodiment, first, an excavator is used to dig a catchment ditch about 101 m long, 1.5 m deep, and 2 m wide along the curtain zone. An anti-seepage membrane is laid at the bottom of the ditch, and then large cobblestones are filled in, small stones are laid on the top, and then the soil is covered for greening. Then, a sump is constructed, and a drainage pipe with a diameter of φ273 mm is buried underground to connect the sump and the open channel, so that the gushing water is drained to the open channel and discharged.

[0074] S2.4. Construct bottom drainage holes in the loose layer on the front side of the curtain zone, and the bottom drainage holes communicate with the catchment ditch;

[0075] A casing is arranged under the bottom drainage hole. The outer side of the curtain zone is a perforated pipe, and the inner side is a solid pipe. The solid pipe section is used to seal the casing with cement slurry.

[0076] S3: Establish a directional drilling gravity drainage system, make full use of the natural terrain height difference in the mining area, and avoid the occurrence of water disasters in the fire area when mining reaches this range.

[0077] The directional drilling rigs used in the present invention include DDW-3000 type and ZYL-17000D type.

[0078] S3.1. Determine the drill site and the lowest point on the ground of the fire area. The elevation of the drill site is lower than the lowest floor elevation of the fire area, and the lowest point on the ground of the fire area is located between the drill site and the lowest floor of the fire area;

[0079] For example, in this embodiment, according to the original geological exploration boreholes and water level observation holes, the current water level elevation of the fire rock is determined to be +1510.9 m, the lowest floor elevation of the fire rock is +1469.17 m, and the highest floor elevation is +1581.27 m.

[0080] It is designed to set a drill site at an elevation of +1460 m at the northern part ( Figure 1 right side position) of the mine. Construction at this location can ensure that gravity drainage is formed after the drilling construction is completed, reducing the mine drainage cost.

[0081] S3.2. Construct the first drainage hole F1;

[0082] Orient and construct the main hole from the drill site forward with the first opening inclination angle. After the fire area is exposed during the construction, start to adjust the inclination angle upward and drill into the fire area;

[0083] In this embodiment, the opening elevation of the main hole is 1460 m, and the first opening inclination angle is +1°.

[0084] The main hole uses a DDW-3000 type horizontal directional drilling rig. After the construction is completed, the drill is withdrawn, and it is replaced with a ZYL-17000D type horizontal directional drilling rig to construct several branch holes at the front section where the fire area is exposed. The branch holes extend upward toward the fire area, and the horizontal distance between multiple branch holes and the F1 hole is 50 - 80 m.

[0085] S3.3, Construct the second drainage hole F2;

[0086] Use a DDW-3000 horizontal directional drill to construct the main hole from the lowest point on the ground in the fire area in the reverse direction towards the drill field at the back. After the construction is completed, use a ZYL-17000D horizontal directional drill at the drill field to open several branch holes at the preset position of the main hole forward, and the branch holes extend towards the upper part of the fire area;

[0087] Specifically, the front section of the second drainage hole F2 extends towards the first drainage hole F1. After approaching, it is constructed with the second opening inclination angle, and the second opening inclination angle is different from the first opening inclination angle. That is, the two are parallel in the vertical plane and have different inclination angles in the horizontal direction, which helps to expand the penetration range.

[0088] In this embodiment, the second opening inclination angle is +0.7°. Both the first opening inclination angle and the second opening inclination angle are arranged obliquely upward, and the inclination angle is not greater than 2 degrees, approaching flatness, reducing the construction pressure of the directional drill.

[0089] S3.3, Construct the third drainage hole F3;

[0090] Construct the main hole from the lowest point on the ground in the fire area forward and downward, and open several branch holes extending upward at the preset position. The line of the third drainage hole penetrates and communicates with all fire areas.

[0091] Since the temperature in the fire area is relatively high, to prevent the screw motor from being burned out due to excessive temperature, after drilling 600m with a DDW-3000 horizontal directional drill for the main hole opening, the drill is withdrawn and the branch hole is opened.

[0092] In the present invention, the opening positions of the second drainage hole F2 and the third drainage hole F3 are the same. After the opening of the second drainage hole is completed, the DDW-3000 directional drill turns the drill head in place and starts to construct the third drainage hole.

[0093] In step S3, the main hole of the drainage hole includes at least two levels of holes, the opening diameter is larger than the internal diameter, and after each level of hole is drilled, a corresponding size casing is set down.

[0094] Specifically, in this embodiment, the drainage hole drilling adopts a three-level hole diameter and two-level casing structure: the first-level hole diameter is φ550mm, and a φ406mm casing is set down for 30 - 50m to protect the hole mouth; the second-level hole diameter is φ350mm, and the φ273mm casing is set down by means of drill pipe back dragging. A slotted pipe is set down in the fire area and a solid pipe is set down within the bedrock range; the third-level directional branch hole diameter is φ219mm, and a φ168mm slotted pipe is set down for easy drainage. Of course, the hole diameter size is calculated according to the water supply volume of the mining area, and different mining area environments adopt different casing hole diameters.

[0095] A number of branch drill holes at the end of each drainage hole are distributed in a divergent manner, generally including three directions: left, middle, and right, to achieve wide coverage.

[0096] The main function of the perforated pipe in the branch drill hole is to protect the drill hole wall, prevent mud from seeping into the drill hole, and establish a long-term and effective drainage channel for the drainage of accumulated water in the fire area.

[0097] The present invention adopts the overall policy of "plugging first and then draining". When specifically draining water, directional drilling is used to construct drainage holes, and the directional drilling technology is first introduced into the coal mine field, creating a precedent in the industry. However, the drilling range of directional drilling is limited, only able to drill to about 1000 meters, and it becomes more difficult to drill deeper.

[0098] In response to this, the applicant has creatively designed a drainage method of "sectional relay". The three drainage holes are an integral and indivisible technical solution:

[0099] First, construct the first drainage hole F1, drill forward to the limit position, and open a number of branch drill holes to expand the water diversion range. At this time, in order to achieve the effect of long-distance and once-and-for-all water drainage, the drill site is located far from the fire area, and the first drainage hole cannot penetrate through all the fire area ranges.

[0100] It should be noted that the drill site should not be too far away. For the convenience of sectional relay of the three drainage holes, the maximum length of the main hole of the first drainage hole exceeds the position of the lowest point on the ground of the fire area.

[0101] Then, construct the second drainage hole F2. The main hole connects the lowest point on the ground of the fire area and the drill site from top to bottom, and can drain the accumulated water on the ground of the fire area over a long distance. The construction direction is very important. The difficulty of directional drilling increases with the progress, so it is selected to drill in the fire area first and then drill towards the drill site.

[0102] Then, reverse construction, drill from the drill site towards the bottom of the fire area, construct a number of branch drill holes, and increase the water diversion range together with the number of branch drill holes of the first drainage hole.

[0103] Therefore, the second drainage hole F2 has three functions:

[0104] One is to drain the accumulated water on the ground of the fire area;

[0105] The second is to drain the accumulated water inside the fire area;

[0106] The third is to drain the accumulated water guided by the third drainage hole;

[0107] That is, it plays a connecting role.

[0108] Finally, the purpose of constructing the third drainage hole is to penetrate all the burned areas. Since the distribution of the burned areas is irregular, draining water only from the bottom of the burned areas will inevitably miss the accumulated water in some burned areas. The third drainage hole is constructed above the first drainage hole and passes through the middle position of the burned areas. The branch drill holes can penetrate and connect all the burned areas, and the highest points of the branch drill holes are all higher than the lowest point of the ground in the burned areas, so that the accumulated water can be led to the entrance position of the second drainage hole. It has three functions:

[0109] First, when constructing forward from the lowest point of the ground in the burned areas, more attention is paid to the front burned areas, and together with the first drainage hole that takes care of the rear burned areas, it forms an ultra-long-distance drainage belt, which can drain the accumulated water in the burned areas over a long distance.

[0110] Second, it acts on the middle position of the burned areas, penetrates all the burned areas, achieving full coverage.

[0111] Third, the accumulated water in the upper layer of the burned areas is first drained to the lowest point of the ground in the burned areas at the entrance of the second drainage hole, and then drained to the drill site. Together with the drainage of the accumulated water in the lower layer of the burned areas through the first drainage hole, it shares the pressure of water discharge, and the two complement each other.

[0112] In summary, through the segmented layout of the three drainage holes, the present invention realizes the long-distance drainage of the accumulated water in the upper layer, lower layer and ground of the burned areas in a relay manner, and adopts a non-excavation method, which greatly saves costs compared with the traditional excavation method.

Claims

1. A method for long-distance directional gravity drainage of a strong water-containing body, characterized in that: The following steps are involved: S1. Determine the basic information of the burn area and establish a water dynamic monitoring system; S2: Establish a grouting curtain interception system; S2.

1. Analyze the source of water in the burn area, establish curtain belts at the water collection points, and conduct drilling and grouting; S2.

2. Check the grouting effect of curtain tape; S2.

3. Construct a water collection pit along the inner side of the curtain belt, dig a water collection ditch on the outer side to connect to the open channel, and bury a drainage pipe to connect the water collection pit and the water collection ditch; S2.

4. Construct bottom drain holes in the loose layer in front of the curtain belt, and connect the bottom drain holes to the water collection ditch; S3: Establish a directional drilling gravity drainage system; S3.

1. Determine the lowest ground point of the drilling site and the burn area. The elevation of the drilling site is lower than the elevation of the lowest floor of the burn area. The lowest ground point of the burn area is between the drilling site and the lowest floor of the burn area. S3.2, construct the first drainage hole F1; The main hole is constructed forward from the drilling site at the first opening inclination angle. After the construction reaches the burn area, the inclination angle is adjusted upward and drilling is carried out toward the burn area. After the main hole is completed, the drill is withdrawn and several branch holes are constructed at the front part of the exposed burn area, and the branch holes extend toward the upper part of the burn area; S3.3, construct the second drainage hole F2; The main hole is constructed from the lowest point of the ground in the burn area in the reverse direction toward the drilling site behind. After the construction is completed, the drilling site uses a directional drill to open several branch holes at the preset position of the main hole. The branch holes extend toward the upper part of the burn area. S3.3, construct the third drainage hole F3; A main hole is constructed from the lowest point of the ground in the burn area to the forward lower part, and several branch holes extending upward are opened at preset positions. The line of the third drainage hole penetrates and communicates all the burn areas.

2. The method according to claim 1, characterized in that In step S1, the location, elevation, and water level elevation of the burnt area are determined based on the regional geological report and on-site exploration; Above the burn area, multiple ground water level observation holes are designed and constructed along its direction, and the holes are drilled to the bottom boundary of the burn area; Install monitoring devices to form a complete hydrological monitoring system.

3. The method according to claim 1, characterized in that In step S2.1, the curtain drilling holes are arranged in multiple rows in parallel in a "line", the curtain drilling holes pass through the fracture zone of the burn area and enter the intact rock formation, and the curtain drilling holes are designed according to two-level apertures, with the upper aperture being larger than the lower aperture.

4. The method according to claim 1, characterized in that: In step S2.2, multiple inspection boreholes are uniformly constructed in the curtain belt area, and multiple hydrological observation boreholes are constructed on the outside and inside of the curtain grouting belt to perform water filling construction to inspect the grouting effect of the curtain belt; Observe the grouting effect of the curtain belt. If the grouting effect is good, continue the construction. If blank areas for slurry diffusion are found, add shallow grouting holes in the loose layer to improve the curtain belt.

5. The method according to claim 1, characterized in that In step S2.4, a casing is arranged under the bottom leakage hole, the outer side of the curtain belt is a flower pipe, and the inner side is a solid pipe. The casing is sealed with cement slurry in the solid pipe section.

6. The method according to claim 1, characterized in that In step S3, the main hole of the drainage hole includes at least two levels of holes, the opening hole diameter is larger than the internal hole diameter, and each level of hole is drilled and a casing of corresponding size is arranged below.

7. The method according to claim 1, characterized in that In step S3, a plurality of branch drill holes at the end of each drainage hole are distributed in a divergent manner.

8. The method according to claim 1, characterized in that: In step S3, a flower tube is arranged in the branch borehole.

9. The method according to claim 1, characterized in that: In step S3.3, the front section of the second drainage hole F2 extends toward the first drainage hole F1, and after approaching, it is constructed with a second opening angle, which is different from the first opening angle.

10. The method according to claim 9, characterized in that The first opening inclination angle and the second opening inclination angle are both arranged obliquely upward.

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