Hole sealing method for water burst of confined aquifer of coal seam floor

Abstract

The invention discloses a hole sealing method for water gushing of a confined water layer of a coal seam floor. The hole sealing method comprises the steps that S1, an excavation area is divided on the coal seam floor, and a water gushing drill hole is located in the excavation area; s2, the excavation area is excavated downwards to a bedrock layer; s3, the water inlet end of a drainage pipe is inserted into the drill hole, the water outlet end of the drainage pipe is arranged outside the drill hole, and gushing water in the drill hole is drained through the drainage pipe; s4, a gap between the outer side wall of the drainage pipe and the inner wall of the drill hole is filled with a blocking agent; s5, when the gap to be filled does not leak water, a valve is installed at the water outlet end of the drainage pipe; and S6, the valve is tightened, and hole sealing is achieved. The safety and construction efficiency of drilling operation or stripping operation are improved, damage to the environment is reduced, high flexibility is achieved, adjustment can be carried out according to the actual site situation, such as encryption plugging and smooth plugging work guaranteeing, and normal production operation of an open pit coal mine is effectively guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine drilling hole sealing, and particularly relates to a hole sealing method for water gushing of a coal seam floor confined water layer. BACKGROUND

[0002] With the continuous development of open-pit mining of coal mines, the problem of water gushing of a coal seam floor confined water layer is increasingly prominent, and has become an important factor affecting the safety and efficiency of coal mine production. In the process of open-pit mining of coal mines, slope geological drilling is an indispensable link, however, when the drilling reaches the confined water layer, water gushing phenomenon is easily caused. If effective hole sealing measures are not taken, the water body of the confined water layer may gush out along the drilling channel, causing safety hazards to the mining working face and internal drainage working face, and even leading to the stop of production. The sealing methods in the related art have limitations in dealing with the problem of water gushing of the confined water layer, and cannot meet the needs of sealing of the confined water in a complex geological environment. SUMMARY

[0003] The present application aims to at least partially solve one of the technical problems in the related art.

[0004] To this end, an embodiment of the present application provides a hole sealing method for water gushing of a coal seam floor confined water layer.

[0005] The hole sealing method for water gushing of a coal seam floor confined water layer provided by the embodiment of the present application comprises: S1, dividing a digging area on a coal seam floor, and locating a water gushing drilling hole in the digging area; S2, digging downward to a bedrock layer in the digging area; S3, inserting a water inlet end of a drainage pipe into the drilling hole, and setting a water outlet end of the drainage pipe outside the drilling hole, and using the drainage pipe to discharge water gushing in the drilling hole; S4, filling a sealing agent in a gap between an outer side wall of the drainage pipe and an inner wall of the drilling hole; S5, when the filled gap does not leak, installing a valve at the water outlet end of the drainage pipe; S6, tightening the valve to realize hole sealing.

[0006] In some embodiments, in step S1, accumulated water at a construction site should be promptly pumped out to ensure construction conditions, plan and arrange a suitable work area, and perform necessary slope treatment to ensure that the digging equipment and sealing equipment can smoothly enter and exit the site.

[0007] In some embodiments, in step S3, a drainage device is arranged at the water outlet end of the drainage pipe to continuously drain water, preventing accumulated water in the drilling hole from affecting the sealing effect.

[0008] In some embodiments, the drain pipe is a right-angle pipe, which includes a vertical first pipe segment and a second pipe segment, at least part of the first pipe segment is inserted into the borehole, and the second pipe segment is located outside the borehole.

[0009] In some embodiments, the valve is arranged on the second pipe segment.

[0010] In some embodiments, after the gap between the outer wall of the drain pipe and the inner wall of the borehole is filled with the sealing agent, the opening of the valve is adjusted to control the water flow of the drain pipe.

[0011] In some embodiments, before step S4, the bedrock layer is continuously excavated to a hard rock layer.

[0012] In some embodiments, in step S4, the sealing agent includes marl and cement, and the marl is first filled into the borehole, and then the cement is filled into the borehole.

[0013] In some embodiments, in step S4, a quick-setting agent is added to the marl and cement.

[0014] In some embodiments, in step S4, the wind is less than or equal to 8 levels, the weather temperature is less than or equal to 4°C, and the rainfall is less than moderate rain.

[0015] The hole sealing method for coal seam floor confined water layer water inrush of the embodiment mainly aims at the problem that after the coal mine drilling sampling, the water inrush caused by the underground confined water layer cannot be sealed, uses a drain pipe to drain the water inrush in the borehole, uses a sealing agent between the drain pipe and the inner wall of the borehole, quickly realizes efficient sealing, and finally uses a valve to seal the drain pipe. The hole sealing method for coal seam floor confined water layer water inrush of the embodiment can adapt to various complex geological conditions of water inrush, improve the safety and construction efficiency of drilling operation or stripping operation, reduce the damage to the environment, has high flexibility, can be adjusted according to the actual situation on site, ensures the smooth progress of the sealing work, and effectively guarantees the normal production operation of the open-pit coal mine. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a flowchart of the hole sealing method for coal seam floor confined water layer water inrush of the embodiment.

[0017] Figure 2 is a structural diagram of the hole sealing for coal seam floor confined water layer water inrush of the embodiment.

[0018] REFERENCE NUMERALS: 1, bottom plate; 2, drill hole; 3, bedrock layer; 4, drainage pipe; 401, first pipe section; 402, second pipe section; 5, gap; 6, valve; 7, hard rock layer; 8, confined water layer; 9, excavating equipment. DETAILED DESCRIPTION

[0019] Embodiments of the present application are described in detail below with reference to examples shown in the accompanying drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0020] With the continuous development of open-pit mining of coal mines, the water inrush problem of the coal seam floor 1 confined water layer 8 is increasingly prominent, becoming an important factor affecting the safety and efficiency of coal mine production. In the process of open-pit mining of coal mines, slope geological drilling is an essential link, however, when the drill hole 2 reaches the confined water layer 8, water inrush phenomenon is easily caused. If effective hole sealing measures are not taken, the water body of the confined water layer 8 may gush out along the channel of the drill hole 2, causing safety hazards to the mining working face and internal drainage working face, and even leading to the stop of production. The plugging method in the related art has limitations in dealing with the water inrush problem of the confined water layer 8, and cannot meet the needs of confined water plugging in complex geological environments.

[0021] As shown in Figure 1 and Figure 2 , the hole sealing method for water inrush of the coal seam floor confined water layer of the present embodiment comprises: S1, dividing the excavating area on the coal seam floor 1 and the water inrush drill hole 2 is located in the excavating area. First, determine the position of the water inrush drill hole 2, and divide it in the excavating area, so that the water inrush area can be processed in a targeted manner.

[0022] S2, excavating downward to the bedrock layer 3 in the excavating area; excavating to the bedrock layer 3 provides a stable operation platform for subsequent drainage and plugging work. The water inrush from the inside of the drill hole 2 is guided to the outside through the drainage pipe 4, which can effectively reduce the water pressure inside the drill hole 2 and prevent the gushing of the water body.

[0023] S3, inserting the water inlet end of the drainage pipe 4 into the drill hole 2, and arranging the water outlet end of the drainage pipe 4 outside the drill hole 2, and using the drainage pipe 4 to discharge the water inrush in the drill hole 2; S4, filling the gap 5 between the outer side wall of the drainage pipe 4 and the inner wall of the drill hole 2 with a plugging agent; filling the gap 5 between the outer side wall of the drainage pipe 4 and the inner wall of the drill hole 2 with a plugging agent, which can further prevent water flow through the drill hole 2.

[0024] S5, after the filled gap 5 does not leak, installing a valve 6 at the water outlet end of the drainage pipe 4, preparing for the final hole sealing.

[0025] S6, tighten the valve 6 to realize the hole sealing, so as to completely prevent the water inrush of the confined water layer 8.

[0026] The hole sealing method for water inrush of the coal seam floor confined water layer in the embodiment of the application mainly aims at the problem that the water inrush caused by the underground confined water layer 8 cannot be sealed after the coal mine drilling and sampling, adopts the drainage pipe 4 to drain the water inrush in the drilling hole 2, adopts the plugging agent between the inner wall of the drainage pipe 4 and the drilling hole 2, rapidly realizes the efficient plugging, and finally utilizes the valve 6 to plug the drainage pipe 4. The hole sealing method for water inrush of the coal seam floor confined water layer in the embodiment of the application can adapt to various complex geological conditions of water inrush, improve the safety and construction efficiency of drilling operation or stripping operation, reduce the damage to the environment, has higher flexibility, can be adjusted according to the actual situation on site, ensures the smooth progress of the plugging work, and effectively guarantees the normal production operation of the open-pit coal mine.

[0027] In some embodiments, in step S1, the accumulated water in the construction site should be pumped out in time to ensure the construction conditions, plan and arrange the appropriate operation area, and perform necessary slope treatment to ensure that the excavating equipment 9 and the plugging equipment can smoothly enter and exit the site.

[0028] In the construction site, accumulated water may be formed due to water inrush or other reasons. Pumping out the accumulated water in time is to ensure that the operation conditions of the construction site meet the safety requirements. If the accumulated water is not pumped out in time, it may cause inconvenience to the construction personnel, unstable operation of the equipment, and even safety accidents such as short circuit of electrical appliances. The safety of the construction site is ensured, the safety accidents caused by accumulated water are reduced, and the construction efficiency is improved. Before the hole sealing operation, the operation area needs to be reasonably planned and arranged. This includes cleaning obstacles, marking safety boundaries and operation channels, etc., to ensure that the excavating equipment 9 and the plugging equipment can efficiently enter and exit the operation area.

[0029] Improving the organization of the construction site reduces the confusion and interference in the operation, which helps to improve the operation efficiency. Slope treatment is performed around the excavating area to increase the stability of the excavating area and prevent safety accidents such as slope landslide. Slope treatment usually involves reinforcement and stabilization measures for the slope, which is particularly important for open-pit mining. The stability of the excavating area is improved, the safety of the excavating equipment 9 and the operation personnel is ensured, and the potential risks caused by unstable slope are reduced.

[0030] In some embodiments, in step S3, a drainage device is arranged at the water outlet end of the drainage pipe 4 to continuously drain water, preventing the accumulated water in the drilling hole 2 from affecting the plugging effect.

[0031] During the plugging operation, water inrush inside the borehole 2 can continue to occur. If only relying on the natural drainage of the drain pipe 4, the water inside the borehole 2 can accumulate due to insufficient drainage speed, thereby affecting the filling and plugging effect of the plugging agent. The accumulated water can dilute the plugging agent, reducing its solidification and plugging effect. In addition, the accumulated water can also cause the plugging agent to fail to fully fill all the cracks 5 in the borehole 2, leaving water seepage channels.

[0032] By setting the drainage equipment, the continuity and efficiency of the drainage process can be ensured, the water inside the borehole 2 can be prevented from accumulating, and good conditions for the plugging operation can be provided. The drainage equipment can be a water pump, a drain tank or other devices that can improve the drainage efficiency. These devices can be selected and adjusted according to the size and speed of the water inrush to ensure that the water inside the borehole 2 can be drained in time. The degree of automation of drainage is improved, the burden of manual operation is reduced, and the risk of plugging failure caused by water accumulation in the borehole 2 is also reduced. Through continuous drainage, it can be ensured that the plugging agent can play the best effect in the environment without water accumulation interference, and the success rate and quality of plugging are improved.

[0033] In some embodiments, the drain pipe 4 is a right-angle pipe, which includes a vertical first pipe segment 401 and a second pipe segment 402, at least part of the first pipe segment 401 is inserted into the borehole 2, and the second pipe segment 402 is located outside the borehole 2.

[0034] The right-angle pipe is composed of two pipe segments, the first pipe segment 401 is vertical, and the second pipe segment 402 is also vertical but at a 90-degree angle with the first pipe segment 401. This structure allows the first pipe segment 401 to be inserted into the borehole 2, while the second pipe segment 402 is located outside the borehole 2. The design of the right-angle pipe can more effectively adapt to the geometry of the borehole 2 and allow the drainage system to be more compactly installed in limited space. The position of the second pipe segment 402 allows the drainage equipment to be flexibly arranged and is not limited by the position of the borehole 2, facilitating maintenance and management. The structure of the right-angle pipe is relatively simple, and the installation process is also relatively simple, which is conducive to reducing the construction difficulty and improving the construction speed.

[0035] In some embodiments, the valve 6 is provided on the second pipe segment 402.

[0036] The valve 6 is installed on the second pipe section 402, i.e., outside the borehole 2. Such a design allows the operator to operate the valve 6 in a safe condition without directly contacting the environment inside the borehole 2, improving the safety of the operation and reducing the risk of accidental injury caused by operating the valve 6. Through the valve 6, the operator can control the flow rate and pressure of the drainage, which is crucial for maintaining stability and sealing effect during the sealing process. During the injection and solidification of the sealing agent, the water accumulation inside the borehole 2 can be controlled by adjusting the valve 6, ensuring that the sealing agent can fully fill the borehole 2 and achieve the best effect. Installing the valve 6 on the second pipe section 402 also facilitates routine maintenance and inspection of the valve 6, ensuring long-term stable operation of the drainage system, reducing maintenance costs and time, and improving the reliability and maintenance efficiency of the system. In the event of sudden water inrush, the operator can quickly close the valve 6 to prevent a large amount of water from entering the drainage system, thereby protecting the drainage equipment from damage. This enhances the emergency handling capacity of the system and protects the drainage equipment, avoiding possible equipment failure and safety accidents.

[0037] In some embodiments, after the gap 5 between the outer wall of the drainage pipe 4 and the inner wall of the borehole 2 is filled with the sealing agent, the opening of the valve 6 is adjusted to control the water flow rate of the drainage pipe 4.

[0038] After filling the sealing agent, the water flow rate in the drainage pipe 4 can be precisely controlled by adjusting the opening of the valve 6. This ensures that the sealing agent is not washed away or diluted by excessive water flow before it fully solidifies in the borehole 2. This improves the solidification efficiency and sealing quality of the sealing agent, avoiding the risk of sealing failure.

[0039] During the solidification of the sealing agent, appropriate water flow can help maintain stable pressure inside the borehole 2, preventing the sealing agent from cracking or cavitation due to water flow impact. By precisely controlling the water flow, the uniformity and integrity of the sealing layer can be ensured, thereby improving the sealing effect. If the water flow rate of the drainage pipe 4 is too large, it may cause the pressure inside the borehole 2 to drop rapidly, leading to premature solidification and shrinkage of the sealing agent, affecting the quality of the sealing layer. By adjusting the valve 6, excessive drainage can be avoided, ensuring that the sealing agent solidifies under appropriate conditions. Different water inrush rates of the borehole 2 require different drainage strategies. By adjusting the opening of the valve 6, the drainage rate can be adjusted according to the actual water inrush rate to maintain the stability of the sealing process. This enhances the adaptability of the sealing operation, enabling it to cope with a variety of different working conditions.

[0040] In some embodiments, before step S4, the bedrock layer 3 is further excavated downward to the hard rock layer 7.

[0041] Although the bedrock layer 3 is relatively hard, it may have cracks or not be strong enough to provide sufficient support against the pressure of the confined water layer 8. Continuing to dig down to the hard rock layer 7 can ensure the stability and long-term effectiveness of the sealing structure. The stability of the sealing structure is improved, and the risk of sealing failure due to a weak foundation is reduced. The hard rock layer 7 as a more stable support surface can enhance the fixing effect of the sealing agent, preventing the sealing agent from moving or deforming due to groundwater pressure. The durability and reliability of the sealing layer are ensured, and the success rate of sealing is improved. The hard rock layer 7 can better block the water inflow of the confined water layer 8, reducing the interference of water flow on the sealing process. Uncertainties in the sealing process are reduced, and the smooth progress of the sealing operation is improved. Sealing operations on the hard rock layer 7 can reduce the risk of construction caused by water inflow, ensuring the safety of workers and enhancing the safety level of the construction site, reducing the occurrence of safety accidents.

[0042] In some embodiments, in step S4, the sealing agent includes marlite and cement, and the marlite is first filled into the borehole 2, and then the cement is filled into the borehole 2.

[0043] Marlite is a high-molecular polymer material with the characteristics of rapid curing and expansion. It can fill the cracks 5 in the borehole 2 in a short time and form a preliminary sealing layer. The rapid curing and expansion ability of marlite can quickly reduce the water pressure inside the borehole 2, providing a stable environment for subsequent cement filling. Cement is a traditional building material with high strength and durability. After marlite is filled and cured, filling cement can further improve the strength and durability of the sealing layer. The filling of cement can form a solid sealing layer that can resist the pressure of the confined water layer 8 for a long time and prevent water inflow.

[0044] First filling marlite and then filling cement can ensure that the sealing layer is more complete and effective. The rapid filling and curing of marlite can provide a stable filling basis for cement, and the filling of cement can fill the cracks 5 that may not be completely covered by marlite, further improving the quality of the sealing layer. The completeness and effectiveness of the sealing layer are improved, and the possibility of water inflow is reduced. The use of a combined sealing agent of marlite and cement can improve the stability and reliability of the sealing layer, thereby reducing safety accidents during coal mining, enhancing the safety of coal production, and ensuring the safety of workers.

[0045] In some embodiments, in step S4, a quick-setting agent is added to the marlite and cement.

[0046] A quick-setting agent is a chemical additive that can significantly shorten the curing time of materials such as cement. It accelerates the hydration reaction, enabling cement and other sealing materials to achieve sufficient strength in a shorter time. Shortening the curing time of the sealing agent speeds up the sealing process, reducing production delays caused by waiting for curing. After adding the quick-setting agent, the curing speed of the marl and cement is accelerated, and a sealing layer can be quickly formed to prevent water gushing from continuing to affect coal production. It improves the sealing efficiency, reduces the impact of water gushing on production, and ensures the continuity of production. The quick-setting agent not only accelerates the curing, but also improves the performance of the sealing agent, such as increasing its strength and water resistance, thereby enhancing the overall effect of the sealing layer. It improves the quality and durability of the sealing layer, ensuring the long-term effectiveness of the sealing layer. In emergency situations such as sudden large water gushing, adding a quick-setting agent can quickly form a sealing layer to effectively control water gushing and prevent the situation from worsening. It enhances the ability to respond to emergencies and ensures the safety of coal production.

[0047] In some embodiments, in step S4, the wind is less than or equal to 8 levels, the weather temperature is less than or equal to 4°C, and the rainfall is less than moderate rain.

[0048] Strong winds may affect the filling and curing process of the sealing agent. Wind may cause the sealing agent to fly during the filling process, affecting the uniformity and integrity of the filling. In addition, wind may also affect the safety of the operator, increasing the risk of operation. Sealing work in no wind or small wind conditions can ensure accurate filling of the sealing agent, improve sealing effect, and ensure the safety of the operator.

[0049] Rainy weather may cause the sealing agent to be diluted or washed away during the filling process, affecting the curing speed and strength of the sealing agent. In addition, rainwater may also increase the humidity of the sealing area, affecting the performance of the sealing agent. Sealing work in dry weather conditions can ensure the purity and curing effect of the sealing agent, improving the quality of the sealing layer.

[0050] Air temperature has a significant impact on the curing speed of the sealing agent. At lower air temperatures, the curing speed of the sealing agent will slow down, affecting the efficiency of the sealing work. In addition, low temperature may also cause the performance of the sealing agent to decline, affecting the sealing effect. Sealing work in suitable air temperature conditions can ensure rapid curing of the sealing agent, improve sealing efficiency and the quality of the sealing layer. Selecting appropriate weather and air temperature conditions for sealing work can reduce the impact of external environmental factors on the sealing process, improving the safety and reliability of the sealing work. Reducing the risk of sealing failure caused by environmental factors ensures the safety of coal production.

[0051] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0052] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0053] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0055] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terminology "comprising" is used in the disclosure as comprising, but not limited to, any indicated features, integers, steps or components. It is also to be understood that the terminology "comprising" can be replaced by the terminology "consisting of" or "consisting essentially of" in some embodiments or examples.

[0056] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be interpreted as limiting the present disclosure, and the ordinary skilled in the art can make changes, modifications, replacements, and variations to the above-described embodiments within the scope of the present disclosure.

Claims

1. A method for sealing a coal seam floor confined water layer gushing hole, characterized in that, The method comprises the following steps: S1, dividing a mining area on a coal seam floor (1), and a water gushing borehole (2) is located in the mining area; S2, mining downward to a bedrock layer (3) in the mining area; S3, inserting a water inlet end of a drainage pipe (4) into the borehole (2), and a water outlet end of the drainage pipe (4) is arranged outside the borehole (2), and water gushing in the borehole (2) is discharged by using the drainage pipe (4); S4, filling a gap (5) between an outer side wall of the drainage pipe (4) and an inner wall of the borehole (2) with a sealing agent; S5, after the gap (5) is filled, installing a valve (6) at the water outlet end of the drainage pipe (4) when there is no water leakage; S6, tightening the valve (6) to realize hole sealing.

2. The coal seam floor confined water layer water inrush hole sealing method according to claim 1, characterized in that, In step S1, the accumulated water at the construction site should be pumped out in time to ensure the construction conditions, plan and arrange a suitable working area, and perform necessary slope treatment to ensure that the mining equipment and sealing equipment can smoothly enter and exit the site.

3. The coal seam floor confined water layer water inrush hole sealing method according to claim 2, characterized in that, In step S3, a drainage device is arranged at the water outlet end of the drainage pipe (4) to continuously discharge water to prevent the accumulated water in the borehole (2) from affecting the sealing effect.

4. The coal seam floor confined water layer water inrush hole sealing method according to claim 3, characterized in that, The drainage pipe (4) is a right-angle pipe, which comprises a vertical first pipe segment (401) and a second pipe segment (402), at least a part of the first pipe segment (401) is inserted into the borehole (2), and the second pipe segment (402) is located outside the borehole (2).

5. The coal seam floor confined water layer water inrush hole sealing method according to claim 4, characterized in that, The valve (6) is arranged on the second pipe segment (402).

6. The coal seam floor confined water layer water inrush hole sealing method according to claim 5, characterized in that, After the gap (5) between the outer side wall of the drainage pipe (4) and the inner wall of the borehole (2) is filled with the sealing agent, the opening degree of the valve (6) is adjusted to control the water flow of the drainage pipe (4).

7. The coal seam floor confined water layer water inrush hole sealing method according to claim 1, characterized in that, Before step S4, the bedrock layer (3) is continuously mined downward to a hard rock layer (7).

8. The coal seam floor confined water layer water inrush hole sealing method according to claim 1, characterized in that, In step S4, the sealing agent comprises marith and cement, marith is first filled into the borehole (2), and then cement is filled into the borehole (2).

9. The coal seam floor confined water layer water inrush hole sealing method according to claim 7, characterized in that, In step S4, a quick-setting agent is added to the marith and cement.

10. The coal seam floor confined water layer water inrush hole sealing method according to claim 1, characterized in that, In step S4, the wind is less than or equal to 8 levels, the weather temperature is less than or equal to 4°C, and the rainfall is less than moderate rain.

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