Advanced water diversion and drainage method for tunnel

Abstract

The invention relates to a tunnel advanced water diversion and drainage method which comprises the steps that a transient electromagnetic method is adopted to detect a tunnel, and the underground water distribution condition and the water-rich degree in front of the tunnel are obtained according to the detection result of the transient electromagnetic method; according to the underground water distribution condition and the water-rich degree, advance drilling is carried out on the front tunnel section of the tunnel, so that a water diversion hole channel communicated with a water-rich area is formed in the front tunnel section; and underground water in the water-rich area is drained and depressurized through the water diversion hole channels. The tunnel is detected through a transient electromagnetic method, advanced drilling is carried out according to the detection result, and a water diversion channel is formed; the water diversion channel is used for conducting advanced drainage and pressure release on dissolved cavity accumulated water, crack water and the like of the non-excavated hole section; therefore, advanced water diversion and drainage of the tunnel are achieved, on the premise that an existing construction technology of the tunnel is not changed, the risk of water burst and mud burst in the subsequent tunnel section excavation process is effectively reduced, and tunnel construction safety is guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of tunnel construction, and particularly to a method for advanced drainage of tunnels. Background Art

[0002] Underground excavation construction is often used in civil engineering, that is, instead of excavating the ground surface, construction is carried out by digging holes underground. The seepage water volume of conventional tunnels is small, which has little impact on tunnel construction, and normal pumping drainage in the tunnel can be carried out. However, for projects with high groundwater levels and large water inflows, during the tunnel construction process, there is a risk of water inrush and mud burst, and the construction safety risk is prominent. Summary of the Invention

[0003] Based on this, it is necessary to overcome the defects of the prior art and provide a method for advanced drainage of tunnels, which can reduce the risk of water inrush and mud burst and lower the construction safety risk.

[0004] A method for advanced drainage of tunnels includes:

[0005] Using the transient electromagnetic method to detect the tunnel, and obtaining the groundwater distribution and water-rich degree in front of the tunnel according to the detection results of the transient electromagnetic method;

[0006] According to the groundwater distribution and water-rich degree, perform advanced drilling on the front section of the tunnel, so as to form a water diversion channel connecting the water-rich area in the front section;

[0007] Drain and relieve the pressure of the groundwater in the water-rich area through the water diversion channel.

[0008] In one embodiment, before the step of using the transient electromagnetic method to detect the tunnel, it further includes:

[0009] Perform advanced geological prediction to preliminarily detect the groundwater distribution and water-rich degree in front of the tunnel;

[0010] When the preliminary detection result meets the requirements, enter the step of using the transient electromagnetic method to detect the tunnel; when the preliminary detection result does not meet the requirements, perform an excavation operation on the front section.

[0011] In one embodiment, the drilling depth of the advanced drilling is 20m to 60m; and / or, the drilling diameter of the advanced drilling is 50mm to 200mm.

[0012] In one embodiment, the extending direction of the advanced drilling is set at an angle with the central axis of the tunnel.

[0013] In one embodiment, the advanced drilling holes extend obliquely forward from the face of the tunnel and extend to an area outside the excavation contour line of the tunnel; the included angle between the extension direction of the advanced drilling holes and the central axis of the tunnel is 5° to 20°.

[0014] In one embodiment, the implementation of the advanced drilling holes for the front section of the tunnel according to the groundwater distribution and water-rich degree specifically includes:

[0015] When the water-rich degree is less than a preset value, one first advanced drilling hole is drilled at the top part of the face and on the left and right opposite sides of the face respectively.

[0016] In one embodiment, when the water-rich degree is greater than the preset value, one first advanced drilling hole is first drilled at the top part of the face and on the left and right opposite sides of the face respectively, and then second advanced drilling holes are opened according to the positions of the water-rich areas. The second advanced drilling holes extend from the face to the water-rich areas.

[0017] In one embodiment, when the number of the water-rich areas is at least two, the number of the second advanced drilling holes is at least two, and each of the second advanced drilling holes is correspondingly arranged with each of the water-rich areas.

[0018] In one embodiment, the step of draining and relieving the pressure of the groundwater in the water-rich area through the water diversion hole channel specifically includes:

[0019] Install a drain pipe at the water outlet end of the water diversion hole channel, and drain the groundwater to the sump through the drain pipe.

[0020] In one embodiment, after the step of draining and relieving the pressure of the groundwater in the water-rich area through the water diversion hole channel, the following steps are further included:

[0021] Pump the water in the sump to the sewage treatment pool, and purify the water in the sewage treatment pool.

[0022] The above-mentioned tunnel advanced drainage method detects the tunnel by the transient electromagnetic method, implements advanced drilling according to the detection results, and forms a water diversion channel; drains and relieves the pressure of the accumulated water in the solution cavity and fissure water in the unexcavated section through the water diversion channel; thus realizing the tunnel advanced drainage, and effectively reducing the risk of water inrush and mud burst during the excavation of the subsequent tunnel section without changing the existing construction technology of the tunnel, ensuring the safety of tunnel construction. Description of the Drawings

[0023] Figure 1 It is a flow chart of the tunnel advanced drainage method according to an embodiment of the present application.

[0024] Figure 2Structural diagram of a tunnel face of a tunnel in an embodiment of the present application, with inspection holes provided thereon.

[0025] Figure 3 Structural diagram of a tunnel face of a tunnel in an embodiment of the present application, with advanced boreholes drilled thereon.

[0026] Figure 4 Structural diagram of an advanced borehole of a tunnel in an embodiment of the present application, with an included angle formed with the central axis.

[0027] Figure 5 Structural diagram of an advanced borehole of a tunnel in an embodiment of the present application, draining groundwater.

[0028] 10. Tunnel; 11. Tunnel face; 12. Inspection hole; 13. Advanced borehole; 131. First advanced borehole; 132. Second advanced borehole; 14. Drain pipe; 15. Sump. Detailed implementation manners

[0029] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0030] Generally speaking, during the construction process of a tunnel, the tunnel excavation operation and the tunnel drilling operation are alternately carried out. That is, before each tunnel excavation operation, the tunnel is first drilled, and then a section of the tunnel is excavated. Among them, the depth of a single drilling is usually matched with the depth of a single tunnel excavation. The excavation depth of the tunnel varies according to specific types. Taking a tunnel in the form of surrounding rock as an example, the depth of a single excavation of the tunnel is usually, for example, 3 m, and the corresponding drilling depth of the tunnel is, for example, 3 m. Of course, there are also cases where deeper drilling is used, and the maximum value of the deepened drilling depth can usually reach 6 m. Through research by the applicant, it is found that there are often errors in the excavation depth of the drilling rig. When the single excavation depth of the tunnel exceeds 3 m, especially for projects with a high groundwater level and a large water inflow, there will be a risk of water inrush and mud burst during the tunnel construction process, and the construction safety risk is prominent.

[0031] Based on this, the present application provides a method for advanced drainage of a tunnel, which can reduce the risk of water inrush and mud burst and lower the construction safety risk.

[0032] Refer to Figure 1 and Figure 5 , Figure 1 shows a flowchart of the method for advanced drainage of the tunnel 10 in an embodiment of the present application. Figure 5The structural diagram of the advanced drilling hole 13 of the tunnel 10 in an embodiment of the present application for draining groundwater. A method for advanced drainage of a tunnel 10 provided in an embodiment of the present application includes:

[0033] Step S100: Detect the tunnel 10 by using the transient electromagnetic method, and obtain the groundwater distribution and water-rich degree in front of the tunnel 10 according to the detection results of the transient electromagnetic method;

[0034] It should be noted that the transient electromagnetic method (Time domain electromagnetic methods, abbreviated as TEM) is to utilize the eddy current field effect generated by a conductive medium under the excitation of a step-changed electromagnetic field, and use the CUGTEM-GKⅡ transient electromagnetic instrument to observe the strength, spatial distribution characteristics and time characteristics of the electromagnetic field generated by this eddy current. This instrument is particularly sensitive to low-resistance water-filled fractured zones, has a small volume effect, high longitudinal and transverse resolution, and is fast in construction and high in efficiency. It can be used not only in front of the tunneling face, but also for detecting the sidewalls, the top, and the floor of the tunnel, providing a technical means for the advanced prediction and forecast of water hazards and water-conducting structures during the production process, and can also be applied to the advanced prediction of tunnel water hazards with complex working conditions and large noise interference.

[0035] Step S200: According to the groundwater distribution and water-rich degree, implement advanced drilling holes 13 in the front section of the tunnel 10, so as to form a water diversion channel connecting the water-rich area in the front section;

[0036] Specifically, during the construction process of the tunnel 10, the advanced drainage method of the tunnel 10 in this embodiment is carried out in multiple times, and is alternately reciprocated with the excavation of the tunnel 10. Specifically, the single-time advanced drainage method of the tunnel 10 is implemented before the single-time excavation action of the tunnel 10. In this way, before each excavation action of the tunnel 10, drill holes are formed in the front section of the tunnel 10, and the water in the water-rich area in front of the tunnel 10 is drained outwards, so as to be able to drain water in advance, reduce the risk of water inrush, prevent the tunnel 10 from being flooded, and achieve the early elimination of potential safety hazards.

[0037] Exemplarily, the drilling depth of the advanced drilling hole 13 includes but is not limited to 20m to 60m, specifically, for example, 20m, 25mm, 30m, 35m, 40mm, 50m or 60m, etc., which can be flexibly adjusted and set according to actual needs and are not limited herein. In this way, the drilling depth is relatively deep, greater than the 6m drilling depth in the related technology, so it has a better drainage effect, realizes advanced drainage, effectively reduces the risk of water inrush during the construction of the tunnel 10, prevents the tunnel from being flooded, and eliminates potential safety hazards in advance.

[0038] Optionally, the borehole diameter of the advanced borehole 13 includes but is not limited to 50 mm to 200 mm, specifically for example 50 mm, 70 mm, 100 mm, 110 mm, 150 mm or 200 mm, and can be specifically adjusted and set flexibly according to the actual situation, and is not limited herein. In this way, the borehole diameter of the advanced borehole 13 is relatively large, which can facilitate the rapid drainage of groundwater and achieve the drainage of most of the groundwater; in addition, the borehole diameter of the advanced borehole 13 is not too large to cause excessive resistance during the operation and make it impossible to carry out.

[0039] It should be noted that the "advance" of the advanced borehole 13 in this embodiment is referenced to the normal excavation direction of the tunnel 10. The borehole depth of the tunnel 10 is relatively deep, and the borehole depth is greater than the conventional borehole depth of the tunnel in the related art.

[0040] Step S300: Drain and relieve the pressure of the groundwater in the water-rich area through the water diversion channel.

[0041] The above-mentioned tunnel 10 advanced water drainage method detects the tunnel 10 by the transient electromagnetic method, implements the advanced borehole 13 according to the detection result, and forms a water diversion channel; through the water diversion channel, the accumulated water in the solution cavity and fissure water in the unexcavated section are advanced to drain and relieve the pressure; thus realizing the advanced water drainage of the tunnel 10, and effectively reducing the risk of water inrush and mud burst during the subsequent excavation of the tunnel section without changing the existing construction technology of the tunnel 10, and ensuring the construction safety of the tunnel 10.

[0042] Exemplarily, before the step of detecting the tunnel 10 by the transient electromagnetic method, it further includes:

[0043] Step S80: Conduct advanced geological prediction to preliminarily detect the groundwater distribution and water-rich degree in front of the tunnel 10;

[0044] Optionally, the advanced geological prediction in this embodiment is specifically the TGS360pro advanced geological prediction.

[0045] Among them, the TGS360pro advanced geological prediction is the only method that uses the seismic wave principle to simultaneously conduct three-dimensional advanced water detection and geological prediction. By multiple seismic sources exciting seismic waves multiple times, the generated reflected waves are received by multiple three-dimensional geophones, so as to obtain the geological information data volume of the cone in front of the detection (the cone angle is 45°). By calculating and analyzing the collected reflected wave information, the stress drop of the dynamic stress field of the surrounding rock in front can be obtained. According to the distribution law of the stress drop, a three-dimensional data volume of multiple rock mass parameters can be obtained. Based on this parameter image, the rock layer separation elements can be effectively identified (the vertical area of the damaged rock layer material corresponds to different geodynamic states of the block contact), and the dangerous situations in front of the tunnel such as water inrush, collapse, water-bearing area and fracture zone can be discriminated through the processed image.

[0046] Optionally, the seismic source includes, but is not limited to, a vibrator that transmits vibrations to the front section of the tunnel 10.

[0047] Optionally, three-dimensional geophones are used to collect the vibration beams of the surrounding rock. The number of three-dimensional geophones is, for example, 6 to 10, and the specific number can be adjusted and set according to the actual situation and is not limited herein. In this embodiment, as Figure 2 shown, the number of three-dimensional geophones is, for example, 6. There are 6 detection holes 12 provided on the face 11 of the tunnel 10, and the depth of the detection holes 12 is, for example, 30 cm to 70 cm. The 6 detection holes 12 are arranged in one-to-one correspondence with the 6 three-dimensional geophones.

[0048] According to the different surrounding rocks, the axial prediction distance of the TGS360pro advanced geological prediction is generally 100 m to 200 m, and the radial prediction range is generally 40 m to 100 m. Therefore, it can not only detect the groundwater distribution and water-rich degree in all areas within the contour line of the axial section of the tunnel 10, but also detect the area within 50 m outside the contour line.

[0049] Step S90: Determine whether the preliminary detection result meets the requirements.

[0050] Specifically, when the preliminary detection result meets the requirements, it enters the step of detecting the tunnel 10 using the transient electromagnetic method, that is, enters step S100; when the preliminary detection result does not meet the requirements, the excavation operation can be carried out on the front section of the tunnel.

[0051] Optionally, the preliminary detection result includes, for example, the water-rich degree of the groundwater. The water-rich degree is related to the moisture content. The greater the water-rich degree, the higher the moisture content; the lower the water-rich degree, the lower the moisture content.

[0052] Specifically, when the water-rich degree of the groundwater is greater than the set value, that is, the preliminary detection result meets the requirements, the front section of the tunnel 10 is initially determined to be a water-rich tunnel section. Therefore, it enters step S100, and the water-rich tunnel 10 is detected again by the transient electromagnetic method to further analyze the groundwater distribution and water-rich degree, so as to more accurately obtain the groundwater distribution and water-rich degree in front of the tunnel 10; conversely, when the water-rich degree of the groundwater is less than the set value, that is, the water-rich degree of the groundwater in front of the tunnel 10 decreases and the preliminary detection result does not meet the requirements, there is no need for advanced drainage operation, and the excavation operation of the tunnel 10 can be directly carried out.

[0053] Exemplarily, please refer to Figures 3 to 5 wherein, the extending direction of the advanced borehole 13 is set at an angle with the central axis of the tunnel 10. Among them, the central axis of the tunnel 10 is as Figure 4as shown by Z therein. Specifically, the included angle includes but is not limited to 0° to 20°, such as 0°, 5°, 10°, 12°, 15° or 20° etc.

[0054] When the included angle is 0°, that is, the extending direction of the advance borehole 13 is arranged parallel to the central axis of the tunnel 10; when the included angle is greater than 0°, for example, 10°, the drainage end of the advance borehole 13 can be arranged close to the central axis of the tunnel 10, and drilling starts from a position close to the central axis of the tunnel 10, making the operation easier; the water inlet end of the advance borehole 13 is relatively far from the central axis of the tunnel 10, so as to realize the drainage treatment of groundwater in more areas deviating from the central axis position.

[0055] Please refer to Figure 3 and Figure 4 In a specific embodiment, the advance borehole 13 extends obliquely forward from the face 11 of the tunnel 10 and extends to an area outside the excavation contour line of the tunnel 10. The included angle between the extending direction of the advance borehole 13 and the central axis of the tunnel 10 is 5° to 20°. In this way, the water inlet end of the advance borehole 13 can extend to an area outside the excavation contour line according to actual needs, so as to realize the drainage and pressure relief operation of groundwater in the area outside the excavation contour line, further reducing the risk of water inrush and mud burst during the subsequent excavation of the tunnel section and ensuring the construction safety of the tunnel 10.

[0056] Exemplarily, implementing the advance borehole 13 for the front section of the tunnel 10 according to the groundwater distribution and water-rich degree specifically includes:

[0057] When the water-rich degree is less than the preset value, a first advance borehole 131 is drilled at the top part of the face 11 and on the left and right opposite sides of the face 11 respectively. In this way, the number of the first advance boreholes 131 is three in total, and the three first advance boreholes 131 extend into the tunnel from different parts of the face 11, realizing the drainage of groundwater in different parts of the tunnel and having a good drainage effect.

[0058] Among them, the preset value can be flexibly adjusted and set according to actual needs, which is not limited herein. Specifically, it can be set according to whether there is gushing water and whether there is water inrush. In this embodiment, when the water-rich degree is less than the preset value, there is no gushing water in the front section of the tunnel, nor is there water inrush, and the moisture content is low. In other words, when the water-rich degree is greater than the preset value, there is gushing water in the front section of the tunnel, and / or there is water inrush, and the moisture content is high.

[0059] Optionally, the extending direction of the first advance borehole 131 is set at an included angle with the central axis of the tunnel 10.

[0060] Specifically, the water inlet end of the first advanced borehole 131 extends to the periphery of the excavation outline, which can not only drain the groundwater within the excavation outline, but also drain the groundwater outside the excavation outline.

[0061] Exemplarily, when the water-rich degree is greater than a preset value, first, a first advanced borehole 131 is drilled at the top of the heading face 11 and on the left and right opposite sides of the heading face 11 respectively, and then a second advanced borehole 132 is opened according to the position of the water-rich area, and the second advanced borehole 132 extends from the heading face 11 to the water-rich area.

[0062] Exemplarily, when the number of water-rich areas is at least two, the number of the second advanced boreholes 132 is at least two, and each of the second advanced boreholes 132 is correspondingly arranged with each water-rich area.

[0063] Please refer to Figure 5 , exemplarily, the steps of draining and relieving the pressure of the groundwater in the water-rich area through the water diversion channel specifically include: installing a drain pipe 14 at the water outlet end of the water diversion channel, and draining the groundwater into the sump 15 through the drain pipe 14.

[0064] The sump 15 is a concave pit arranged outside the tunnel 10 for collecting groundwater. The volume of the sump 15 is not limited. For example, it is 5m 3 , 10m 3 or 20m 3 and so on. The specific volume can be flexibly adjusted and set according to the actual site space conditions and requirements.

[0065] Exemplarily, after the steps of draining and relieving the pressure of the groundwater in the water-rich area through the water diversion channel, it further includes:

[0066] Step S400, pumping the water in the sump 15 into the sewage treatment pool and purifying the water in the sewage treatment pool.

[0067] In the description of the present application, it should be understood that if there appear such terms as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0068] In addition, if the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plural" appears, the meaning of "plural" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0069] In this application, unless otherwise clearly defined and limited, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0070] In this application, unless otherwise clearly defined and limited, if there is a description such as a first feature being "on" or "under" a second feature, the meaning may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0071] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0072] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0073] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A method for advanced drainage of a tunnel, characterized in that Including: Detecting a tunnel by using the transient electromagnetic method, and obtaining the groundwater distribution and water-rich degree in front of the tunnel according to the detection result of the transient electromagnetic method; According to the groundwater distribution and water-rich degree, implementing an advanced drilling in the front section of the tunnel, so as to form a water diversion channel connecting the water-rich area in the front section; Draining and relieving the pressure of the groundwater in the water-rich area through the water diversion channel.

2. The method for advanced drainage of a tunnel according to claim 1, characterized in that, Before the step of detecting the tunnel by using the transient electromagnetic method, it further includes: Conducting an advanced geological prediction to preliminarily detect the groundwater distribution and water-rich degree in front of the tunnel; When the preliminary detection result meets the requirements, entering the step of detecting the tunnel by using the transient electromagnetic method; when the preliminary detection result does not meet the requirements, conducting an excavation operation on the front section.

3. The method for advanced drainage of a tunnel according to claim 1, characterized in that The drilling depth of the advanced drilling is 20m to 60m; and / or, the drilling diameter of the advanced drilling is 50mm to 200mm.

4. The method for advanced drainage of a tunnel according to claim 1, characterized in that The extending direction of the advanced drilling is arranged at an angle with the central axis of the tunnel.

5. The tunneling advanced drainage method according to claim 4, characterized in that, The advanced drilling extends obliquely forward from the face of the tunnel and extends to an area outside the excavation contour line of the tunnel; the included angle between the extending direction of the advanced drilling and the central axis of the tunnel is 5° to 20°.

6. The method for advanced drainage of a tunnel according to claim 1, characterized in that, The specific implementation of the advanced drilling in the front section of the tunnel according to the groundwater distribution and water-rich degree specifically includes: When the water-rich degree is less than a preset value, a first advanced drilling is drilled at the top of the face and on the left and right opposite sides of the face respectively.

7. The method for advanced drainage of a tunnel according to claim 6, wherein When the water-rich degree is greater than a preset value, first a first advanced drilling is drilled at the top of the face and on the left and right opposite sides of the face respectively, and then a second advanced drilling is opened according to the position of the water-rich area, and the second advanced drilling extends from the face to the water-rich area.

8. The method for advanced drainage of a tunnel according to claim 7, characterized in that When the number of the water-rich areas is at least two, the number of the second advanced drillings is at least two, and each of the second advanced drillings is correspondingly arranged with each of the water-rich areas.

9. The method for advanced drainage of a tunnel according to claim 1, wherein The specific step of draining and relieving the pressure of the groundwater in the water-rich area through the water diversion channel specifically includes: Installing a drain pipe at the water outlet end of the water diversion channel, and draining the groundwater to a sump through the drain pipe.

10. The method for advanced drainage of a tunnel according to claim 9, characterized in that, After the step of draining and relieving the pressure of the groundwater in the water-rich area through the water diversion channel, it further includes: Pumping the water in the sump to a sewage treatment pool, and purifying the water in the sewage treatment pool.

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