Dynamic water tunnel closure method

Abstract

The invention relates to the technical field of underground construction, in particular to a flowing water tunnel closure method, which comprises the following steps of: 1, collecting geological exploration data of a water inrush tunnel; 2, determining a tunnel closure section for constructing the closure wall; 3, water pumping and draining holes and injection holes are formed in the two ends of the ground position of the tunnel closure section; 4, a water flow velocity monitor is arranged downwards in the tunnel at the position of the injection hole, and flowing water in the tunnel is pumped and drained at the position of the water pumping and draining hole; 5, flowing water in the tunnel is continuously pumped and drained at the water pumping and draining hole, and when the flowing speed of the flowing water in the tunnel is monitored to be 0 through a water flow speed monitor, slag throwing, gravel throwing, concrete throwing and grouting operation is conducted at the injection hole; and 6, after the intercepting wall is constructed and solidified, water pumping operation at the water pumping and draining hole is gradually stopped, and the water level change at the water pumping and draining hole is monitored. According to the method, the mode of eliminating water power in advance is adopted, so that it is guaranteed that materials thrown and injected into the tunnel can be effectively connected with the roof, and therefore effective construction of the intercepting wall is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of underground construction, and in particular to a method for intercepting flow in a dynamic water tunnel. Background Art

[0002] When encountering water-containing and water-conducting structures during the excavation process of underground tunnels and roadways, if detection and control are not timely, sudden water gushing accidents often occur, and the tunnels and roadways are flooded, often causing huge economic losses and delays in construction period; when sudden water gushing occurs in tunnels and roadways, building intercepting retaining walls in the tunnels and roadways in a relatively short period of time is a common measure to prevent sudden water gushing from flooding the entire underground space, which can minimize the disaster losses.

[0003] At present, slag dumping, stone dumping, grouting and other methods are often used to construct interception retaining walls for dynamic water tunnels, such as Liu Zongyuan's master's thesis "Experimental Study on Slurry Diffusion in Aggregate Injection with Different Grades in Dynamic Water Tunnel" at China University of Mining and Technology in 2021; the research on the construction technology of interception and water-blocking walls in dynamic water tunnels in mines flooded by sudden water published in the first issue of "Coal Science and Technology" in 2021; the migration law and water-blocking mechanism of slurry in aggregate accumulation of interception tunnels published in the "Journal of Underground Space and Engineering" in 2020; application A method for rapid water blocking of a mine tunnel with water flow is disclosed in the Chinese invention patent with publication number CN118564288A; a visualization test system, test method and application method for simulating grouting and blocking aggregate sections in a mine tunnel with roughness is disclosed in the Chinese invention patent with application publication number CN118362462A; a method for controlling sudden water inrush in a metal mine tunnel by setting up a chamber group is disclosed in the Chinese invention patent with application publication number CN117127938A.

[0004] The conventional method for intercepting water in dynamic tunnels is usually to drill holes on the ground and then throw slag, crushed stone, concrete or grout into the tunnel through the holes to form an interception wall in the tunnel. However, when the hydrodynamic intensity in the tunnel is large and the water flow velocity is high, and the thrown or injected materials are close to the top of the tunnel, the water flow velocity at the top is often too fast, causing the last thrown or injected materials to be washed away, and no effective accumulation can be formed, thereby failing to achieve the goal of building an interception wall. Summary of the invention

[0005] The present invention aims to solve the problem in the prior art that when the materials poured into the tunnel approach the top of the tunnel, the poured materials are easily washed away due to the high hydrodynamic intensity. A method for intercepting a dynamic water tunnel is provided, which eliminates the hydrodynamic force in advance to ensure that the materials poured into the tunnel can effectively connect to the top, thereby realizing the effective construction of an interception wall.

[0006] In order to achieve the above object, the technical solution of the present invention is: a method for intercepting flow in a dynamic water tunnel, comprising the following steps: Step 1: Collect geological survey data on water inrush tunnels.

[0007] Step 2: Determine the tunnel interception section for constructing the interception wall. The tunnel interception section should be a straight tunnel section with the same bottom plate elevation.

[0008] Step 3: Drill drainage holes and injection holes at both ends of the ground in the tunnel diversion section. The drainage holes close to the tunnel water inrush location are the drainage holes, and the injection holes far from the tunnel water inrush location are the injection holes.

[0009] Step 4: lower a water flow rate monitor into the tunnel at the injection hole, the water flow rate monitor monitors the flow rate of the dynamic water in the tunnel; and pump out the dynamic water in the tunnel at the drainage hole.

[0010] Step 5: When the dynamic water in the tunnel is continuously pumped out at the drainage holes and the water flow rate monitor detects that the dynamic water flow rate in the tunnel is 0, that is, the tunnel position corresponding to the injection hole is in a static water state, slag throwing, gravel throwing, concrete throwing and grouting operations are carried out at the injection hole to ensure that the injection material is completely connected to the top and solidified to form a diversion wall.

[0011] Step 6: After the interception wall is constructed and solidified, gradually stop pumping water at the drainage holes and monitor the water level changes at the drainage holes.

[0012] Furthermore, in step 1, the geological survey data of the water-bursting tunnels include the location of the water-bursting tunnels, the flow rate of the water-bursting tunnels and the tunnel construction data, and the tunnel construction data include the cross-sectional specifications, support forms and bottom plate elevations of the constructed tunnels.

[0013] Furthermore, in step 2, the length of the tunnel interception section is not less than 10 times the width of the tunnel bottom plate.

[0014] Furthermore, in step 3, a drilling machine is used to drill drainage holes and injection holes. The diameter of the drainage holes is determined according to the sudden water flow rate of the tunnel. The minimum diameter of the drainage holes is not less than 200 mm, and the minimum diameter of the injection holes is not less than 120 mm. Geological casings are installed inside the drainage holes and the injection holes.

[0015] Furthermore, in step 4, a water flow rate monitor is placed into the tunnel through the drill rod of a drilling machine; and moving water in the tunnel is pumped out by placing a submersible pump in the tunnel at the drainage hole or by arranging a water pump on the ground.

[0016] Furthermore, in step 5, the flow rate of the dynamic water in the tunnel is adjusted, and after the water flow rate monitor monitors that the flow rate of the dynamic water in the tunnel is 0, the water flow rate monitor is taken out of the tunnel through the drill rod of the drilling machine, and then slag throwing, gravel throwing, concrete throwing and grouting operations are carried out.

[0017] Furthermore, in step 6, if the water level at the drainage hole rises slowly and there is water leakage at the interception wall, the drainage operation is continued, and slag, gravel, concrete and grouting operations are continued using the injection holes until a watertight interception wall is constructed.

[0018] Through the above technical solution, the beneficial effects of the present invention are: The present invention realizes the effective construction of the interception wall by eliminating the hydrodynamic force in advance. By the process of pumping out the dynamic water in the tunnel, the hydrodynamic force strength of the interception wall construction section can be eliminated, and the scouring of the injected materials by the dynamic water in the tunnel can be weakened, so as to avoid the injected materials being washed away due to the high hydrodynamic force, thereby ensuring the effective construction of the interception wall.

[0019] The present invention drills drainage holes and injection holes at the ground position of the tunnel interception section, pumps out the dynamic water in the tunnel at the drainage holes, and monitors the dynamic water flow rate in the tunnel through a water flow rate monitor at the injection holes, so that the tunnel position corresponding to the injection holes is in a static water state, so that when slag throwing, gravel throwing, concrete throwing and grouting operations are carried out at the injection holes, the injected materials are prevented from being washed away by dynamic water, thereby achieving the effect of effectively constructing the interception wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the dynamic water flow route of the tunnel of the present invention; Figure 2 The present invention is a schematic structural diagram of a method for intercepting flow in a dynamic water tunnel.

[0021] The numbers in the attached figure are: 1 is a tunnel, 2 is a drainage hole, 3 is an injection hole, and 4 is a cutoff wall. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments: like Figure 1-2 As shown, a method for intercepting flow in a dynamic water tunnel comprises the following steps: Step 1: Collect geological survey data of water-burst tunnel 1. The geological survey data of water-burst tunnel 1 include the location of water-burst tunnel 1, the flow rate of water-burst and the construction data of tunnel 1. The construction data of tunnel 1 include the cross-sectional specifications, support form and bottom plate elevation of the constructed tunnel 1. The geological and hydrogeological data of the water-burst area of ​​tunnel 1 and the strata and composition discovered during construction can also be collected.

[0023] Step 2: Determine the interception section of tunnel 1 for constructing the interception wall 4. Select a straight tunnel section with a consistent bottom plate elevation for the interception section of tunnel 1. At the same time, ensure that the ground drilling site corresponding to the interception section of tunnel 1 is convenient to arrange. The length of the interception section of tunnel 1 is not less than 10 times the width of the bottom plate of tunnel 1.

[0024] Step 3: Drainage holes 2 and injection holes 3 are drilled at both ends of the ground position of the interception section of tunnel 1. The drainage holes 2 are close to the water inrush position of tunnel 1, and the injection holes 3 are far away from the water inrush position of tunnel 1. Specifically, a drilling machine is used to drill the drainage holes 2 and the injection holes 3. The aperture of the drainage hole 2 is determined according to the sudden water flow of tunnel 1. The larger the sudden water flow of tunnel 1, the larger the aperture of the drainage hole 2. The minimum diameter of the drainage hole 2 is not less than 200mm, and the minimum diameter of the injection hole 3 is not less than 120mm. Geological casings are installed inside the drainage holes 2 and the injection holes 3. The purpose of the geological casing is to prevent the drainage holes 2 and the injection holes 3 from collapsing.

[0025] Step 4: lower a water flow rate monitor into the tunnel 1 at the injection hole 3, the water flow rate monitor monitors the flow rate of the dynamic water in the tunnel 1, wherein the water flow rate monitor is placed into the tunnel 1 through the drill rod of the drilling machine; and the dynamic water in the tunnel 1 is pumped out at the drainage hole 2, by placing a submersible pump at the drainage hole 2 downward in the tunnel 1 or arranging a pump on the ground to pump out the dynamic water in the tunnel 1; when a submersible pump is used to pump out the dynamic water in the tunnel 1, the submersible pump is lowered into the dynamic water in the tunnel 1 through the drainage hole 2, and the water outlet end of the submersible pump is connected to the water outlet pipe, and the water outlet pipe passes through the drainage hole 2 and extends to the outside of the tunnel 1; when a pumping pump is used to pump out the dynamic water in the tunnel 1 with negative pressure, the pumping pump is arranged on the ground around the drainage hole 2, the water inlet end of the pumping pump is connected to the drainage pipe, and the drainage pipe passes through the drainage hole 2 and extends to the inside of the tunnel 1.

[0026] Step 5: Adjust the flow rate of the dynamic water in the tunnel 1, continue to pump out the dynamic water in the tunnel 1 at the drainage hole 2, and when the water flow rate monitor detects that the dynamic water flow rate in the tunnel 1 is 0, that is, when the tunnel 1 position corresponding to the injection hole 3 is in a static water state, perform slag throwing, gravel throwing, concrete throwing and grouting operations at the injection hole 3 to ensure that the injected materials are completely connected to the top and solidified to form the interception wall 4. After the water flow rate monitor detects that the dynamic water flow rate in the tunnel 1 is 0, remove the water flow rate monitor from the tunnel 1 through the drill rod of the drilling machine, and then perform slag throwing, gravel throwing, concrete throwing and grouting operations.

[0027] Step 6: After the interception wall 4 is constructed and solidified, gradually stop the pumping operation at the drainage hole 2 and monitor the water level change at the drainage hole 2; if the water level at the drainage hole 2 rises slowly and the interception wall 4 is leaking, continue the pumping and drainage operation, and continue to use the injection hole 3 to throw slag, gravel, concrete and grouting operations until a watertight interception wall 4 is constructed. If the water level at the drainage hole 2 rises slowly, it means that the interception effect of the interception wall 4 is poor. If the water level at the drainage hole 2 rises rapidly, it means that the construction quality and effect of the interception wall 4 are good.

[0028] Compared with the currently commonly used method of only relying on the injection hole 3 to carry out slag throwing, crushed stone throwing, concrete throwing, and grouting operations to build the interception wall 4, the present invention can eliminate the hydrodynamic strength of the construction section of the interception wall 4 and reduce the scouring of the injection materials by the dynamic water of the tunnel 1 through the drainage hole 2, so as to ensure the effective construction of the interception wall 4. The present invention is suitable for the interception of the dynamic water tunnel 1 with large hydrodynamic strength, fast water flow speed and high water pressure.

[0029] The embodiments described above are only preferred embodiments of the invention and are not intended to limit the scope of implementation of the invention. Therefore, any equivalent changes or modifications made according to the technical solutions described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A method for intercepting flow in a dynamic water tunnel, characterized in that: The following steps are involved: Step 1: Collect geological survey data of water inrush tunnel (1); Step 2: Determine the interception section of the tunnel (1) for constructing the interception wall (4), and select a straight tunnel section with a consistent bottom plate elevation for the interception section of the tunnel (1); Step 3: Drilling drainage holes (2) and injection holes (3) at both ends of the ground position of the intercepting section of the tunnel (1), the drainage holes (2) close to the water inrush position of the tunnel (1) being the drainage holes, and the injection holes (3) far from the water inrush position of the tunnel (1); Step 4: placing a water flow rate monitor into the tunnel (1) at the injection hole (3), the water flow rate monitor monitoring the flow rate of the dynamic water in the tunnel (1); and pumping out the dynamic water in the tunnel (1) at the drainage hole (2); Step 5: When the dynamic water in the tunnel (1) is continuously pumped out at the drainage hole (2) and the water flow rate monitor detects that the dynamic water flow rate in the tunnel (1) is 0, that is, the tunnel (1) corresponding to the injection hole (3) is in a static water state, slag throwing, gravel throwing, concrete throwing and grouting operations are performed at the injection hole (3) to ensure that the injected material is completely connected to the top and solidified to form a cutoff wall (4); Step 6: After the interception wall (4) is constructed and solidified, the pumping operation at the drainage hole (2) is gradually stopped, and the water level change at the drainage hole (2) is monitored.

2. A method for intercepting flow in a dynamic water tunnel according to claim 1, characterized in that: In the step 1, the geological survey data of the water-bursting tunnel (1) includes the location of the water-bursting tunnel (1), the flow rate of the water-bursting tunnel (1) and the construction data of the tunnel (1), and the construction data of the tunnel (1) includes the cross-sectional specifications, support form and bottom plate elevation of the constructed tunnel (1).

3. A method for intercepting flow in a dynamic water tunnel according to claim 1, characterized in that: In step 2, the length of the intercepting section of the tunnel (1) is not less than 10 times the width of the bottom plate of the tunnel (1).

4. A method for intercepting flow in a dynamic water tunnel according to claim 1, characterized in that: In step 3, a drilling machine is used to drill a drainage hole (2) and a water injection hole (3). The diameter of the drainage hole (2) is determined according to the sudden water flow rate of the tunnel (1). The minimum diameter of the drainage hole (2) is not less than 200 mm, and the minimum diameter of the water injection hole (3) is not less than 120 mm. Geological casings are installed inside the drainage hole (2) and the water injection hole (3).

5. A method for intercepting flow in a dynamic water tunnel according to claim 4, characterized in that: In step 4, a water flow rate monitor is placed into the tunnel (1) through the drill rod of a drilling machine; and moving water in the tunnel (1) is pumped out by a submersible pump at the drainage hole (2) toward the lower part of the tunnel (1) or by arranging a water pump on the ground.

6. A method for intercepting flow in a dynamic water tunnel according to claim 5, characterized in that: In step 5, the flow rate of the moving water in the pumping tunnel (1) is adjusted, and after the water flow rate monitor monitors that the flow rate of the moving water in the tunnel (1) is 0, the water flow rate monitor is removed from the tunnel (1) by the drill rod of the drilling machine, and then the slag throwing, gravel throwing, concrete throwing and grouting operations are carried out.

7. A method for intercepting flow in a dynamic water tunnel according to claim 1, characterized in that: In step 6, if the water level at the drainage hole (2) rises slowly and there is water leakage at the interception wall (4), the drainage operation is continued, and slag throwing, gravel throwing, concrete throwing and grouting operations are continued using the injection hole (3) until a watertight interception wall (4) is constructed.

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