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Limited drainage method and method for optimizing thickness of grouting circle of tunnel by utilizing limited drainage method

A grouting ring and tunnel technology, which can be used in drainage, design optimization/simulation, earthwork drilling, etc., and can solve the problems of high grouting cost and reduced construction speed.

Active Publication Date: 2020-08-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although increasing the thickness of the grouting ring can reduce the amount of water flowing into the tunnel to a certain extent, this method will cause excessively high grouting costs and reduce the construction speed
[0005] In addition, existing theoretical analysis methods all assume that water from the outside can penetrate into the tunnel lining interior.
However, in fact, due to the use of EVA waterproof panels, the water from the outside cannot directly penetrate into the tunnel through the secondary lining

Method used

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  • Limited drainage method and method for optimizing thickness of grouting circle of tunnel by utilizing limited drainage method
  • Limited drainage method and method for optimizing thickness of grouting circle of tunnel by utilizing limited drainage method
  • Limited drainage method and method for optimizing thickness of grouting circle of tunnel by utilizing limited drainage method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] It is assumed that the size and permeability coefficient of the tunnel support system are known as shown in Table 1. Then for unconstructed tunnels, such as image 3 As shown, the calculation of the thickness of the tunnel grouting circle can be carried out by the formula (23) in the steps 1-3 in the content of the invention, thereby optimizing the grouting thickness of the grouting circle. The specific implementation steps are as follows:

[0083] Table 1 Example 1 Tunnel size and permeability coefficient

[0084]

[0085] Step 1: For a tunnel project, if the water inflow Q is controlled at 3m 3 / d, it will have little impact on the local groundwater ecosystem. First, the water pressure P at the outlet of the traditional horizontal drainage blind pipe is adopted. 1 = 0 when the tunnel waterproof and drainage system.

[0086] Step 2: Set Q=3m 3 / d, P 1 =0kPa and the permeability coefficient of the tunnel in the above table 1 are substituted into the step 1-3 fo...

Embodiment 2

[0093] Taking the Qianying Tunnel in the Heshun-Xingtai Railway Project as an example below, the present invention will be described in detail. Qianying Tunnel is part of the Heshun-Xingtai Railway Project, located at the junction of Zuoquan County, Shaanxi Province and Xingtai City, Hebei Province in northern my country. The tunnel is 11695m long, with a maximum buried depth of 615m and a maximum water inflow of 72850m 3 / (d·m). In order to verify the effect of a limited drainage method of the present invention in controlling water gushing, we conducted a field test in the tunnel between D2K34+500 and D2K43+450 stake numbers, and compared it with the traditional tunnel drainage system. The size and permeability coefficient of the tunnel support system are shown in Table 2, and the specific implementation steps are as follows:

[0094] Table 2 Qianying Tunnel Dimensions and Permeability Coefficient

[0095]

[0096] Step 1: The tunnel between stakes D2K34+500 and D2K43+4...

Embodiment 3

[0102] In order to verify the correctness of the theoretical formula of this technical solution and the effectiveness of tunnel waterproofing and drainage, we used the finite element method (FEM) to conduct numerical simulations, and compared the traditional tunnel waterproofing and drainage system with this technical solution under the same seepage parameters. The size of the tunnel water inflow Q. The model size and permeability coefficient in the numerical simulation calculation are taken from Table 2 in Example 2, that is, the size and permeability coefficient of Qianying Tunnel. The specific implementation steps are as follows:

[0103] Step 1: Use finite element analysis software ANSYS to establish a circular tunnel calculation model with a tunnel length of 1m. The element type is SOLID70, and the number of elements is 97920. The specific numerical simulation calculation grid is as follows: Figure 4 , Figure 5 shown.

[0104] Step 2: Use the pressure valve to reduc...

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Abstract

The invention discloses a limited drainage method and a method for optimizing the thickness of a grouting circle of a tunnel by utilizing the limited drainage method, and belongs to the technical field of water proofing and drainage of underground construction. According to the limited drainage method, a water pressure adjusting valve is installed at a water outlet of a transverse drainage blind pipe of the tunnel to control external water pressure acting on a secondary lining of the tunnel, then full play is given to the certain carrying capacity of the lining, the thickness of the grouting circle and the drainage of underground water are reduced as much as possible, and then the environment of the underground water is protected. By means of the method for utilizing the limited drainage method for optimizing the thickness of the grouting circle of the tunnel, through an entire theoretical analysis, water pressure, flow rate and displacement of all modules of a support system are calculated, then design parameters are optimized, the thickness of the grouting circle is greatly reduced, the grouting cost is lowered, and the construction speed is increased.

Description

technical field [0001] The invention relates to the technical field of underground engineering waterproofing and drainage, in particular to a limited drainage method and a method for optimizing the thickness of a tunnel grouting ring. Background technique [0002] The drainage system plays a leading role in the tunnel support system, and a good drainage system can reduce the pressure of the external groundwater on the tunnel lining. However, for arid or semi-arid areas that rely on groundwater ecosystems, the excessive discharge of groundwater due to tunnel excavation will have a certain negative impact on the hydrogeological environment of the area, and even lead to the destruction of the groundwater environment and the surface Vegetation lacks death. [0003] In the current tunnel drainage system design, when the hydraulic head from the groundwater level to the top of the tunnel is less than 50m, the full sealing technology is often used to make the tunnel a completely cl...

Claims

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Application Information

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IPC IPC(8): E21F16/02G06F30/13G06F30/20G06F119/14G06F111/10
CPCE21F16/02G06F30/13G06F30/20G06F2119/14G06F2111/10
Inventor 何本国李红普冯夏庭李辉张羽刘恩榕
Owner NORTHEASTERN UNIV
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