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Numerical solution method for rock stratum-lining stress deformation of shield subway tunnel

A numerical solution and force-deformation technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as simulation of difficult stress release methods, uneven deformation of rock and soil layers, etc.

Active Publication Date: 2021-04-06
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

For this reason, some studies have simulated the pre-deformation of the rock formation by controlling the stress release rate, but this technology is mainly applicable to the excavation of deep-buried tunnels using the new Austrian method. Difficult to simulate with stress relief methods

Method used

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  • Numerical solution method for rock stratum-lining stress deformation of shield subway tunnel
  • Numerical solution method for rock stratum-lining stress deformation of shield subway tunnel
  • Numerical solution method for rock stratum-lining stress deformation of shield subway tunnel

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Embodiment Construction

[0035] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The protection scope of the present invention is not limited only to the description of this embodiment.

[0036] A numerical solution method for the deformation of the rock formation and lining of the shield subway tunnel, the implementation flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0037](1) According to geological survey data, extract tunnel geometric parameters such as tunnel diameter and tunnel depth, and extract rock formation mechanical parameters such as elastic modulus, gravity, Poisson's ratio, and lateral pressure coefficient. All parameters are listed in Table 1.

[0038] Table 1 selects the value of working condition parameters

[0039]

[0040] (2) The tunnel excavation model is established by using the two-dimensional finite element software ROCSCIENCE PHASE2, and the values ​​of variou...

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Abstract

The invention relates to a numerical solution method for rock stratum-lining stress deformation of a shield subway tunnel, which comprises the following steps of: 1) defining geometrical parameters and material parameters of a tunnel structure according to geological survey data; 2) establishing a two-dimensional numerical calculation model, dividing model grids, defining model boundary conditions and stress field conditions, and calculating the model to balance; 3) applying gravity load according to material attributes, resetting the displacement of the model and calculating the model to be balanced; 4) excavating a tunnel in the model, defining a non-uniform deformation convergence mode based on gap parameters, controlling a displacement boundary by debugging the stress of each node of a rock stratum boundary, and calculating the model to be balanced; (5) applying a lining to the tunnel boundary, releasing tunnel boundary stress to reduce the tunnel boundary stress to 0, and calculating the model to be balanced, and (6) extracting a rock stratum-lining stress and deformation distribution rule according to the balanced model.By simplifying the three-dimensional numerical method of the shallow-buried shield subway, a beneficial reference can be provided for the design of a shield subway structure.

Description

technical field [0001] The invention belongs to the technical field of computer-aided design of shield-machined subway tunnel engineering, and relates to a numerical solution method for deformation of rock formations and linings of shield-machined subway tunnels. Background technique [0002] The rock formation-lining synergy of shield subway tunnels has always been a key issue in the safety control of urban rail transit. The instability of the surrounding rock and the damage of the lining caused by the interaction between the surrounding rock and the lining have brought great hidden dangers to construction safety. Aiming at this problem, the current research mostly adopts analytical method and numerical method to calculate the force deformation of surrounding rock-lining. Analytical methods rely on rigorous theoretical formulas and derivation processes. For shield tunnels, generally speaking, they are under shallow buried conditions, and the complex stress field environment...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F30/13
CPCG06F30/13G06F30/23G06F2119/14
Inventor 崔岚盛谦江巧王川
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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