Numerical solution method for deformation of rock stratum and lining in shielded subway tunnel
A numerical solution, force deformation technology, applied in the direction of electrical digital data processing, special data processing applications, geometric CAD, etc., can solve problems such as uneven deformation of rock and soil layers, difficult stress release method simulation, etc., to achieve calculation time and storage The effect of space reduction
Active Publication Date: 2021-11-12
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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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
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[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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The present invention relates to a numerical solution method for the stress deformation of the rock stratum-lining of a shield subway tunnel, including: 1) clarifying the geometric parameters and material parameters of the tunnel structure according to the geological survey data; Grid, specify the boundary conditions and stress field conditions of the model, and calculate the model to balance; 3) Apply gravity load according to the material properties, clear the model displacement and calculate to balance; 4) Excavate the tunnel in the model, based on the clearance parameters In the non-uniform deformation convergence mode, the displacement boundary is controlled by adjusting the stress of each node of the rock boundary, and the model is calculated to balance; 5) Apply lining at the tunnel boundary, release the tunnel boundary stress to reduce it to 0, and calculate the model to balance; 6) According to the balanced model, extract the distribution law of stress and deformation of rock formation-lining. The invention simplifies the three-dimensional numerical method of the shallow-buried shield subway, and can provide beneficial reference for the design of the 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...
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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 & SOIL MECHANICS CHINESE ACAD OF SCI