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Numerical method for simulating serious bias large deformation of tunnel

A numerical method, large deformation technology, applied in earthwork drilling, special data processing applications, design optimization/simulation, etc., can solve the mechanism analysis of difficult convergence, unpredictable, affecting the large deformation of surrounding rock, construction countermeasure research, etc. problem, to achieve the effect of improving convergence

Active Publication Date: 2021-04-13
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The inventors found that for the numerical simulation of the large deformation of the surrounding rock of the tunnel, it is generally difficult to simulate the severe large deformation of the tunnel (the deformation reaches more than 1 meter), or even if the iterative calculation of the large deformation is set, it is often difficult to converge, resulting in the unexpected results. The effect has seriously affected the mechanism analysis and construction countermeasure research of severe large deformation of surrounding rock

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  • Numerical method for simulating serious bias large deformation of tunnel
  • Numerical method for simulating serious bias large deformation of tunnel
  • Numerical method for simulating serious bias large deformation of tunnel

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Embodiment 1

[0036] In a typical implementation of the present disclosure, such as Figure 1-Figure 5 As shown, a numerical method for simulating severe bias and large deformation of tunnels is proposed.

[0037] It mainly includes the following steps:

[0038] Establish the load structure plane calculation model of the upper steps, and divide the unit grid along the thickness direction of the load structure;

[0039] Establish a concrete plastic damage constitutive model for the concrete layer, and input parameters to simulate the stress and deformation of the concrete layer;

[0040] Apply tensile and compressive stresses to the load structure along the normal direction through the nonlinear spring unit, fix one end of the arc trajectory of the load structure, the other end is simulated by a compression spring, and the other positions are nonlinear spring units with tensile and compressive stress deformation characteristics;

[0041] The load structure simulates the loading, and obtain...

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Abstract

The invention provides a numerical method for simulating serious bias large deformation of a tunnel, and relates to the field of tunnel construction simulation. The numerical method comprises the steps that a load structure plane calculation model and a concrete layer plastic damage constitutive model are established; different tension and compression stress deformation characteristics and nonlinear contact attributes of different contact areas are defined through nonlinear spring simulation; and interaction between a supporting structure and surrounding rock can be truly reflected, deformation and stress response of the tunnel load structure after the surrounding rock is subjected to bias stress are analyzed, and an analysis means is provided for revealing the bias deformation damage mechanism of the supporting structure after tunnel construction.

Description

technical field [0001] The present disclosure relates to the field of tunnel construction simulation, in particular to a numerical method for simulating severe bias and large deformation of tunnels. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] The complexity of geotechnical engineering determines the necessity and importance of numerical simulation methods. With the rapid development of computer technology and the continuous improvement of various numerical calculation methods, numerical simulation technology has become an important means to effectively solve complex problems in geotechnical engineering, especially finite element numerical analysis, which has been recognized as the most effective method in engineering numerical analysis. calculation tool. When solving the large deformation problem of soft rock engineering, the mecha...

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Application Information

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IPC IPC(8): E21F17/18E21F17/00G06F30/20
CPCE21F17/18E21F17/00E21F17/185G06F30/20
Inventor 伍国军陈卫忠谭贤君张哲元
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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