A Numerical Method for Simulating Severe Bias and Large Deformation in Tunnels
A numerical method and large deformation technology, applied in earthwork drilling, special data processing applications, design optimization/simulation, etc., can solve the mechanism analysis and construction countermeasures that are difficult to converge, difficult to simulate large deformation of tunnel, and affect large deformation of surrounding rock and other problems to achieve the effect of improving the convergence
Active Publication Date: 2022-07-29
INST OF ROCK & 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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Embodiment 1
[0035] In a typical embodiment of the present disclosure, such as Figure 1-Figure 5 shown, a numerical method for simulating large deformations of tunnels with severe bias is proposed.
[0036] It mainly includes the following steps:
[0037] Establish a plane calculation model of the load structure on the upper step, and divide the element grid along the thickness direction of the load structure;
[0038] Establish a concrete plastic damage constitutive model for the concrete layer, and input parameters to simulate the stress and deformation of the concrete layer;
[0039] Tensile and compressive stress is applied to the load structure along the normal direction through nonlinear spring elements, one end of the arc-shaped trajectory of the load structure is fixed, the other end is simulated by a compression spring, and the other positions are made of nonlinear spring elements with tensile and compressive stress and deformation characteristics;
[0040] The load structure i...
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The present disclosure provides a numerical method for simulating severe bias and large deformation of a tunnel, which relates to the field of tunnel construction simulation, establishes a plane calculation model of a load structure and a plastic damage constitutive model of a concrete layer, and uses nonlinear spring simulation to define different tension and compression The stress-deformation characteristics and the nonlinear contact properties of different contact areas can more realistically reflect the interaction between the supporting structure and the surrounding rock, and analyze the deformation and stress response of the tunnel load structure under the eccentric stress of the surrounding rock. The bias deformation failure mechanism of the supporting structure provides an analysis method.
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 a tunnel. Background technique [0002] The statements in this section merely provide background related to the present disclosure and do not necessarily constitute prior art. [0003] The complexity of geotechnical engineering determines the necessity and importance of using 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 mechanics t...
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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 & SOIL MECHANICS CHINESE ACAD OF SCI