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Meshless method for analyzing excavation and support of tunnel

A technology of meshless method and analysis method, which is applied in the field of tunnels, can solve the problems of low stress accuracy, high calculation cost, and difficulty in adaptive analysis, and achieve the effect of reducing difficulties and strong adaptability

Inactive Publication Date: 2017-11-24
SICHUAN UNIV
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Problems solved by technology

[0004] (1) The computational cost when forming FEM grid is high;
[0005] (II) Stress accuracy is low
[0006] (III) Adaptive Analysis Difficulty

Method used

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  • Meshless method for analyzing excavation and support of tunnel
  • Meshless method for analyzing excavation and support of tunnel
  • Meshless method for analyzing excavation and support of tunnel

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Embodiment Construction

[0035] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

[0036] Such as figure 1 and combine figure 2 As shown, the analysis method of tunnel excavation and support without mesh method, the method steps include: (1) start the CAE of ABQUS, and establish the two-dimensional model of the cavern; (2) divide the triangular element model; (3) output the model file Job-1.inp

[0037] (4) Start MATLAB, open the MFVM main program Main_Program.M file; (5) Read the model file Job-1.inp; (6) Generate node information; (7) Use MFVM to calculate the initial stress of surrounding rock; (8) Calculate the stress field and displacement field of the first excavation step.

[0038] The method steps further include: (9) bolt support calculation, rheological analysis; (10) calculating the second excavation step stress fi...

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Abstract

The invention relates to the technical field of tunnels, in particular to a meshless method for analyzing excavation and support of a tunnel. The method comprises the following steps of (1) starting CAE of ABQUS, and establishing a two-dimensional model of a chamber; (2) dividing a triangular cell model; (3) outputting a model file, Job-1. Inp; (4) starting MATLAB, opening a main program file, Main_Program. M, of MFVM; (5) reading the model file, Job-1. inp; (6) generating node information; (7) using the MFVM to calculate the initial ground stress of surrounding rocks; (8) calculating a stress field and a displacement field in the first step of the excavation. The method has the advantages that since an approximation function of the meshless method has no dependence on meshes, the difficulty caused by grid distortion is reduced, interface connection with CAD software can be achieved more easily, and the method is suitable for solving large-scale scientific and engineering problems; besides, since the adaptability of the meshless method is very strong, node position information rather than mesh information is needed in the pretreatment of the meshless method, and a complex three-dimensional structure can be analyzed easily; moreover, an obtained graph of meshless calculation is smooth and continuous, so no stress smoothing is needed.

Description

technical field [0001] The invention relates to the technical field of tunnels, in particular to a gridless analysis method for tunnel excavation and support. Background technique [0002] Finite element (FEM) is a robust and mature method, which has been widely used in engineering because of its versatility and flexibility in dealing with various linear and nonlinear problems of complex geometries. . At present, most practical engineering problems involving solids and structures can be solved using commercial FEM software packages. [0003] However, FEM has inherent weaknesses in its numerical approach: [0004] (1) The computational cost when forming FEM grid is high; [0005] (II) Stress accuracy is low [0006] (III) Adaptive analysis is difficult. [0007] Therefore, it is necessary to propose a meshless analysis method for tunnel excavation and support for the above problems. Contents of the invention [0008] Aiming at the deficiencies in the above-mentioned p...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 黄哲聪薛新华周家文
Owner SICHUAN UNIV
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