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Simulation calculation method for mechanical behavior of side shield tunnel under unloading condition

A technology of shield tunneling and simulation calculation, which is applied to tunnels, tunnel linings, underground chambers, etc., can solve the problem that the damage is at the joints, and the deformation and stress of the joints of the shield tunnel cannot be obtained, so as to achieve precise simulation Effect

Inactive Publication Date: 2020-02-21
SHANGHAI CONSTRUCTION GROUP
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Problems solved by technology

Restricted by the performance of the computer and the calculation time and efficiency, when using this method for analysis, the equivalent homogeneous cylinder is often used to simulate the subway tunnel, so that only the overall deformation of the shield tunnel can be obtained, but not the shield tunnel. The deformation and stress at the joints of the tunnel, however, shield tunnels often fail at the joints, so the existing methods cannot fully and finely simulate the side shield tunnel under the excavation and unloading conditions of the foundation pit. Structural traits

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  • Simulation calculation method for mechanical behavior of side shield tunnel under unloading condition

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Embodiment 1

[0018] refer to figure 1 , the technical scheme of a method for simulating and calculating the mechanical behavior of side shield tunnels under unloading conditions in this embodiment is as follows, including the following steps:

[0019] In the first step, according to the engineering background and related data, numerical software is used to carry out three-dimensional stratum-structural modeling analysis and calculation of the foundation pit, tunnel and soil;

[0020] The second step is to extract the earth pressure on the tunnel after excavation of the foundation pit according to the results of 3D stratum-structure modeling analysis and calculation;

[0021] The third step is to use numerical software to carry out refined simulation of the tunnel to form a refined tunnel model;

[0022] In the fourth step, the earth pressure of the tunnel extracted in the second step after excavation of the foundation pit is applied to the refined tunnel model, and the physical and mechan...

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Abstract

In order to realize the fine simulation calculation for the mechanical behavior of the side shield tunnel under the unloading condition, the invention provides a simulation calculation method for themechanical behavior of the side shield tunnel under the unloading condition. According to the simulation calculation method for the mechanical behavior of the side shield tunnel under the unloading condition, fine simulation calculation of the structural shape of the lateral tunnel under the unloading action of foundation pit excavation can be realized under limited calculation resources, the shield tunnel detail analysis is realized, and a reference is provided for actual engineering safety evaluation.

Description

technical field [0001] The invention belongs to the technical field of underground engineering, in particular to a method for simulating and calculating the mechanical behavior of side shield tunnels under unloading conditions. Background technique [0002] At present, for the calculation and analysis of the structural mechanical properties of side shield tunnels under unloading conditions, the three-dimensional stratum-structure method is mainly used. Structural behavior of side subway tunnels under pit excavation and unloading conditions. Restricted by the performance of the computer and the calculation time and efficiency, when using this method for analysis, the equivalent homogeneous cylinder is often used to simulate the subway tunnel, so that only the overall deformation of the shield tunnel can be obtained, but not the shield tunnel. The deformation and stress at the joints of the tunnel, however, shield tunnels often fail at the joints, so the existing methods cann...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/08E21F17/00E21F17/18G06F30/20
CPCE21D11/08E21F17/00E21F17/18
Inventor 孙廉威王新新吴小建沈雯程子聪
Owner SHANGHAI CONSTRUCTION GROUP
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