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Stress distribution acquisition method after excavation of shield tunnel

A technology of shield tunneling and stress distribution, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as lack of data or comparison of finite element calculation results

Inactive Publication Date: 2014-09-03
JINAN UNIVERSITY
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  • Application Information

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Problems solved by technology

However, none of these methods compare the theoretical method with the actual engineering data or finite element calculation results.

Method used

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  • Stress distribution acquisition method after excavation of shield tunnel
  • Stress distribution acquisition method after excavation of shield tunnel
  • Stress distribution acquisition method after excavation of shield tunnel

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Embodiment 1

[0042] like figure 1 As shown, this embodiment discloses a method for obtaining stress distribution after excavation of a shield tunnel, and the steps are:

[0043]S1: According to the relevant parameters of the tunnel to be excavated, use ANSYS finite element software to establish a two-dimensional finite element model of the shield tunnel and the surrounding soil. The model is as follows figure 2 , where the plane183 element is selected in this embodiment to build the two-dimensional finite element model. The plane183 element is called a two-dimensional 8-node structural solid element, which is higher than the plane182 element and can be more suitable for models with irregular boundaries. This kind of unit can be regarded as both a planar unit and an axisymmetric unit at the same time. This kind of unit is defined by 8 nodes, and each node has two degrees of freedom, that is, translational displacement along the X direction and Y direction of the coordinate system of the n...

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Abstract

The invention discloses a stress distribution acquisition method after excavation of a shield tunnel. The method comprises the following steps: S1, establishing a finite element model according to related parameters of the tunnel to be excavated; S2, acquiring stress values and stress distribution condition of position nodes around the tunnel and the tunnel surrounding rock in the finite element model; S3, acquiring stress theoretical values at different position nodes around the tunnel and the tunnel surrounding rock after excavation according to the planar stress of the finite element model; and S4, comparing the stress theoretical values at different position nodes around the tunnel and the tunnel surrounding rock after excavation with the stress values at the corresponding position nodes around the tunnel and the tunnel surrounding rock in the finite element model, and determining the correctness of the stress theoretical values around the tunnel and the tunnel surrounding rock after excavation according to compare result. The method disclosed by the invention verifies and analyzes correctness and feasibility of the stress values acquired by the theoretical method through the comparative result so as to obtain the stress distribution condition of the shield tunnel after excavation.

Description

technical field [0001] The invention relates to a shield tunnel excavation technology, in particular to a stress distribution acquisition method after shield tunnel excavation. Background technique [0002] With the development of social and economic construction and the acceleration of urbanization, the limited land resources have seriously affected various functions of the city. The development and utilization of underground space has attracted much attention, and more and more underground transportation facilities such as tunnels have been constructed. In the past 20 years, the tunnel engineering construction in our country has developed rapidly, and the achievements have been remarkable. As of May 2013, my country's subway has officially put into operation in 20 cities (including Hong Kong and Taiwan), the national operating mileage has reached 2518.6 kilometers, the mileage under construction is 2975.58 kilometers, and the planned mileage is 14678.84 kilometers. km (the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 袁鸿詹辉艇杨雄飞韩军
Owner JINAN UNIVERSITY
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