Tunnel mechanical behavior analysis method based on tunnel secondary lining surface strain

A behavioral analysis and tunneling technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems that cannot reflect mechanical properties

Pending Publication Date: 2021-05-11
四川藏区高速公路有限责任公司 +1
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Problems solved by technology

[0004] The purpose of the present invention is to solve the defect that the theoretical calculation results based on the external pressure of the structure cannot reflect the mechani

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  • Tunnel mechanical behavior analysis method based on tunnel secondary lining surface strain
  • Tunnel mechanical behavior analysis method based on tunnel secondary lining surface strain
  • Tunnel mechanical behavior analysis method based on tunnel secondary lining surface strain

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Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. The specific embodiments described here are only used to explain the present invention, not to limit the invention.

[0023] like figure 1 As shown, this embodiment provides a tunnel mechanical behavior analysis method based on the surface strain of the second lining of the tunnel, and the specific analysis steps are as follows:

[0024] 1) if figure 2 (a) layered homogeneous rings under uniform pressure; (b) schematic diagram of objects under polar coordinates. Firstly, the tunnel model is simplified and assumed, and a circular tunnel form with double-layered rings bearing loads is established and The force form of the differential element in the cylindrical coordinate system in the elastic mechanics system.

[0025] (1) Simplify the primary support and secondary lining ...

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Abstract

The invention discloses a tunnel mechanical behavior analysis method based on tunnel secondary lining surface strain. The method uses a homogeneous ring tunnel model in an elastic mechanics theory, utilizes the secondary lining surface strain at the positions of a tunnel vault, a tunnel shoulder, a tunnel haunch and a tunnel springing, a stress equation set of a simplified double-layer circular ring is deduced based on a geometric equation, a compatibility equation and a stress balance equation, and an MATLAB solving program is written to obtain a stress value inside the double-layer circular ring, and therefore the axial force and the bending moment of the tunnel secondary lining are derived. Finite element software ANSYS is utilized to establish an entity unit load-structure model of the tunnel, numerical calculation under elastic constitutive is carried out, and a structure correction coefficient is determined through comparison with actual engineering. The problems that a traditional sensor is high in loss rate in the long-term operation process of a tunnel, and tunnel full-life mechanical detection cannot be carried out are solved. The method is of great significance in reflecting the long-term mechanical properties of the tunnel by using the secondary lining surface strain and giving full play to the advantages of the fiber grating sensor.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering monitoring, in particular to a tunnel mechanical behavior analysis method based on the surface strain of the second lining of the tunnel. Background technique [0002] Although with the continuous development of computer performance and numerical simulation methods, various complex actual working conditions can be calculated and results with reference significance can be obtained. Judging from the existing theoretical research results at home and abroad, most of the theoretical derivations still focus on the distribution of plastic zones and stress changes inside the rock and soil around the tunnel, and the research on the internal stress distribution of the support structure that can directly reflect the safety performance of the tunnel less; the effect of the tunnel support structure on the rock mass is simplified as a uniform support force, which is difficult to reflect the actual si...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F30/23G06F119/14G06F111/10
CPCG06F30/13G06F30/23G06F2119/14G06F2111/10
Inventor 杨文波马杲宇李永林梁杨何川刘家民
Owner 四川藏区高速公路有限责任公司
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