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Tunnel primary support reserved deformation determination method considering surrounding rock post-peak behaviors

A technology for initial support and method determination, applied in special data processing applications, geometric CAD, design optimization/simulation, etc.

Active Publication Date: 2021-04-09
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Strain softening effect and dilation effect are typical mechanical characteristics of rocks after the peak, however, the existing methods for estimating the amount of reserved deformation involve less

Method used

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  • Tunnel primary support reserved deformation determination method considering surrounding rock post-peak behaviors
  • Tunnel primary support reserved deformation determination method considering surrounding rock post-peak behaviors
  • Tunnel primary support reserved deformation determination method considering surrounding rock post-peak behaviors

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Embodiment Construction

[0162] Below in conjunction with accompanying drawing, the technical solution of the invention is described in further detail.

[0163] The present invention is a method for determining the reserved deformation of the initial support of the tunnel considering the behavior behind the peak of the surrounding rock. The implementation flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0164] 1) Obtain the basic mechanical parameters of the surrounding rock, such as initial ground stress, tunnel radius, strain softening coefficient, dilation coefficient, strength parameters, deformation parameters, etc., through construction site exploration, testing and analysis, and obtain the thickness and elastic modulus of the primary support , Poisson's ratio, uniaxial compressive strength, etc. (relevant parameters of composite primary support can be converted). The basic mechanical parameters and supporting mechanical parameters of the surrounding rock are lis...

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Abstract

The invention provides a tunnel primary support reserved deformation determination method considering surrounding rock post-peak behaviors. The method comprises the steps that (1) surrounding rock basic mechanical parameters and support mechanical parameters are obtained; 2) a tunnel excavation theoretical model is established; 3) an upper limit threshold of the reserved deformation is calculated; 4) a lower limit threshold of the reserved deformation is calculated; and (5) the specific range of the reserved deformation is determined according to the upper limit threshold value and the lower limit threshold value of the reserved deformation, and a proper reserved deformation value is selected from the range during construction and directly used for an engineering construction site. According to the method, the reserved deformation range of the surrounding rock can be calculated by fully combining post-peak mechanical behaviors including strain softening and shear expansion characteristics of the surrounding rock, the subjectivity in the aspect of supporting opportunity design is reduced, and the scientificity of the method is improved; and meanwhile, the specific range of the reserved deformation can be quickly calculated, and the method has the advantages of intuition, simplicity and convenience.

Description

technical field [0001] The invention belongs to the technical field of tunnel support structure design and relates to a method for determining the reserved deformation of the initial support of a tunnel in consideration of the behavior behind the peak of the surrounding rock. Background technique [0002] As early as the 19th century, people began to explore the theory of tunnel support design. In the early engineering circles, the lining was used as the main force-bearing member to bear the load of the upper surrounding rock, and the thickness of the lining was designed to be relatively large. After the 1960s, the new Austrian method has attracted attention as a new tunnel design method. The basic guiding ideology of the new Austrian method is to give full play to the bearing capacity of the surrounding rock itself, and use flexible structures such as shotcrete and anchor rods as the main form of primary support. By timely strengthening the surrounding rock and controlling ...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F30/20
CPCG06F30/13G06F30/20
Inventor 崔岚谢明星盛谦易顺卢渊
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI
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