Determination method of reserved deformation for primary support of tunnel considering surrounding rock behavior after peak

A technology for initial support and determination of methods, applied in geometric CAD, design optimization/simulation, special data processing applications, etc., to achieve the effect of simple methods, fast and convenient acquisition, and specific and clear results

Active Publication Date: 2021-10-15
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • 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

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  • Determination method of reserved deformation for primary support of tunnel considering surrounding rock behavior after peak
  • Determination method of reserved deformation for primary support of tunnel considering surrounding rock behavior after peak
  • Determination method of reserved deformation for primary support of tunnel considering surrounding rock behavior after peak

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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 method for determining the reserved deformation of the initial support of the tunnel considering the behavior behind the peak of the surrounding rock, including: 1) obtaining the basic mechanical parameters of the surrounding rock and the mechanical parameters of the support; 2) establishing a theoretical model of tunnel excavation; 3 ) Calculate the upper threshold of the reserved deformation; 4) Calculate the lower threshold of the reserved deformation; 5) Determine the specific range of the reserved deformation according to the upper threshold of the reserved deformation and the lower threshold of the reserved deformation. Select the appropriate reserved deformation value from this range, and directly use it on the construction site. The invention can fully combine the post-peak mechanical behavior of the surrounding rock, including strain softening and dilatancy characteristics, to calculate the reserved deformation range of the surrounding rock, reduce the subjectivity in the design of support timing, and improve its scientificity; at the same time, it can quickly calculate The specific range of deformation is reserved, which has the advantages of intuition and simplicity.

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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Patent Type & Authority Patents(China)
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 & SOIL MECHANICS CHINESE ACAD OF SCI
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