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Surrounding rock stress analysis method of arbitrarily excavated cross section tunnels

A technology of surrounding rock stress and analysis methods, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as low efficiency, large test difficulty, large differences, etc., and achieve high engineering reliability, high precision, Versatile effect

Active Publication Date: 2013-03-20
杭州鑫高科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the results of similar engineering analysis are often quite different, and there is a certain gap between the calculation results and the actual situation. The degree of simplification of the problem is related, so the concept of "quantitative analysis, qualitative application" is currently adopted for numerical simulation; secondly, the efficiency is low, especially when the boundary conditions change (load and material properties, etc.) , it is necessary to remodel and calculate the stress field or displacement field for each boundary condition
However, due to the lack of research on mathematical calculation methods, the research results of the analytical solutions of the surrounding rock stress field and displacement field of single tunnel tunnels are more concentrated on circular tunnels, and the analysis results of the surrounding rock stress of arbitrary excavation sections have not yet been obtained. Mature
[0003] The disadvantages of the existing technology are: (1) When using the numerical calculation method to analyze the surrounding rock stress of tunnels with arbitrary excavation sections, the results of similar engineering analysis are often quite different, and there are also discrepancies between the calculation results and the actual situation. There is a certain gap, and the efficiency of actual engineering analysis is also low; the current use of this method is based on a concept of "quantitative analysis, qualitative application"
(2) The model test has the disadvantages of size effect, difficult test and high cost
(3) Only the displacement and stress information of specific projects can be obtained through on-site monitoring and measurement. Since the boundary conditions of actual projects vary widely, this method cannot do regular research on similar problems
(4) Due to the lack of research on mathematical calculation methods, the research results of the analytical solution of surrounding rock stress for tunnels with arbitrary excavation sections are mainly concentrated on circular and elliptical tunnels, and the research results for other arbitrary excavation sections are immature, and No explicit analytical solution is given, and the versatility is poor. It is impossible to carry out elastoplastic analytical analysis on the tunnel surrounding rock stress of any excavation section by using the existing results

Method used

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  • Surrounding rock stress analysis method of arbitrarily excavated cross section tunnels
  • Surrounding rock stress analysis method of arbitrarily excavated cross section tunnels
  • Surrounding rock stress analysis method of arbitrarily excavated cross section tunnels

Examples

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Embodiment 1

[0048] refer to figure 1 , 2 , 3, 4 and 5, using a method for analyzing the surrounding rock stress of an underground tunnel excavated at random, the surrounding rock stress of a circular tunnel is analyzed, and the method mainly includes the following steps:

[0049] (1) Calculation conditions and parameters.

[0050] There is a circular tunnel with R=3m, see the mechanical model Figure 5 , the calculation model see figure 2 . Depend on Figure 5 Know: H=630m>20R 0 . The bulk density of surrounding rock is γ=23KN / m 3 , the lateral pressure coefficient λ is 0.54. The relevant parameters are calculated as follows:

[0051] σ y ∞ = γH = 14.49 Mpa , σ x ∞ = λσ y ∞ = 7.82 MPa

[0052] B = ...

Embodiment 2

[0071] refer to figure 1 , 2 , 3, 4 and 8, using a method for analyzing the surrounding rock stress of an arbitrary excavation section of an underground tunnel, the tunnel surrounding rock stress analysis after excavation of a tunnel based on the standard outline of a two-lane highway tunnel is carried out. Include the following steps:

[0072] (1) Calculation conditions and parameters.

[0073] The calculation object is a two-lane highway tunnel with a buried depth of 120m, the surrounding rock level is III, and the gravity γ is 23kN / m 3 , the lateral pressure coefficient λ is 0.54. The standard internal contour section of a two-lane highway tunnel in the "Code for Design of Highway Tunnels" (JTG D702004) is Figure 8 (a); The actual excavation section of the tunnel is generally about 50-500mm away from the standard inner contour line, depending on the surrounding rock grade, buried depth and support design and other conditions. In this calculation, the excavation width ...

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Abstract

The invention relates to a surrounding rock stress distribution determining method in the tunnel surrounding rock stability analysis and evaluation field. The method comprises the following steps that (1) a mechanical model is built: the surrounding rock volume weight is set as gamma, the side pressure coefficient is set as lambda, the tunnel buried depth is set as H, the excavation span is set as D, and when the tunnel buried depth H and the excavation span D meet the condition that H is greater than or equal to 10D, the original ground stress field of the tunnel is simplified into the vertical stress, the horizontal stress and the shearing force uniformly distributed at infinity; (2) a mapping function of the arbitrarily excavated cross section and the variable zeta is built; (3) zeta and omega are adopted for showing analytic function psi(z); (4) the excavated surrounding rock stress of the tunnel is obtained through calculation according to the following complex variable functions; and (5) the calculated surrounding rock stress is analyzed. The method fills the underground tunnel surrounding rock stress analysis and analysis blank, and higher precision and higher engineering reliability are realized.

Description

technical field [0001] The invention relates to a method for determining the stress distribution of the surrounding rock in the field of stability analysis and evaluation of the surrounding rock of a tunnel, which is used to quickly, conveniently and efficiently determine the stress of the surrounding rock in the process of analyzing and evaluating the stability of the surrounding rock after tunnel excavation Distribute and conduct surrounding rock stress analysis. Background technique [0002] Generally, there are four methods for stress analysis of surrounding rock in underground tunnels. One is the numerical calculation method, which needs to analyze the elastic-plastic mechanics of the surrounding rock of the underground tunnel, determine the displacement field or stress field of the surrounding rock under specific boundary conditions, and then carry out the stress analysis and stability evaluation of the surrounding rock according to the obtained results. To determine ...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 祝江鸿李明友王渊朱鹏
Owner 杭州鑫高科技有限公司
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