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Analysis method for stability of primary support of anhydrite tunnel based on surrounding rock-support evolution model

An analysis method and initial support technology, applied in the direction of design optimization/simulation, special data processing applications, instruments, etc., can solve problems affecting engineering stability, etc.

Pending Publication Date: 2019-09-20
CHINA COAL TECH ENG GRP CHONGQING RES INST
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Problems solved by technology

[0002] The expansion of anhydrite surrounding rock will generate pressure on the structures in it, seriously affecting the stability of the project

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  • Analysis method for stability of primary support of anhydrite tunnel based on surrounding rock-support evolution model
  • Analysis method for stability of primary support of anhydrite tunnel based on surrounding rock-support evolution model
  • Analysis method for stability of primary support of anhydrite tunnel based on surrounding rock-support evolution model

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Embodiment Construction

[0075] An anhydrite tunnel primary support stability analysis method based on the surrounding rock-support evolution model, based on the classic circular axisymmetric tunnel elastic deformation problem, considering the water absorption-expansion evolution characteristics of the anhydrite surrounding rock, research Displacement and stress distribution characteristics of the tunnel. A circular tunnel with a radius of R0 is excavated in the continuous, homogeneous and isotropic anhydrite surrounding rock, the stress of the surrounding rock is P0, and the free surface of the tunnel is under uniform support. pressure Ps; the initial humidity distribution function W of each point of the surrounding rock, respectively: the initial humidity [14] gradually increases with r (working condition 1), is uniformly distributed along r (working condition 2), and gradually decreases with r (working condition Case 3), where w 0i is the initial humidity at r=R0; r and σ θ changes over time, suc...

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Abstract

The invention discloses an analysis method for stability of primary support of anhydrite tunnel based on a surrounding rock-support evolution model. Based on the stress field theory, the time-varying property of expansion is comprehensively considered, and the elasticity-expansion evolution solution of the surrounding rock is established. A characteristic equation of a support structure is combined to form the surrounding rock-support evolution model capable of considering expansion evolution; and the stability of the tunnel is analyzed according to the evolution model. According to the method, the dynamic influence of the expansion effect on the preliminary bracing stability of the anhydrite tunnel can be analyzed, and the method has important engineering significance for regulating and controlling the anti-expansion design of the tunnel.

Description

technical field [0001] The invention relates to a method for analyzing the initial support stability of an anhydrite tunnel based on a surrounding rock-support evolution model. Background technique [0002] The expansibility of anhydrite surrounding rock will generate pressure on the structures therein, seriously affecting the stability of the project. Since many tunnel projects in Southwest China cannot avoid the anhydrite rock of the Jialingjiang Formation of the Lower Triassic system, as my country's railways and highways further extend to the western region, the damage of the expansibility of anhydrite rock to tunnel engineering will continue to be highlighted. It is of great engineering significance to regulate the anti-swelling design of such tunnels by determining the effect of expansion on the stability of the initial support of anhydrite tunnels. Contents of the invention [0003] The purpose of the present invention is to provide a method for analyzing the initi...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 孙中光郭江涛吴建勋刘亚辉李远清张金豪张加易邵严胡宇胡英杰周代勇张海鹏郑芳菲
Owner CHINA COAL TECH ENG GRP CHONGQING RES INST