Large bury depth cavern extrusion surrounding rock large deformation discrimination method

Abstract

The invention discloses a large bury depth cavern extrusion surrounding rock large deformation discrimination method which can quickly and reliably predict large deformation of the calculation point of the deep buried cavern engineering surrounding rock. The method comprises the steps that the in-situ ground stress test is performed and the lateral pressure coefficient lambda and the maximum principal stress value sigma0max are acquired; the rock core is drilled and processed into the cylindrical rock sample; the uniaxial compression test is performed on the rock sample so as to acquire the rock uniaxial compressive strength sigmac under the natural water content; the self-weight stress field is calculated according to the stress environment of the underground cavern or the rock strength-to-stress ratio SSR under the stress field is constructed; and occurrence of surrounding rock extrusion large deformation is judged according to the acquired self-weight stress field or the rock strength-to-stress ratio SSR under the constructed stress field. The method is used for judgment and prediction of large bury depth cavern surrounding rock extrusion large deformation and can be used for stability evaluation of the bury depth cavern and optimization of the permanent support design.

Description

technical field [0001] The present invention relates to the technical field of geological exploration, and specifically refers to a method for judging the large deformation of surrounding rock in large buried deep caverns, which is applicable to the stability evaluation and analysis of surrounding rocks in large buried deep caverns where the extrusion type failure mode is the main mode. Optimization of permanent support design. Background technique [0002] There is a very prominent contradiction between the high ground stress existing in the deep buried complex geological environment and the low strength of the weak surrounding rock. After the cavern is excavated and unloaded, the pressure around the cavern is quickly released. It is prone to large deformation and instability. Engineering practice and research show that the large deformation of surrounding rock in deep underground engineering mainly includes extrusion type, expansion type and collapse type. Most of the la...

AI Technical Summary

Problems solved by technology

However, there are relatively few existing achievements in this area, and an analysis theory and method that can reasonably reflect the large deformation of surrounding rock under high stress conditions has not been established.

Images