基于改进GSI体系确定三峡地下厂房围岩等效变形模量及强度

黄达; 黄润秋; 张永兴

Volume 34 Issue 6

Jun. 2009

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HUANG Da, HUANG Run-qiu, ZHANG Yong-xing, 2009. Equivalent Deformation Modulus and Strength Parameters of Surrounding Rock for the Underground Powerhouse of Three Gorges Project Based on the Modified GSI System. Earth Science, 34(6): 1030-1036.

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Equivalent Deformation Modulus and Strength Parameters of Surrounding Rock for the Underground Powerhouse of Three Gorges Project Based on the Modified GSI System

1.
College of Civil Engineering, Chongqing University, Chongqing 400045, China
2.
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China

Received Date: 2009-04-23
Publish Date: 2009-11-25

Abstract

Abstract

The influence of orientation of structure plane on parameters of rock mass is neglected in the study on the strength and deformation modulus based on geological strength index (GSI) system and Hoek-Brown strength rule. In this paper, as a case of underground powerhouse in the Three Gorges Project, the influence coefficient between the distribution of structure plane and structure rating (SR) of surrounding rock is calculated based on the space distribution character of excavated surface and structure plane; the statistical method of SR in the GSI system applied for large underground caverns is modified; and the experiential estimates of equivalent deformation modulus and strength parameters of surrounding rock are acquired. The investigations show that the calculative errors of the equivalent elastic modulus in elastic zone, deformation modulus and cohesive strength in disturbed zone of surrounding rock based on modified GSI system decreased by about 15%, 8%, 28% respectively.
- geological strength index (GSI),
- deformation modulus,
- strength parameters,
- orientation of structure plane,
- underground powerhouse,
- engineering geology

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References

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Equivalent Deformation Modulus and Strength Parameters of Surrounding Rock for the Underground Powerhouse of Three Gorges Project Based on the Modified GSI System

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