Experimental study on shear properties of fault gouge with different mineral compositions

被引：0

作者：

Xie Li-huan ^{[1
,2
]}

Liu He-juan ^{[1
,2
]}

Ban Sheng-nan ^{[1
,2
]}

Mao Hai-jun ^{[1
,2
]}

Xli De-bin ^{[1
,2
]}

Song Yu-jia ^{[1
,2
]}

Tong Rong-chen ^{[1
,2
]}

Ying Qi-qi ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

ROCK AND SOIL MECHANICS | 2023年 / 44卷 / 09期

关键词：

fault gouge; shear properties; cohesion; internal friction angle; mineral composition; CLAY-MINERALS; STRENGTH; BEHAVIOR; STRESS; SOIL;

D O I：

10.16285/j.rsm.2022.1549

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

The strength parameters of fault gouge is significant for the fault sealing of underground gas storage. In this paper, direct shear tests are performed for fault gouge composed of different contents of kaolinite(K), montmorillonite(M) and quartz(Q), thus obtaining the shear strength parameters (cohesion c and internal friction angle phi) of various types of fault gouge. The results reveal that: (1) the cohesion of fault gouge is positively correlated with the content of montmorillonite and negatively correlated with the content of quartz. The cohesion of fault gouge specimens with high content of montmorillonite (>= 40%) is positively correlated with the content of kaolinite; (2) The internal friction angle of fault gouge is negatively correlated with the content of montmorillonite and positively correlated with the content of kaolinite; (3) The cohesion of fault gouge is positively correlated with the plasticity index Ip, while the internal friction angle is negatively correlated with the plasticity index h; (4) The predicted shear strength parameters of fault gouge obtained by statistical methods match well with the experimental results, indicating that statistical method is feasible in predicting the shear strength of fault gouge.

引用

页码：2545 / 2554

页数：10

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