Strength Degradation Mechanism of Soft and Hard Interbedded Rock Masses of Badong Formation Caused by Rock/Discontinuity Degradation

被引：7
|
作者：
Kang J. [1 ]
Wu Q. [1 ]
Tang H. [1 ]
Hu X. [1 ]
Fan L. [1 ]
Zhang S. [2 ]
Yi X. [1 ]
机构：
[1] Faculty of Engineering, China University of Geosciences, Wuhan
[2] Three Gorges Research Center for Geo-Hazards, Ministry of Education, China University of Geosciences, Wuhan
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2019年 / 44卷 / 11期
关键词：
Badong Formation; Dip angle; Engineering geology; Soft and hard interbedded rock mass; Strength deterioration; Uniaxial compressive strength;
D O I：
10.3799/dqkx.2019.110
中图分类号：
学科分类号：
摘要：
Strength degradation mechanism of soft and hard interbedded rock mass of Badong Formation caused by rock/discontinuity degradation is the key issue to reveal progressive strength deterioration mechanism of soft and hard interbedded rock mass of Badong Formation in hydro-fluctuation belt of reservoir bank and to evaluate the stability of reservoir bank slope in the Three Gorges area. Sandstone and silty mudstone of the typical sliding-prone soft and hard interbedded rock masses of Badong Formation in the Three Gorges area were taken as the research object to conduct uniaxial compression numerical test, considering the deterioration of rock/discontinuity parameters under the condition of drying-wetting cycle, the contribution of soft rock/hard rock/bedding plane degradation to the uniaxial compression strength degradation of soft and hard interbedded rock masses in the Badong Formation and its relationship with the dip angle are analyzed. The results indicate that the influence of soft rock/hard rock/bedding plane deterioration on the uniaxial compression strength degradation of soft and hard interbedded rock mass in the Badong Formation has obvious difference under different dip angles. The dip angle is divided into soft rock control zone, soft rock-hard rock-bedding plane common control zone, slip failure zone along the bedding plane and hard rock control zone based on their contribution. The results reveal the mechanism of strength degradation of soft and hard interbedded rock mass caused by rock/discontinuity deterioration and the influence of dip angle, which provides the basis for revealing the progressive strength deterioration mechanism of soft and hard interbedded rock masses of the Badong Formation in hydro-fluctuation belt of reservoir bank. © 2019, Editorial Department of Earth Science. All right reserved.
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页码：3950 / 3960
页数：10
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