DEM analyses of shear behaviour of rock joints by a novel bond contact model

International Symposium on Geohazards and Geomechanics 2015

地球科学;生态环境科学

Jiang, M.J.^1,2,3 ; Liu, J.^1,2,3 ; Sun, C.^1,2,3 ; Chen, H.^4

State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai

200092, China^1

Key Laboratory of Geotechnical and Underground Enigineering of Ministry of Education, Tongji University, Shanghai

200092, China^2

Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai

200092, China^3

Yunnan Traffic Planning Design and Research Institute, Kunming, China^4

关键词: Bond contact models;    Distinct element methods;    Inclination angles;    Joint connectivity;    Non-coplanar;    Peak shear strength;    Shear behaviour;    Shear capacity;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/26/1/012021/pdf
DOI  :  10.1088/1755-1315/26/1/012021

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The failure of rock joints is one of the potential causes for the local and general rock instability, which may trigger devastating geohazards such as landslide. In this paper, the Distinct Element Method (DEM) featured by a novel bond contact model was utilized to simulate shear behaviour of centre/non-coplanar rock joints. The DEM results show that the complete shear behaviour of jointed rock includes four stages: elastic shearing phase, crack propagation, the failure of rock bridges and the through-going discontinuity. The peak shear strength of centre joint increases as the joint connectivity rate decreases. For intermittent noncoplanar rock joints, as the inclination of the rock joints increases, its shear capacity decreases when the inclination angle is negative while increase when positive. Comparison with the experimental results proves the capability of this DEM model in capturing the mechanical properties of the jointed rocks.