Failure behavior around a circular opening in a rock mass with non-persistent joints:A parallel-bond stress corrosion approach

作     者：YANG Xu-xu JING Hong-wen CHEN Kun-fu YANG Sheng-qi 杨旭旭;靖洪文;陈坤福;杨圣奇

作者机构：State Key Laboratory for Geomechanics & Deep Underground EngineeringChina University of Mining and Technology Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and MitigationShandong University of Science and Technology Rock Mass Modeling and Computational Rock Mechanics LaboratoriesUniversity of Arizona 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2017年第24卷第10期

页      面：2406-2420页

核心收录：

学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Project(2013CB036003)supported by the National Basic Research Program of China Projects(51374198,51134001,51404255)supported by the National Natural Science Foundation of China Project(BK20150005)supported by the Natural Science Foundation of Jiangsu Province for Distinguished Youth Scholar,China 

主　　题：failure behavior circular opening non-persistent joint PFC software package stress corrosion 

摘      要：The stability of underground excavations is influenced by discontinuities interspaced in surrounding rock masses as well as the stress condition. In this work, a numerical study was undertaken on the failure behavior around a circular opening in a rock mass having non-persistent open joints using PFC software package. A parallel-bond stress corrosion(PSC) approach was incorporated to drive the failure of rock mass around the circular opening, such that the whole progressive failure process after excavation was reproduced. Based on the determined micro parameters for intact material and joint segments, the failure process around the circular opening agrees very well with that obtained through laboratory experiment. A subsequent parametric study was then carried out to look into the influence of lateral pressure coefficient, joint dip angle and joint persistency on the failure pattern and crack evolution of the rock mass around the circular opening. Three failure patterns identified are step path failure, planar failure and rotation failure depending on the lateral pressure coefficient. Moreover, the increment of joint dip angle and joint persistency aggravates the rock mass failure around the opening. This study offers guideline on stability estimation of underground excavations.