Zonal disintegration phenomenon in enclosing rock mass surrounding deep tunnels——Elasto-plastic analysis of stress field of enclosing rock mass

作     者：WU Hao FANG Qin ZHANG Ya-dong GONG Zi-ming 

作者机构：Engineering Institute of Engineering Corps PLA University of Science and Technology Nanjing Jiangsu 210007 China 

出 版 物：《Mining Science and Technology》 (矿业科学技术（英文版）)

年 卷 期：2009年第19卷第3期

页      面：84-90页

核心收录：

学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学] 

基　　金：Projects 50525825, 50490275 and 90815010 supported by the National Natural Science Foundation of China 2009CB724608 by the National BasicResearch Program of China 

主　　题：enclosing rock mass around deep tunnels zonal disintegration equivalent material Hoek-Brown strength criterion 

摘      要：The zonal disintegration phenomenon （ZDP） is a typical phenomenon in deep block rock masses. In order to investigate the mechanism of ZDP, an improved non-linear Hock-Brown strength criterion and a bi-linear constitutive model of rock mass were used to analyze the elasto-plastic stress field of the enclosing rock mass around a deep round tunnel. The radius of the plastic region and stress of the enclosing rock mass were obtained by introducing dimensionless parameters of radial distance. The results show that tunneling in deep rock mass causes a maximum stress zone to appear in the vicinity of the boundary of the elastic and the plastic zone in the surrounding rock mass. Under the compression of a large tangential force and a small radial force, the rock mass in the maximum stress zone was in an approximate uniaxial loading state, which could lead to a split failure in the rock mass.