断层附近应力分布的异常和对隧洞稳定的影响  

Abnormal Stress Distribution Adjacent to a Fault and It's Influence on Stability of Tunnel

作　　者：朱维申[1] 阮彦晟[1] 李晓静[1] 王文涛[1] 

机构地区：[1]山东大学岩土与结构工程研究中心,济南250061

出　　处：《地下空间与工程学报》2008年第4期685-689,共5页Chinese Journal of Underground Space and Engineering

基　　金：(90510019,50579033);国家重点基础研究发展规划(973)项目(2002CB412705)

摘　　要：研究了断层附近的应力和位移分布异常以及隧洞围岩应力场及其稳定性如何受断层的影响。通过系统的数值仿真试验来研究断层厚度、断层倾角、断层弹模、地应力侧压系数等四个主要因素的影响。采用正交与均匀试验设计方法,应用有限差分法分析方法,对16种计算工况进行分析,得到了规律性的结果。最后对隧洞接近断层时围岩稳定状况的变化做了弹性、弹塑性分析。并对围岩发生脆性破裂的可能性做了典型分析对比。This paper studies abnormal distribution of stress and displacement adjacent to a fault as well as how stress field of tunnel surrounding rocks is influenced by a fault. According to systematic numerical simulation test ,it studies the influences of four primary factors of fault：thickness, fault dip, fault deformation modulus and lateral pressure coefficient of initial stress. Using test design of orthogonal and uniform method, applying analysis method of FLAC -3D, and analyzing 16 basic schemes of calculated conditions,regular results have been gained. At last, as tunnel approaches fault, elastic and elastic - plastic analysis on changes of surrounding rocks stability are conducted. And possibilities of brittle fracture are analyzed and predicted.

关 键 词：断层 应力分布 隧洞稳定性 

分 类 号：U458[建筑科学—桥梁与隧道工程]