摘要
地下洞室的开挖将会导致围岩应力重分布,在洞室周围产生扰动区,扰动区包括塑性变形区和弹性变形区。分析了开挖卸荷后围岩应力状态的变化,并利用弹塑性力学原理,探讨了地下洞室开挖导致的局部应力集中对应力重分布的影响规律;在此基础上,利用塑性区单元体应力平衡方程和摩尔—库伦准则建立了塑性区半径计算公式,可用来确定圆形洞室开挖扰动岩体临界破坏深度。
The underground caverns＇ excavation will lead stress concentration and cause the surrounding rock stress redistribution even form a disturbed zone which consists of elastic and plastic zone around the cavity. In the paper changes of the surrounding rock＇s stress state after the excavation unloading are analyzed, and using the principles of elastoplastic mechanics to discuss the affecting rule of local stress concentration to stress redistribution that caused by cavities＇ excavation. On the basis, a calculation formula of plastic zone＇s scale with element stress equilibrium equation and Mohr-colomb criterion is proposed which can be used to determine the critical failure depth of the surrounding rock in circle cavities.
作者
赵翔
魏玉峰
郝腾飞
王小群
ZHAO Xiang;WEI Yu-feng;HAO Teng-fei;WANG Xiao-qun(State Key Lahoratory of Geohazard Prevention and Geoenvironment Protection （Chengdu University of Technology）, Chengdu 610059, China;State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource ＆ Hydropowcr, Sichuan University, Chengdu 610065, China)
出处
《公路》
北大核心
2018年第4期264-268,共5页
Highway
基金
中国博士后科学基金,项目编号2016M590890
地质灾害防治与地质环境保护国家重点实验室自主研究课题,项目编号SKLGP2016Z016
关键词
围岩
扰动区
塑性区
临界破坏深度
摩尔-库伦准则
研究
surrounding rock
disturbed zone
plastic zone
critical failure depth
Mohr-colomb criterion
study
