大断面软岩硐室开挖非线性力学特性数值模拟研究  

Research on the non-linear mechanics characters of large section cavern excavating within soft rock by numerical simulation

作　　者：何满潮[1,2] 李春华[3] 王树仁[3] 

机构地区：[1]中国地质大学 [2]中国矿业大学(北京校区)北京100083 [3]中国矿业大学

出　　处：《岩土工程学报》2002年第4期483-486,共4页Chinese Journal of Geotechnical Engineering

基　　金：国家杰出青年基金资助项目 (5982 51 1 4 )

摘　　要：运用三维有限差分数值计算软件 (FLAC3D) ,模拟分析了软岩大断面硐室围岩由于开挖方法、开挖顺序的不同而产生不同时效变形与应力状态的力学响应及变形特性。研究结果表明 ,软岩大断面硐室的开挖过程是和应力路径与应力历史密切相关的非线性不可逆过程 ,其开挖设计方案应采用软岩非线性大变形力学设计方法 ,即首先采用力学对策设计 ,然后进行过程优化设计 ,最后进行最优参数设计 。In this paper, FLAC3D is adopted to simulate the mechanical behavior and deformation characteristics with different excavating method and excavating sequence of large section cavern within soft rock. The research results have showed that the excavating process is a non linear irreversible process tightly related with stress paths and stress history.The non linear mechanics design method, which include mechanics countermeasure design, process optimization design, optimized parameter design,should be adopted in excavation plan design of large section cavern within soft rock.So the surrounding rock of cavern should be in stable state.

关 键 词：软岩 大断面硐室 开挖 非线性 力学特性 数值模拟 

分 类 号：TU454[建筑科学—岩土工程]