基于EFAST法的地下洞室静动力稳定参数全局敏感性分析  

Parameter Global Sensitivity Analysis of Static and Dynamic Stability of Underground Cavern Based on EFAST Method

作　　者：王振[1] 钟登华[1] 朱晓斌[1] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2016年第6期615-623,共9页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金创新群体基金资助项目(51321065);国家自然科学基金重大研究项目(91215301);国家自然科学基金重点项目(51439005)

摘　　要：进行地下洞室静动力稳定参数敏感性的研究,可为地下洞室结构喷锚支护设计提供科学决策依据.本文采用基于全局敏感性分析的EFAST法对地下洞室在静力边界下围岩的应力、变形的参数敏感性进行了分析,并对有限元法与离散元法计算得到的敏感性结果作了对比分析.采用有限元法与块体理论,对块体的稳定性进行了分析,并采用EFAST法研究了块体受围岩岩体参数影响的动力敏感性.结果表明,在静力边界下弹性模量对围岩变形影响的敏感性最大、内摩擦角对洞室最大主应力影响的敏感性最大;对影响块体滑移的岩体参数的动力敏感性分析结果表明,得到的总体全局敏感性较大、一阶全局敏感性较小,表明块体滑移受单一岩体参数变化的影响程度较小,受多种岩体参数的联合作用的影响程度较大.The research on parameter sensitivity of static and dynamic stability of an underground cavern,can be used for underground cavern’s spray anchor bracing structure design to provide a scientific decision basis. The global sensitivity analysis EFAST method is proposed in this paper to analyze the parameter sensitivity of stress and deforma-tion of surrounding rock of underground caverns under static boundary. And the sensitivity results obtained by finite element method and discrete element method are used for comparison analysis. Then,the finite element method and block theory are used to analyze the stability of the block. And the EFAST method is used to study the block dynamic sensitivity under the effect of the parameters of surrounding rock. The results show that under static boundary,the deformation of surrounding rock has the greatest sensitivity to elastic modulus and the principal stress of cavernsshows the greatest sensitivity to internal friction angle. The dynamic sensitivity study of the influence of rock parame-ters on the sliding of rock shows that the overall global sensitivity is great while the first order global sensitivity is relatively small,which illustrates that each single rock parameter has a small effect on block sliding,while the influ-ence from the coupling effect of rock parameters is considerable.

关 键 词：EFAST法 块体 敏感性分析 静动力稳定性分析 地下洞室 

分 类 号：TV512[水利工程—水利水电工程]