基于GA算法与有限元耦合的岩土力学参数应力反分析方法研究  

Study on the stress inverse method of mechanical parameters based on coupling of genetic algorithm and finite element

作　　者：袁振华 卢伟 YUAN Zhenhua;LU Wei(Hangzhou Company, China Railway Tunnel Group, Hangzhou 310000, China)

机构地区：[1]中铁隧道集团杭州公司,浙江杭州310000

出　　处：《铁道科学与工程学报》2017年第7期1428-1434,共7页Journal of Railway Science and Engineering

基　　金：中铁隧道集团科技创新计划资助项目(隧研合2013-30)

摘　　要：由于岩土工程的复杂性和不确定性,致使岩土力学参数很难准确获得。位移反分析方法是目前获取岩土力学参数的主流方法。但常规反演算法存在无法跳出局部最优解、易陷入"维数灾难"等缺陷。同时,位移监测具有滞后、测量误差大等缺点,致使反演结果存在不唯一性。针对以上问题,基于非参数统计模型对参数进行灵敏度分析,剔除灵敏度小的参数,有效提高反演效率。并提出岩土力学参数GA算法与有限元耦合应力反分析模型,该模型采用应力反分析方法,克服常规算法反演过程中易陷入局部极优的难题。最后通过实例验证模型的有效性。Because of the complexity and uncertainty of geotechnical engineering,it is difficult to accurately obtain the geotechnical parameters.The displacement back analysis method,among others,is one of the prevailing methods for backcalculating parameters;however,the conventional inversion algorithm is unable to avoid locally optimal solution and often encounters defects such as“dimension disaster”.meanwhile,displacement monitoring has significant disadvantages such as lag,measurement error,and so on,thus leading to the non-unique inversion results.To tackle the above-mentioned problems,the sensitivity of the parameters was analyzed based on nonparametric statistics with those insensitive parameters eliminated,which in turn improved the efficiency of the inversion.Subsequently,the stress of the rock mechanics parameters was put forward by coupling the GA algorithm and the finite element analysis,and the model adopted the stress back analysis method.It overcomes the deficiency of conventional algorithms that is easy to be trapped in local optimal solutions.Finally,the validity of this model was demonstrated through a case study.

关 键 词：岩土工程 力学参数 应力反分析 参数灵敏度 GA算法 

分 类 号：TU45[建筑科学—岩土工程]