摘要
传统有限元强度折减法在边坡稳定性数值分析中取得了一定的成功,但由于未考虑岩土体材料参数的变异性等不确定性因素,尚不能直接应用于边坡稳定性特别是动力稳定性可靠性分析问题。为此提出了基于有限元强度折减法的地震边坡动力稳定性可靠性分析方法。将有限元极限分析法、动力分析法和可靠性分析法三者耦合,分析求解边坡在地震作用下的动力稳定性可靠性问题,并将这一过程在数值计算程序中得以实现。在计算分析过程中,克服了原方法需不断人工试算才能得到边坡安全系数而无法量化处理问题,并对边坡动力失效准则进行了适用于程序化的改进,使其计算过程完全实现自主运行。结合典型算例分析结果表明,该方法显著的特点是能较全面地反映岩土体的动力特性和边坡岩土体材料强度参数的变异性及相关性,所得结果相对更加合理且更符合工程实际。该方法既是对有限元强度折减法的应用范围的有益推广,也为边坡动力稳定性可靠性问题研究提供了一条新的有效途径。
The traditional strength reduction finite element method（SRFEM） is widely used in numerical analysis of slope stability.However,for the lack of considering geotechnical uncertainties,it still cannot be directly applied to the reliability analysis of slope stability,especially the dynamic stability problems.Thus,based on the SRFEM,the reliability analysis method of slope dynamic stability under seismic loading is proposed.In this method,the finite element limit analysis,dynamic analysis and reliability analysis are included to analyze the reliability problems of slope under seismic loading;and above process is realized in the numerical calculation program.For the traditional method,the acquirement of slope safety factor should be based on continuous manual pilot calculations,which makes batch processing impossible.But in the proposed method,above problem is solved through the improved slope dynamic failure criterion and the corresponding calculation program.The case study shows that the proposed method is significantly different from the general methods;it can relatively comprehensively reflect the dynamic characteristics of rock mass,the variability and correlation of material parameters.The results are closer to the reality.The proposed method not only widens the application scope of SRFEM,but also provides a new effective way for the reliability analysis of slope dynamic stability.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2013年第7期2084-2090,共7页
Rock and Soil Mechanics
基金
中国科学院山地灾害与地表过程重点实验室开放基金(No.IMHE200803)
成都理工大学"地质灾害防治与地质环境保护"国家重点实验室开放基金(No.GZ2007-04)
西部灾害与环境力学教育部重点实验室(兰州大学)开放基金(No.Klmwde201003)
后勤工程学院青年科研基金资助项目(No.YQ11-43206)
关键词
边坡
有限元
强度折减法
动力可靠度
可靠性分析
slope
finite elements
strength reduction method
dynamic reliability
reliability analysis
