基于有限单元法的岩土边坡动力稳定分析及评价方法研究进展  

RESEARCH ADVANCES ON THE SEISMIC STABILITY ANALYSIS AND EVALUATION OF ROCK-SOIL SLOPES BASED ON FINITE ELEMENT METHOD

作　　者：张国栋[1,2] 刘学[3] 金星[1] 李勇[1,2] 肖尚斌[1] 

机构地区：[1]三峡大学土木水电学院,湖北宜昌443002 [2]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [3]中国水利水电第七工程局,四川成都610016

出　　处：《工程力学》2008年第A02期44-52,共9页Engineering Mechanics

基　　金：湖北省自然科学基金项目(2007ABA039);湖北省教育厅科学研究基金项目(D200713002);三峡大学科学研究基金项目(SD20041203)

摘　　要：该文给出了基于有限元法的岩土边坡动力稳定分析的主要方法,对这些分析方法进行了较为详细的表述和分析,在此基础上提出了平均地震系数计算的新方法,即对潜在滑动区域分块按有限元法计算地震系数,进而再按拟静力法计算安全系数。为了考虑滑动体变形对地震稳定系数和永久变形的影响,应建立地震响应与地震永久变形相耦合的计算方法。指出边坡在地震荷载作用下产生的永久位移或累积变形作为边坡稳定性评价指标是科学合理的。最后提出了基于性态的边坡抗震设计方法,包括边坡抗震性态水准的划分、性能指标的建立和抗震设计方法。The seismic stability analysis of rock-soil slopes based on finite element method （FEM） are given in this paper. A new average seismic coefficient method is proposed, where the seismic coefficient of the potential sliding block is determined using the FEM, and then the safety factor is calculated according to the pseudo-static method. In order to consider the influence of slip deformation on seismic stability and permanent deformation, the coupled computational method of seismic response and permanent deformation should be established. It is a scientific and rational method where permanent displacement or accumulated deformation is used as slope stability evaluation index. Finally, the performance-based seismic design method is proposed, including the classification of performance level of slopes, the definition of performance index and the seismic design method.

关 键 词：岩土边坡 永久变形 有限单元法 地震稳定性评价 安全系数 

分 类 号：P315.9[天文地球—地震学] TU457[天文地球—固体地球物理学]