均质土坡抗震稳定安全度拟静力分析方法探讨  

Discussion on pseudo-static aseismic stability analysis of homogeneous soil slope

作　　者：李阳[1] 李同春[1] 

机构地区：[1]河海大学水利水电学院,南京210098

出　　处：《水力发电学报》2011年第6期85-89,共5页Journal of Hydroelectric Engineering

基　　金：水利部公益性行业科研专项经费项目(201001035)

摘　　要：利用拟静力法进行边坡抗震稳定分析时,地震荷载按照现行《水电水利工程边坡设计规范》(DL/T5353-2006)中建议,采用土石坝地震加速度动态分布系数图确定。但是由于边坡为单面凌空,因而动力特性和土石坝有明显不同。本文采用有限元结合反应谱法对具有相同高度的边坡和土石坝进行动力反应分析,结果表明边坡的加速度放大系数和土石坝有很大的不同,采用规范中规定的土石坝的动态分布系数是不合理的,进而提出了边坡的地震加速度动态分布系数的建议线,并以此确定地震荷载。同时采用算例证明了建议线的合理性。If a pseudo-static method is used to analyze the aseismic stability of homogeneous soil slope of an earth-rock dam,according to The codes of engineered slopes in water resources and hydropower projects（DL/T5353-2006）,calculation of earthquake load relies on the figure of seismic coefficient.The slopes with a single free surface,however,have different dynamic features from the ones of earth-rock dam.In this work,finite element method and response spectrum method were adopted to analyze the seismic acceleration distribution of soil slope.The results show that seismic coefficient of soil slope is much different from that of earth-rock.To avoid the errors in using such a seismic coefficient,new figure of seismic coefficient is put forward for calculation of soil slope under earthquake load.Application of this figure in a numerical example shows the efficiency and reliability of the proposed method.

关 键 词：均质土坡 拟静力法 反应谱法 加速度分布系数 

分 类 号：TV312[水利工程—水工结构工程]