三维边坡地震永久位移初探  

Preliminary study of seismic permanent displacement of 3D slope

作　　者：卢坤林[1,2] 朱大勇[1] 朱亚林[1] 许强[2] 

机构地区：[1]合肥工业大学土木与水利工程学院,合肥230009 [2]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,成都610059

出　　处：《岩土力学》2011年第5期1425-1429,共5页Rock and Soil Mechanics

基　　金：国家973计划项目(No.2008CB425801);地质灾害防治与地质环境保护国家重点实验室"科技减灾;重建家园"资助项目(No.DZKJ-0318);国家自然基金资助项目(No.40772172);抗震工程技术四川省重点实验室(西南交通大学)开放基金资助项目(No.SKZ200905)

摘　　要：将著名的Newmark有限滑动位移法拓展到三维空间,提出了三维边坡地震永久位移的分析方法。针对潜在滑体,运用三维极限平衡理论确定屈服加速度,借助数值方法获得平均地震加速度,进而依据Newmark的建议计算永久位移量。实例分析表明,该方法计算结果合理;与三维方法相比,二维分析得到的屈服加速度与平均加速度均偏低,永久位移量偏大;偏差量随着滑体长度的增大逐渐减小。An approach for evaluating the seismic permanent displacement of 3D slope is presented,which extends the famous Newmark＇s method to three dimensions.For a certain potential sliding mass,its yield acceleration and average seismic acceleration-time history are obtained from the 3D limit equilibrium theory and numerical analysis,relatively.Then,the seismic permanent displacement is estimated by integrating twice with respect to time over the parts of an average acceleration-time history that exceed the yield acceleration.A case study indicates that the presented method is reasonable.However,by using the traditional 2D method,the yield acceleration and peak of average acceleration are lower and seismic permanent displacement is higher;and the error decreases gradually with the increase of the length of sliding mass.

关 键 词：边坡 地震 永久位移 NEWMARK法 

分 类 号：TU457[建筑科学—岩土工程]