地震作用下边坡动力系数有限元分析.pdf

4 6 Vol.4 2008 12 Chinese Journal of Underground Space and Engineering Dec. 2008 * 地震作用下边坡动力系数有限元分析 1 2 许年春 , 石维力 , 石东虹 ( 1. , 401 1; 2. , 10002; . , 400020) : 地震对边坡稳定性有重要影响, 地震波在坡体内会产生动力放大 应, 动力系数 受边坡形态的影响采用有限元方法作边坡动力分析时, 根据边坡固有频率和坡体阻尼比确 定出阻尼矩阵, 选取合理的计算域宽度, 边界采用人工一致边界, 地震加速度输到基底动力 分析结果表明, 坡度越大, 边坡动力系数越大, 动力系数沿坡高方向是变化的, 坡脚处最小, 坡 顶处最大, 以滑裂面以上楔体重心处的动力系数作为地震作用下边坡的动力系数值较合理, 对 于工程上较陡的边坡来说, 动力系数在 1. 6- 1. 8 之间 : 地震; 动力系数; 一致边界; 有限元分析 : T U457 : A : 167 08 6( 2008) Finite Element Analysis on Dynamic Coefficient for Slopes Subjected to Earthquake Load 1 2 XU Nianchun , SHI Weili , SHI Donghong ( 1. Chongqing Univ ers ity of Science Technology, Chongqing 401 1, China; 2. Zhej iang Design Institute of Water Conservancy an H y roelectric P ower , Zhej iang 10002, China; . Chongqing S urv ey Institute, Chong qing 400020, China) Abstract: Earthquake has great effect on the stability of slopes, the seismic wave will be amplified in the slope and t he dynamic coefficient particularly susceptible to the slope shape. In this paper, FEM is used to car ry out dynamic analysis for slopes, the damping matrix is got based on the natural frequency and damping ratio of the material, generalized consist ent boundary condition is set and t he EIcentro earthquake records was input to the base boundary as seismic acceleration.