边坡地震响应的动力有限元分析

边坡的地震响应是一个复杂的命题，也是近年来的的热点，尤其是“ 5.12 ”地震以后。目前，动力有限元是解决边坡地震响应问题行之有效的方法之一 , 它以地震时程加速度作为反映地震荷载的主要因素，能够定量地反映出地震时程加速对边坡不同的应力场、位移场、运动速度的影响。以某水电站坝前一个受“ 5.12 ”地震所诱发复活的巨型滑坡为例，运用动力有限元软件，对该滑坡进行了地震荷载作用下的响应分析，计算得出了地震作用下该滑坡产生的水平垂直动位移、加速度、最大剪应力场。最后，图示说明了滑坡在地震作用下的往复振动对其稳定性的影响，得到了该滑坡的安全系数时程曲线，各项计算结果量值与地震后滑坡实际量值一致，这表明“ 5.12 ”地震是导致该古滑坡复活的直接原因。

Dynamic Finite Element Analysis on Landslide Seismic Response

The seismic response of landslide is a complicated proposition, and it '' s also the hot spot in recent years, especially after the “ 5.12 ” Earthquake. At present, the dynamic finite element is one of an effective way to solve the dynamic response problem of landslide. In the dynamic finite element, earthquake acceleration is the major factor which reflects the seismic loading, and the impacts of the earthquake on the stress field, displacement field and velocity of the landslide. By using a giant landslide in front of some hydropower dam as an example which was induced by the “ 5.12 ” earthquake, the seismic response analysis of the landslide has been done by a dynamic finite element software, with which the displacement acceleration and the maximum shear stress of the seismic response of the slope have been calculated. Then the status of the reciprocating vibration on the impact of the stability of landslide is illustrated. Finally, the safety factor duration curve of the landslide is got, the calculated results are consistent with the actual displacement of the landslide after the earthquake, it shows that the “ 5.12 ” Earthquake is the direct factor inducing the ancient landslide resurrection.