基于QUAKE/W和SLOPE/W下甘家寨滑坡地震动力响应分析及稳定性评价

Seismic Dynamic Response Analysis and Stability Evaluation of Ganjiazhai Landslide Based on QUAKE/W and SLOPE/W

以鲁甸地震甘家寨滑坡为例,运用QUAKE/W模块分析地震作用下滑坡加速度、速度、位移的动力响应情况;将QUAKE/W结果导入SLOPE/W中,结合安全系数及永久位移,评价水平地震动与水平、竖向地震动共同作用下的滑坡稳定性。研究表明:滑坡监测点的加速度、速度、位移存在滞后性和放大效应;水平地震下滑坡安全系数降低并产生0.381 m的永久位移,滑坡失稳;相比水平地震动,水平、竖向地震动的共同作用使滑坡稳定性明显降低。

In order to analyze the dynamic response of the acceleration,velocity and displacement of the earthquake,the QUAKE/W module was used for landslides in Ganjiazhai triggered by Ludian earthquake.After importing results of QUAKE/W into SLOPE/W,the stability of landslides under horizontal ground motions and cooperations of horizontal and vertical ground motions was evaluated by combining the safety factor and permanent displacement.The research shows that there exists hysteresis nature and amplification effect in the acceleration,velocity and displacement of the landslide monitoring points.The safety factor of the landslide is reduced and the permanent displacement is about 0.381 m under the horizontal earthquake with the unstable landslide.Compared with horizontal earthquakes,the cooperation of horizontal and vertical earthquakes reduces the stability of the landslide obviously.This result provides the reference case for the analysis of dynamic response and stability evaluation of landslides under earthquake.