新岩滑坡地震与交通动荷载响应分析

摘要

To research the effects of dynamic loads on landslide stability,based on the Xinyan landslide on the Wangyan highway in Jilin Province,a finite element model was established with the help of GeoStudio,then earthquake loads with different PGAs and traffic vibration loads were input.The influence of these dynamic loads on landslide was reflected through the changes of landslide stability coefficient.Through comparing before and after the inputs,it was found that stability coefficient of landslide decreased under dynamic loads and the decrease value under the traffic vibration loads was larger than that under the earthquake loads.Therefore,it can be concluded that the landslide stress and stability are greatly influenced by these two dynamic loads,and especially the influence of traffic vibration loads is larger.The results can provide certain reference for stability evaluation and supporting design of highway landslide under dynamic loads.%为了研究动荷载对滑坡稳定性的影响,以吉林省在建汪延高速公路上的新岩滑坡为依托,借助GeoS-tudio软件建立有限元模型,输入不同峰值加速度的地震荷载与模拟交通震动荷载,通过滑坡稳定性系数的变化来研究2种动荷载对滑坡的影响.通过加荷前后的对比发现,施加动荷载后滑坡稳定性系数均大大降低,并且施加交通震动荷载后稳定性系数下降值略大于施加地震荷载后的下降值.由此可知,在该滑坡中这2种动荷载对滑坡内应力及稳定性影响较大,特别是交通震动荷载对其稳定性影响更大.研究结果可为公路滑坡在震动荷载作用下的稳定性评价及支护设计提供一定的参考依据.