基于FLAC3D的倾倒变形岩质滑坡地震反应分析

Seismic Response Analysis of Toppling Deformation Rock Mass Based on FLAC3D

为了评价西南高山峡谷地区倾倒变形岩在地震荷载下的稳定性变化及二次变形发展趋势,文章使用动力分析法对澜沧江上游某在建水电站的一处岩质滑坡进行了研究,通过人工合成与库区相吻合的地震波,分析了滑坡在地震作用下的稳定性。结果表明,倾倒变形岩体节理裂隙发育的浅表层,地震荷载下应变较大,而深部岩体完整性仍然较好,在水电站建设中要着重考虑对倾倒变形程度严重的坡体进行支护,防止发生大规模的失稳破坏。

In order to evaluate the stability change and secondary deformation trend of toppling deformation rock under earthquake load in southwest mountain gorge area,this paper studies a rock landslide of a hydropower station under construction in the upper reaches of Lancang River by using dynamic analysis method,and analyzes the stability of landslide under earthquake action by artificial synthetic seismic wave consistent with reservoir area.The results show that the shallow surface of the toppling deformation rock mass joint fissure development,the strain is larger under the earthquake load,but the deep rock mass integrity is still good.In the construction of hydropower station,it is necessary to consider supporting the slope with serious toppling deformation to prevent large-scale instability and failure.