基于FLAC^(3D)的滑坡地震动力响应分析

Seismic Dynamic Response Analysis on Landslide by FLAC^(3D)

以FLAC3D数值模拟计算为主要研究手段,结合某工程滑坡实例,从动力角度对地震作用下滑坡体稳定性和动力响应,以及设置抗滑桩后的防护效果进行了研究。结果表明:在地震作用下,滑坡(无抗滑桩)产生的最大总位移、最大水平位移均位于滑坡体的中后部;滑坡(无抗滑桩)水平位移在地震作用结束后,仍呈发散趋势,滑坡体可能处于不稳定状态,后续变形将继续发展;设置抗滑桩后,滑坡产生的最大水平位移、最大总位移相比设桩前滑坡体位移量明显减小,设桩后滑坡体内剪应变集中区域明显减小;在抗滑桩加固后,滑坡体的水平位移时程曲线呈现收敛趋势,滑坡体趋于稳定。

Based on a landslide sample, the landslide stability, dynamic response and the protection effectiveness＇ of anti-slide pile is studied by FLAC^3D numerical simulation. The results show that under the action of earthquake, landslide （ no anti slide pile） produced both of the maximum total displacement and the maximum horizontal displacement locating in the central-rear part of sliding body. The horizontal displacement under earth- quake action of landslide （ no anti-slide pile） after the end still shwed divergent trend, sliding body may be in an unstable state, subsequent deforma- tion will continue to development. After setting anti-slide pile, under the action of earthquake occurring, the maximum horizontal displacement and maximum total displacement of landslide displacement and decreased obviously, the pile in the landslide shear strain concentration area is obviouslyduced. After setting the anti-slide pile, landslide displacement time-history curve shows convergence trend, the sliding body tends to be stable.