推移式滑坡与锚拉桩相互作用的数值模拟研究

摘要

The numerical generalized model of thrust-type landslide considering the actual construction conditions and mechanical characteristics of anchored anti-slide piles is established by adopting FLAC3D.The whole process analysis on the pile-soil interaction of anti-slide pile is conducted through simulating the deformation process of thrust-type landslide by controlling the displacement boundary conditions of the trailing edge of the slide body.The results show that under the great initial prestress of the anchor cable,the flexural deflection of pile occurred toward the inside of the slope and in the mean time,considerable reverse bending moment are produced,which cannot be ignored in the design and calculation of anchored anti-slide piles.The increase of initial tension and stiffness of anchor cable will rise the action point of the landslide thrust.%运用FLAC3D建立了考虑锚拉桩实际施工工况及受力特点的推移式滑坡数值概化模型.通过控制滑体后缘的位移边界条件来模拟推移式滑坡变形由后向前传递的过程,进行了抗滑桩桩土相互作用全过程分析.结果表明:在巨大的锚索初始预应力作用下,桩向坡体内侧挠曲变形,同时也产生了数量可观的反向弯矩,这在锚拉桩的设计计算中是不可忽视的;锚索的初始张拉力、锚索刚度的增大都会使滑坡推力的作用点增高.