地基液化对边坡稳定影响的动力固结耦合分析

An Analysis of Dynamic Coupled Consolidation of Slope on Liquefiable Soil

针对饱和砂土地基上边坡的动力离心模型试验,应用固液耦合动力有限元方法研究了可液化地基上边坡的地震响应,重点分析了地基发生的液化对边坡加速度、变形和稳定的影响规律。结果表明,在坡前水平地基内孔压增长较小,边坡下部地基内孔压增长较大;饱和地基液化导致坡脚和坡顶位移较大;饱和地基和坡脚液化导致的边坡大变形对边坡稳定性有较大影响,液化是导致边坡失稳的主要原因。

With an aim at the dynamic centrifuge test on slope with saturated sand subgrade,the seismic responses of slope on liquefiable soil are studied using the nonlinear coupled finite element method.Also,this paper mainly analyzes the effect of occurrence of foundation liquefaction upon the laws of slope acceleration,deformation and stability.The results indicate that the pore pressure within the level foundation prior to the slope increases smaller while the pore pressure within the foundation below the slope increases larger;the liquefaction of saturated foundation results in the larger displacement at the slope toe and crest;the slope sharp deformation caused by the saturated foundation and slope toe liquefaction can have the great impact upon the slope stability.Accordingly,liquefaction is the main cause to result in the slope to lose its stability.