边坡土体侧移模式对抗滑桩影响分析

在开挖、降雨或地震等外部因素作用下，边坡土体很容易进入局部或瞬态大变形乃至失稳滑动，使抗滑桩产生附加位移及弯矩。基于两阶段分析方法，采用Winkler模型模拟抗滑单桩与土之间的相互作用，建立单桩水平位移控制方程组，根据内力与位移的连续条件得到考虑不同土体侧移模式下求解桩身响应的矩阵解析表达式，并采用现场监测数据及Poulos弹性理论进行验证，证明该方法是合理可行的，并通过参数分析土体侧移对抗滑桩水平承载性状的影响程度。分析结果表明，土体侧移模式包括最大侧移值、分布形状及重心、侧移势等，对抗滑桩的挠度和弯矩均有显著影响，在工程设计中应予以充分重视。

Effect of lateral soil movement modes on behavior of stabilizing piles

For many unstable slopes,local or transient large displacement often occurs,even collapse due to excavation,rainfall or earthquake.The large lateral soil displacement may generate additional internal forces and deflection in stabilizing piles.Based on the two-stage method,the Winkler’s model is adopted to simulate the effect of pile-soil interaction,and the horizontal displacement control equations of a single pile are established.By considering the continuity condition and the boundary conditions,the analytical solutions of control equations are obtained and verified by monitoring data and Poulos’s elastic continuum method.Finally,with the typical engineering accident,the influence of lateral soil movements on adjacent stabilizing piles in slope is investigated by parametric analysis.It shows that the pile deflection and bending moment are obviously affected by soil lateral movement model,such as maximum displacements,distribution shapes and center of gravity,displacements energy,etc,on which it should be pay more attention practically.