双排抗滑桩桩土作用分析模型及其应用

考虑坡体滑移的最不利工况,以滑动面为分界面,分析了双排桩与坡体作用的作用机理与关系表达式;引入p-y曲线法模拟桩间土与双排桩接触非线性特征,并结合经典土压力理论与相关应力路径三轴试验对其参数进行了求解,由此建立了双排抗滑桩与桩周土体非线性相互作用模型。在此基础上,导出双排桩不同特征桩段微分方程,利用横系梁传力协调作用及边界条件,提出了双排桩桩身内力和位移的有限差分迭代算法。试验对比分析表明,计算值与实测值吻合较好,该方法可用于双排抗滑桩的内力分析计算。

The Analysis Model of Pile-soil Interaction for the Double-row Anti-slide Piles Structure and its Application

The mutual effects between piles and slope in two parts of the anti-slide piles and slope system,bounded with the sliding surface,is proposed by considering the most unfavorable condition;in addition,the p-y curve method is used to describe the nonlinear contact of the pile and the soil between back pile and front pile.Therefore,a nonlinear interaction model for double-row anti-slide piles and soil with some parameters which determined by traditional earth pressure method and triaxial test in some certain stress path is established.Based on this,the differential equations of pile sections with different characteristics are deduced,so the inner force and displacement of double-row anti-slide piles can be obtained by finite difference solution with the consideration of the tie beam＇s coordinating action.Finally,Comparing to the measured data of the model test in laboratory,the calculation result shows that it is feasible for adopting the finite difference solution to analyze the double-row anti-slide piles.