双排抗滑桩加固边坡稳定性与荷载传递机制分析

Numerical Analysis on Stability and Load Transfer Mechanism for Slope Stabilization with Double Row Sliding Piles

为探讨不同双排桩布桩形式下的阴影效应及抗滑桩-边坡体系的稳定性,考虑三种双排桩布桩形式,采用基于强度折减的有限元方法开展了桩头自由和固定约束条件下抗滑桩加固边坡的三维数值计算,获得了抗滑桩-边坡体系整体稳定性安全系数、潜在滑动面以及桩身内力分布情况,并与单排抗滑桩工况进行了对比研究。在此基础上,结合三类双排桩在不同深度处的主压应力分布图,深入探讨了相邻抗滑桩间的土拱效应、后排桩与前排桩间的荷载传递机制。研究表明,当双排抗滑桩加固潜在滑移坡体时,不同深度、不同布桩型式下的土拱效应不同,桩间的土拱在一定程度上反映了双排抗滑桩的作用机制和加固效果。

To investigate the shadow effect and stability of pile-slope system under different pile arrangement for double row piles,the three cases for the double row piles under free and fixed pile head are respectively considered to calculate the pile’s internal forces,critical sliding surface and safety factor for the pile-slope system with the Shear Strength Reduction Finite Element Method（SSR-FEM）.Then,the obtained results are compared with those obtained in single row piles.Based on the above analysis,the soil arching effect between the adjacent piles in the same row and the load transfer between the rear and front row of piles for the three cases are thoroughly discussed combined with the principal compression stress distribution at different depth.The results show that when the double row stabilizing piles are inserted in a potential sliding slope,the soil arching effect will be different under the various depth and pile arrangement for double row piles.The soil arching effect can reflect the work performance and reinforcement effect of double row stabilizing piles to a certain extent.