抗滑桩加固土坡效果及合理桩位的三维有限元分析

基于ABAQUS有限元软件,采用弹塑性有限元强度折减法对抗滑桩加固的土坡进行三维数值分析.考虑桩-土相互作用,探讨强度折减法中以迭代不收敛和特征点位移拐点作为边坡失稳判据的局限性.对于抗滑桩加固的边坡,提出采用特征点位移拐点并结合水平位移限值作为边坡临界破坏的评价标准,分析边坡潜在最危险滑动面和安全系数随抗滑桩桩位变化的规律,从数值模拟角度探讨边坡加固中桩位的合理设置位置.

3-dimension FEM analysis of effect on soil slopes reinforced by anti-slide piles and reasonable pile locations

Based on the software of ABAQUS, combined with the strength reduction method in elastoplastic FEM, 3-dimension numerical analyses on the soil slopes reinforced by anti-slide piles was conducted. Considered the pile-soil interaction, the limitations of slope collapse criterion in numerical non-convergence and characteristic position displacement inflexion with the strength reduction were discussed. Slope collapse criterion of characteristic position displacement inflexion combined with horizontal displacement limitation was provided for slopes reinforced by anti-slide piles. The variation laws of the critical slip surfaces and safety factors of slopes with changed pile locations were discussed. The reasonable locations of anti-slide piles were obtained by numerical simulation method.