基于强度折减法的抗滑桩加固边坡可靠度分析

抗滑桩是一种常用的边坡加固方法。由于天然土体存在不确定性，导致抗滑桩加固边坡的稳定性也存在不确定性，采用可靠度方法可定量考虑上述不确定性。为更加真实地反映不同抗滑桩加固位置下边坡的滑动面，采用强度折减法来计算边坡的安全系数。基于可靠度理论提出一种抗滑桩加固边坡的稳定性评价方法，采用一阶可靠度与响应面法相结合的方法计算边坡的失效概率。为方便应用，开发了基于FLAC^3D的抗滑桩加固边坡可靠度分析程序。采用钢管混凝土桩加固边坡的算例计算结果表明，抗滑桩的加固位置和桩间距对加固边坡的可靠度有重要影响，在相同的桩间距条件下，边坡可能存在一个最优抗滑桩加固位置。

Reliability analysis for soil slopes reinforced with piles using shear strength reduction method

Piles are widely used to reinforce slopes. Uncertainties exist in stability with anti-slide pile reinforced slope due to the uncertainties of soil. Reliability method can be used to quantify the uncertainties. Shear strength reduction method is employed to obtain the factor of safety and slip surfaces with different pile reinforcement locations. A response surface method-based first order reliability method is used to calculate the failure probability. Based on FLAC3D, an automatic programing procedure is proposed for convenient application.Steel pipe piles are adopted for stabilization in the illustrative example. The results show pile location and spacing have significant effect on the reliability of the illustrative example. An optimal location may exist at a certain spacing for the illustrative example. The suggested method can be helpful for the optimal design of pile reinforcement for soil slopes.