抗滑桩加固边坡的稳定性分析及最优桩位的确定

为合理分析抗滑桩加固后的边坡稳定性及确定最危险滑动面和最优桩位、桩长,基于有限元极限分析软件OptumG2建立抗滑桩加固前后的边坡数值模型,通过与已有研究中的边坡算例进行对比,验证了本文数值分析方法的合理性;然后,基于算例验证的对比结果,讨论了OptumG2的2种分析类型(重力乘数与强度折减)的区别并认为基于强度折减极限分析得出的安全系数偏于安全;最后,探讨了边坡坡度及抗剪强度(内摩擦角与粘聚力)对安全系数、最优桩位及桩长的影响,分析了抗滑桩加固后的最危险滑动面变化规律,根据参数分析结果拟合出安全系数公式,得出一些规律性的结论并总结了4种常见的滑动面形式及其形成条件,可为后续边坡稳定性分析理论研究提供参考,具有一定的理论及工程应用价值.

Stability Analysis of Anti-slide Pile Reinforced Slope and Determination of Optimal Pile Position

This paper is to analyze the stability with anti-slide pile reinforced slope and determine the critical failure surface, optimal pile position and pile length. Firstly, a numerical model of slope was established based on the finite element limit analysis software OptumG2. Secondly, two cases were employed to verify the rationality of the numerical analysis. Then, the differences between two different analysis types (gravity multiplier and strength reduction) of OptumG2 were discussed based on the comparison results and the safety factor based on the strength reduction limit analysis was biased towards safety. Finally, the effects of slope angle and soil shear strength (internal friction angle and cohesion) on safety factor, optimal pile position and pile length were investigated. In addition, the variation law of the critical failure surface of anti-slide pile reinforced slope was analyzed and the fitting equation of safety factor was derived based on the parametric study results. Some regular conclusions were presented, and four common sliding surface forms and their forming conditions were summarized. The results can provide reference for the subsequent theoretical research of slope stability analysis.