抗滑桩加固边坡稳定性影响因素的参数分析

PARAMETRIC ANALYSIS ON FACTORS INFLUENCING STABILITY OF SLOPES REINFORCED BY ANTI-SLIDE PILES

抗滑桩加固是滑坡治理的常用方法。本文采用强度折减有限元法分析了影响抗滑桩加固边坡稳定性的若干因素,计算了边坡抗滑桩在坡顶分级堆载过程中的桩身弯矩、剪力、位移和边坡安全系数,揭示了桩位、桩长等因素对抗滑桩加固边坡稳定状态的影响规律,获得了最优桩位及临界桩长等抗滑桩优化设计要素,为排桩的优化设计提供参考依据。并对抗滑桩在坡顶分级堆载下的桩身受力、变形特性及规律进行了分析。发现桩头水平位移在坡顶分级堆载下以指数函数形式发展,并建立了变形预测数学模型,为桩身变形控制提供了参考依据。

The use of anti-slide pile to reinforce the slope is a common method for landslide control. This paper considers the performance of a homogeneous isotropic slope reinforced with one row of piles. The strength reduction finite element method is used to analyze the effect of anti-slide pile reinforcement of several factors on the slope stability. It calculates the anti-slide pile bending moment,shear force,displacement and safety factor of the slope under the process of slope grading load. The results reveal the influence of pile position,pile length and other factors on the stability of slope. For each of these parameters,the safety factor of the slope,the optimal pile position and the critical length measure of the pile are assessed. The results provide reference basis for optimizing design of the pile row. Furthermore,the body stress and deformation characteristics of pile and laws under the grading loadingare analyzed. It finds that the horizontal displacement of pile head under the step loading with exponential function forms of development. It then puts forward the deformation prediction mathematical model to provide basis for the deformation control of pile.