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传统滑坡推力计算,通常应用不平衡推力法进行抗滑桩设计。但对于多排抗滑桩治理工程的设计,常规方法无法准确计算每排桩上的推力大小以及分布形式,而有限元强度折减法计算滑坡推力遵循桩-土相互作用原则,可以得到桩后推力与桩前抗力分布形式。以十堰一天水高速某多级剪出口滑坡为研究对象,通过对破碎岩石老滑坡的成因与滑动机制进行分析,明确促使滑坡复活的各种因素。在此基础上应用Plaxis软件建立有限元模型,通过数值计算方法得到边坡开挖过程、降雨过程与强度折减过程3种不同工况下抗滑桩桩后推力与桩前抗力的分布情况,进而得到每排抗滑桩的滑坡推力分担比。该方法避免了传统方法存在的种种局限性,为多排抗滑桩设计提供一种行之有效的解决办法。
Traditional landslide thrust calculation, usually using unbalanced thrust method anti-slide pile design. However, for the design of multi-row anti-slide piles treatment project, the conventional method can not accurately calculate the size and distribution of thrust on each row of piles. However, the thrust reduction of landslide calculated by finite element strength reduction method follows the principle of pile-soil interaction, And the form of resistance distribution before pile. Taking Shiyan-Tianshui high speed multi-level shear-export landslide as the research object, by analyzing the causes and sliding mechanism of the old broken landslide, the various factors that promote the revival of the landslide are clarified. On this basis, Plaxis software was used to establish the finite element model. The distribution of anti-slide pile post-thrust and post-pile resistance under three different working conditions of slope excavation process, rainfall process and strength reduction process were obtained by numerical calculation. Then the share of landslide thrust of each row of anti-slide piles is obtained. The method avoids the limitations of traditional methods and provides an effective solution for the design of multi-row anti-slide piles.