考虑桩反作用力和设计安全系数的滑坡推力计算方法—传递系数隐式解法

Calculation method of landslide thrust considering the reaction force of piles and factor of safety—implicit solution using transfer coefficient

目前采用的滑坡推力计算公式(传递系数法)中缺少了抗滑桩的支护抗力参数,造成计算误差。在基于强度折减安全系数的传递系数隐式解法基础上,考虑桩与滑坡体的相互作用,在条块的受力体系中加入抗滑桩的水平反作用力,然后按照设计安全系数对滑面强度参数进行折减,使得最后一个条块的剩余下滑力刚好等于0,此时对应的水平反作用力就是作用在桩上的水平滑坡推力设计值,按此水平滑坡推力加固滑坡后的稳定性系数正好等于设计安全系数。

A simplified method for estimating the landslide lateral loads acting on the stabilizing piles,called unbalanced lateral load transfer method,has been used for decades in China. However,the method do not consider the reaction force of piles in the force components acting on a typical slice,which may result in calculation errors. This paper presents a modified formula based on the unbalanced lateral load transfer method. The horizontal reaction force of pile is added into the force components acting on a typical slice. In this way,the horizontal lateral loads acting on the stabilizing piles can be estimated through the strength reduction（the reduction method is equal to the target factor） based on the force equilibrium analysis. As a result,the estimated stability factor of safety of landslide reinforced by stabilizing piles is equal exactly to the target factor of safety.