门式双排抗滑桩设计计算方法及工程应用研究

门式双排抗滑桩是一种较为新型的支护结构,首先考虑前、后桩及连系梁作用,推导了滑坡推力作用下双排抗滑桩桩间土压力计算公式;然后,针对门式双排抗滑桩受力特点,将抗滑桩划分为受荷段与嵌固端,采用工程中常用的地基系数“m-k”法推导了各特征段的微分方程,在此基础上,根据前、后桩及连系梁的边界条件,利用有限差分方法对微分方程求解,建立了门式双排抗滑桩内力及位移计算方法.工程实例分析验证了该方法的可行性,可为类似工程设计提供参考.

Design Calculation Method and Engineering Application Study of the Double-row Anti-slide Piles

Double-row anti-slide piles are a relatively new type of support structure.This issue first considers the effects of front and rear piles and the coupling beams.Derive the equation of earth pressure between double anti-slide piles under landslide thrust force; then focus on the mechanical characteristics of gantry double piles,divided the pile into two part,namely loaded part and fixed part,adopt the commonly used ＂m-k＂ ground coefficient to derive the differential equations of each feature segment.Based on the boundary condition of front and rear piles and coupling beams,solved the differential equations by finite difference method,and established a method to calculate the force and displacement of double anti-slide piles.Analysis of project examples verified the feasibility of this method.This issue can provide a reference for similar projects.