双排桩在基坑支护工程中的滑面预测及受力特性分析

Analysis on Prediction of Slip Surface and Mechanical Characteristics of Double-row Piles for Foundation Pit Reinforcement

以极限分析理论为基础,从能量的角度出发,研究了双排桩在基坑支护工程中的滑面预测方法及受力特性问题。采用竖直条分法,将滑面分割成由若干段组合而成的复合破裂面,在假设边坡岩土体服从摩尔库伦屈服准则与相关流动法则的条件下,结合上限定理,建立双排桩支护力与各参数的多元函数,利用数学优化方法给出最优解,从而可方便地得到滑面形状、位置及其对应的前、后排桩的支护力。

Based on the limit analysis theorem, we studied, in the view of energy, the method predicting slip surface of double-row piles in foundation pit engineering and the mechanical characteristics thereof. By vertical slice method, the slip surface was divided into failure surfaces combined with several segments. On the condition of a assumption that the rock-soil slope subject to Mohr-Coulomb yield criterions and related flow rule, with the upper bound theorem, a multivariate function of the supporting force of double-row piles and the parameters was established and then its optimal solution was given by mathematical optimization method so that the shape and location of slip surface, and the corresponded supporting force from front and rear row piles could be obtained easily.