深基坑桩锚支护结构桩间距的确定

摘要

Based on the stress characteristics of soil arch between anchored piles, taking the u-nified strength theory to analyze soil arch strength, and starting from calculation model of parabolic soil arch under distributed loading, the rational calculation formula of spacing between anchored piles is put forward, by which the static equilibrium equation and intensity condition of the soil arch can be satisfied simultaneously. Compared with the calculation results based on the Mohr-Coulomb failure criterion, the proposed method can consider the effect of intermediate principal stress, and being much more close to the reality of working properties of the supporting structure.%基于桩锚支护结构桩间土拱受力特征,将统一强度理论引入桩间土拱强度分析,以均布荷载作用下抛物线土拱为计算模型,给出了满足桩间土拱静力平衡条件和强度条件的桩间距计算公式.与基于Mohr-Coulomb 强度准则的桩间距计算结果相比较,本文方法可考虑中主应力对土拱强度的贡献,计算结果更为符合支护结构的实际工作性状.