基于坑角效应的桩锚支护设计优化研究

Design Optimization of Pile-Anchor Support Based on Pit Angle Effect

本文以长春市某桩锚支护深基坑工程为依托,通过对其工程资料进行整理分析并建立有限元模型,对该基坑的开挖过程进行数值模拟。通过分析开挖时其支护结构的变形规律,发现坑角处支护结构的变形远远小于中部支护结构的变形,即该基坑存在明显的坑角效应。且根据相关公式计算出了该基坑坑角效应的影响范围,并提出了两种关于坑角效应影响范围内的支护结构优化方案,分别是增大锚索间距与减小支护桩桩径,利用有限元模拟对两种优化方案进行比选分析,最终得出增大锚索间距为该基坑最佳的优化方案。

Based on a pile-anchor deep foundation pit project in Changchun,this paper carries out numerical simulation on the excavation process of the foundation pit by sorting out and analyzing the engineering data and establishing the finite element model.By analyzing the deformation law of the supporting structure during excavation,it is found that the deformation of the supporting structure at the pit corner is much smaller than that in the middle of the pit,that is,there is an obvious pit angle effect.And according to the formula to calculate the influence of the excavation pit angle effect,and put forward the two kinds of angle effect on pit supporting structure within the scope of optimization scheme,is increasing the anchor spacing and reduce supporting pile diameter,two optimization scheme to make use of finite element simulation comparison analysis,finally it is concluded that increasing the anchor spacing for the best optimization scheme of foundation pit.