某黄土深基坑围护结构变形数值分析与优化

Numerical Analysis and Optimization Research on Deformation of Retaining Structure of a Certain Deep Foundation Excavation in Loess

目前西安地区在地铁深基坑围护体系的选型上,大都按照沿海软土地区的变形控制标准进行设计,并没有考虑黄土的自稳性较好这一特征。采用大型有限元软件ANSYS,对西安某地铁车站围护结构变形进行分析,并通过与实测数据对比,证明黄土的稳定性较好,原设计方案偏于保守。用深基坑支挡结构分析计算软件对影响围护结构变形的诸因素进行了优化分析,提出了设计和施工中应注意的因素以达到控制排桩围护结构变形和节省造价的双重目的。

At present, most of the retaining system of deep excavation in Xi＇ an is designed according to the deformation control standard in coastal soft soil area, but the good self-stability of loess is ignored. The authors use the ANSYS to analyze the deformation of retaining structure of a certain subway station in Xi＇an. Moreover, through comparing the calculated and measured data, it reflects that the stability of loess is better and the original designs are somewhat conservative. Then influential factors on the deformation of retaining structure are analyzed, which is specially designed for calculating retaining structure of deep foundation excavation. At last, attention factors in design and construction are proposed to control deformation of retaining structure and save cost.