渗流-应力耦合作用下基坑开挖变形性状分析

Numerical Analysis of Deep Foundation Pit Deformation Considering Coupled Hydromechanical Effects

大量的基坑事故表明,地下水控制失效是引起事故的重要原因之一。以某基坑开挖为工程背景,借助大型有限元软件Midas-GTS,研究了基坑降水和开挖施工过程中其变形性状,主要分析了基坑周围渗流场的分布、基坑周围地面的沉降、围护桩的挠曲变形和基坑底部隆起。计算结果表明,与未考虑渗流应力耦合作用相比较,在考虑渗流应力耦合作用下设计的基坑更偏于安全。

A large number of pit accidents show that failing in controlling groundwater is one of the important causes of the accidents. Combining with an engineering background, with the large-scale finite element software Midas-GTS, this paper mainly discusses the deformations by considering rainfall and excavation of foundation pit, including the distribution of Seepage field around the pit, ground subsidence around the pit, the deflection of piles and the uplift of excavation face. The results show that the design of foundation pit is safer when considering coupled hydromechanical effects.