考虑工程桩影响软土深基坑隆起破坏的数值模拟研究

Numerical simulation of failure mechanism of deep foundation pits in soft soil considering impact of piles

摘要: 利用 FLAC 数值模拟软件,针对软土超深基坑,通过 5 组模型计算,研究了地连墙插入深度、墙趾土层特性、基坑宽度、坑内工程桩对抗隆起稳定的影响规律以及作用机理。结果表明地连墙插入深度、墙趾土层特性、基坑宽度和潜在滑裂面之内的工程桩对基坑抗隆起稳定有着非常明显显著的影响。在此基础上,研究了软土深基坑坑底隆起失稳破坏时滑裂面的形状和位置等特征以及其影响因素,得到了软土深基坑隆起失稳破坏机制。

Abstract: Based on the numerical simulation technique and 5 groups of model calculations, the impacts of uplift of wall depth, soil characteristics of wall toe, pit width and pit piles on stability are studied. The results show that the wall depth, soil characteristics of wall toe, pit width and piles within potential slip surface have significant impacts on the stability of the pit. Further, the slip surface shape and location characteristics of deep soft soil pit are studied as well as their influencing factors. Finally, the uplift failure mechanism of deep soft soil foundation pits is obtained.