考虑渗流作用时深基坑开挖坑底隆起变形分析

Analysis on Bottom Heave Deformation of Deep Foundation Pit Excavation by Considering of Seepage Effect

对于软土地区的深基坑工程,坑底隆起变形往往在基坑变形失稳中占有重要位置,而影响深基坑坑底隆起的因素很多,找到它们之间相互影响的规律性,对指导实际深基坑工程中的设计及施工有很大意义。本文通过理论分析及数值模拟方法,同时考虑渗流作用时,对影响深基坑开挖过程中坑底隆起变形的因素进行分析,得出渗透系数增加,会使得坑底隆起变形显著增大等结论。

For deep foundation pit engineering works in soft soil area, bottom heave deformation often occurs in foundation pit deformation and lose of balance which plays an important role in the stability. There are a lot of impact factors causing deep foundation pit heave. Finding the regularity of the interrelation influence to guide the practice of deep foundation pit engineering design and construction has great significance. By using theoretical analysis and numerical simulation method, and taking into consideration of the effect of seepage, the paper makes an analysis of heave deformation factors in deep foundation pit excavation process. The analysis works out the conclusion which shows that with the increase of the permeability coefficient, the heave deformation is significantly increased.