| The foundation pit project located in soft soil area is usually adversely affected by groundwater seepage,so it is necessary to consider the changes of seepage field and soil stress field in the excavation process,as well as their interactions.This paper first introduces the theoretical basis of the coupling theory of seepage consolidation,Then the deformation characteristics of foundation pit retaining structure in soft soil area are summarized.Secondly,the geological conditions of hangzhou Fuyang Wanda Plaza deep foundation pit project are introduced.Finally,Abaqus software and the coupling theory of seepage consolidation are used to build a numerical model for calculation in combination with practical engineering.Firstly,the deformation of deep foundation pit under the influence of seepage and consolidation coupling is analyzed.Secondly,the deformation of deep foundation pit without considering the coupling effect of seepage and consolidation is calculated by using the normalizing soil.Then,the calculated results are compared with the measured data.According to the comparison results,it can be obtained as follows:(1)The seepage consolidation coupling has limited influence on the displacement of the top of the supporting structure.In the middle and lower part of the support structure,Considering the seepage coupling,the displacement increased by about 20%compared with that without the seepage consolidation coupling.In the later stage of foundation pit excavation,the maximum displacement increased by about 12.5% when considering the seepage coupling effect compared with that without considering the effect.(2)In the foundation pit engineering under corresponding geological conditions in this paper,Considering the coupling effect of seepage and consolidation,The distance between the point corresponding to the maximum surface settlement and the edge of the foundation pit is 0.5h,and the range of soil disturbance caused by considering the seepage coupling is about twice that without considering the seepage consolidation coupling.(3)In the process of dewatering the foundation pit,The peak position of seepage velocity is 4-5m below the position with the largest displacement of the support structure. |
