Numerical Simulation Analysis of Column Uplift in Deep Foundation Excavation Process
In the process of deep foundation excavation,the column and the erect column pile will produce the problem of uplift,and the large difference between the adjacent columns will have an adverse effect on the stability of the internal support system.Combined with a deep foundation excavation project in Zhengzhou City,Henan Province,the finite element method is used to calculate and analyze the uplift of the column and the erect column pile.The variation law of the uplift of the column and the working characteristics of the erect column pile during the excavation of the foundation excavation were discussed in depth.The influence of the uplift of the column on the internal force of the support system is analyzed.The calculation results show that the uplift of the column is mainly controlled by the uplift deformation of the base soil and increases with the increase in the excavation depth of the foundation excavation.The longer the erect column pile,the smaller the uplift of the column.It is an effective measure to reduce the uplift of the column by increasing the length of the erect column pile,which,however,will also increase the tensile stress of the pile.The uplift of the column will significantly change the internal force distribution of the support system,and the excessive differential settlement of the column will significantly increase the internal force of the support system.Therefore,in engineering design,it is recommended to reasonably select the length of the erect column pile to control the uplift of the column and avoid excessive differences in the length of adjacent erect column piles.
foundation excavationsupportscolumnupliftinternal forcefinite element analysis
万方数据
维普
