| In recent years,along with the widely construction of infrastructure,cement-flash-gravel(CFG) piles composite foundation is widely applied in project. Good engineering and economic effects have been produced by using CFG composite foundation. CFG composite foundation is the single-pile composite foundation,which is more applied in project.However, little engineering applications and theoretical studies have been done on the CFG piles and Mixed-in-Place piles (MIP) composite foundation,which is the rigid-flexible and double piles composite foundation. In view of this instance,this paper elaborate the bearing characters of this composite foundation on deep soft soil.With the example of the New Station of YingKou,of which high-speed railway from Dalian to Harbin and the research method of field test and numerical simulation,this paper rearch on the each bearing charactor of CFG plie,MIP pile,soil and mutual effect of the three structures.CFG pile is the rigid pile, which is the main pile of the CFG and MIP composite foundation.This paper study on the load transfer of CFG pile.At the same time,the bearing charactors of the raft are been explain. In addition,this paper detailed study on the settlement of the bottom of the raft.By deep studies in this paper, following conclusions are drawn:(1)The forced law and foundation base settlement trend of the CFG and MIP composite foundation are been given in this paper; (2)With the computer language of MATLAB and the data of field test, this paper get the distribution charactors of side friction of CFG pile;(3)Using the Analysis software of PLAXIS,this paper construct the numerical model.With the numerical model,this paper analyse the bearing charactors of the composite foundation;(4) The comparative analysis of the data of field test and the numerical simulation have been given in this paper in order to verify the accuracy and the reliability of the data of field test. |
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