Analysis Of The Pile End Mechanisim Of Jacked Pile In Layered Soil

In recent years,jacked pile has been widely used in soft groundsill and densely populated large cities for its advantages.In actual project,it is still in the selection of pile penetration resistance depends on experience or semi-experience level,the mechanism about the pile end resistance and side friction and the distribution between pile and ground is hard to grasp,the mechanism of the different layered ground during piling is not clear,it is difficult to select the pile's type and equipment,etc,and lead to serious economic losses.Therefore,the core of solving the problem lies in the revelation of the development of the pile end resistance and the actual physical process of the jacked pile sinking.This paper research obviously working mechanism of pile sinking lag behind the engineering application of this status,especially in geotechnical academia few to research the characteristics of the jacked pile in layered ground.In the process of jacked pile layered foundation pile end resistance of the working properties were studied as follows:(1)Based on the status and theoretical analysis,the model test of jacked pile sinking process is designed.Compared different process of continuous pile foundation model tests,to reveal the development mechanism of jacked pile end resistance in the process of pile sinking,and research on the mechanical properties of resistance on the pile end.(2)According to model tests,using the theory of particle flow,choice parameters and contact constitutive model,establish the numerical simulation which is corresponding with model tests.In this paper,a numerical simulation method is used to simulate the actual physical working process of pile end.Particle flow simulation is carried out for the jacked pile sinking process,and the development of pile end resistance is observed.Through the comparison with theoretical analysis and model tests,the research is verified.On the basis,the limitations of theory and experimental research are overcome,the influence parameters of macro view are optimized and the research results are improved.