Numerical Analysis Of The Mechanics Property Of Rigid Pile Composite Foundation Under Embankment

With the development of economic of our country, more express way had to be build on soft clay area. It makes Composite Foundation used extensively. As a foundation treatment method, Rigid Pile.Composite Foundation has been proved be helpful to solve the problems such as secondary excavation and vehicles jumped at bridge approaches.Though the construction technology and testing method of rigid pile composite foundation have been developed and the application of the technology is extensive, only a few of the research results published are about the rigid pile composite foundation under embankment. The rigid pile composite foundation under a flexible embankment is not same as that under rigid base in that an embankment provides enough space for pile stabbing into and embankment weight is a kind of flexible load so that their pile-soil stress ratios would be different. So it is not suitable to use the method of calculating and design developed under rigid base. As no flexible field load test has been developed, prototype observation and numerical analysis are reasonable way to study rigid pile composite foundation under embankment.By using ABAQUS FEM soft, the mechanics property of rigid pile composite foundation has been studied in this paper. The influence of interaction between pile and soil has been taken into consideration. The results show that the performances of composite foundation between under flexible foundation and under rigid base have great differences. And the influence of rigid of base has been studied specially.Finally the results of numerical analysis is compared with the results of in-situ test, which prove that through the numerical analysis, the regularity of rigid pile composite foundation under embankment can be mastered.