The Mechanics Property Of Rigid Pile Composite Foundation In Roadbed

The Mechanics Property of Rigid Pile Composite Foundation in RoadbedIn these days, composite foundations have been extensively used. Especially the rigid pile composite foundation is paid attention to in Practice engineering. But less research work has been done, this paper works on it.The first, site experiment is carried out. the paper analyze in-situ testing data of subgrade which is made up of plain concrete pile composite foundation and agitation pile composite foundation including pore pressure, layer settlement of soils between piles, earth pressure, lateral deformations. It is found mat many factors under working load are different between agitation pile composite foundation and plain concrete pile composite foundation, and analyze the reasons, describe the factors of two composite foundations under working load.The second, the module of the ground consisted of construction garbage is inverse analyzed with finite element analysis. Then some mechanics rule of rigid pile(plain concrete pile) composite foundation is educed. The rule of settlement and pore stress is educed too. Then it is compared with the case which is found in site.Finally, the paper studies the computing method of pile to soil stress ratio of rigid pile composite foundation with cuhion, and these conditions are thought that the top of pile pierce into cushion and the bottom of pile pierce into underlayer.lt is assumed that the cushion is ideal elastic mass and ideal elastic-plastic mass, then the formula is developed and all parameters 'effects to stress ratio of pile to soil are discussed.