Numerical Analysis On Properties Of Composite Foundation With Long-short-piles

Combined with long-short-pile composite foundation in Zhengzhou-Xi'an passenger-dedicated lines, based on the program of MARC, the paper uses FEM of plan to research the properties of long-short-pile composite foundation under embankment load, and estimate result of long-shout-pile compositon foundation treatment. The research conclusion as follow: 1 .the purpose of using shout piles is eliminating collapsibility of collasibal loess, and increase bearing capacity of subsoil. So the variety of short pile parameter has little influence on deformation of long-short-pile composite foundation; 2.the long pile deformation modulus and cohesion have great influence on bearing capacity and deformation of long-shout-pile compositon foundation. The improvement of long plie deformation modulus improves bearing capacity and deformation of composite foundation; 3.Because the deformation modulus of soil under short poils, the deformation modulus short poils, to prevent destruction of soil under short poils. 4. the cushion deformation modulus has influence on deformation compatibility and load distribution between poils and soil.