Finite Element Fine Analysis Of The Rigid Net Grid-pile Group Composite Foundation

Rigid Net Grid-pile group composite foundation as the new way of strengtheningtechnologies for soft clay foundation which consists of rigid gird, micropile structure、transition、subcrust、tension reinforcement net and soft soil foundation Load is applied to thetransition subcrust transferred to the rigid gird,then transferred to deep soil through themicropile groups, and the tension reinforcement net can also transfer some load to the rigidgird. This composite foundation can’ t only restrict the side deformation of soft soil, but alsogive full play to the strength an the deformation properties of the soil by the connect of rigidgird and than strength the soil effectively, comparing with the traditional way which cancontrol the pile-soil stress ratio to complete the project goal.This article as a very important part of the study on properties of the rigid grid-micropilegroups composite foundation, mainly present the rigid grid-micropile groups the way ofreinforcement method and the research result of pile-web composite foundation, then use thetheory of finite element analysis the law of load path in order to gain the formula offoundation bear the weight of load. and lays a good theoretical foundation for futureexperiment research and engineering spread. The major work of this paper is focused onseveral aspects as follows:1. On account of the research actualities of composite foundation and the shortcomingsof soft soil foundation reinforcement currently, this article put forward a good reinforcementeffect, low-cost soft soil foundation reinforcement technique（the rigid gird-micropile groupscomposite foundation reinforcement method）, and describes its main components.2. Introduce the basic principles of the finite element method, build the geometry modeland then use GTS form a FEM model;3. Analyses the impact of the pile-soil modulus ratio, rigid mesh stiffness, pile spacing,pile length, tension network flexibility, pile diameter, subcrust thickness and other parameterson the deformation and the ability of bearing the load of the rigid gird–micropile groupscomposite foundation, then guide the project.4. Through the above model calculation results, find the formula of foundation bear theweight of load and provide some specific suggestions to the project.