Finite element analysis of the bearing and settlement performances of pile-net composite foundation

Based on the software of finite element method(ABAQUS),the bearing and settlement performances of pile-net composite foundation under embankment load are analyzed by means of numerical simulation. The influence of the stiffness of the geosynthetics,the thickness of the cushion,the elastic modulus of piles and the pile distance on the load transfer in the composite foundation,the stress ratio of pile and soil,the surface settlement and the lateral displacement of roadbed are analyzed. By analyzing simulating results,some features are found on the bearing and settlement performances of pile-net composite foundation. For example,when the stiffness of the geosynthetics is increased,the differential settlement of pile and soil and the lateral displacement of roadbed are greatly reduced,and the stress ratio of pile and soil is increased;with increasing the thickness of the cushion,some mechanical behaviors such as sharing of load and pile-soil stress ratio are obviously improved. All these are of some significance to design and construction of pile-net composite foundation in the future.