3D Finite Element Analysis of Embankment Reinforced by Geogrid

Adopting the general purpose finite program ANSYS,the authors carried out three dimension finite element analysis of geogrid reinforced embankment in this paper.DP model is chosen to consider the non linearity of soil,the changing status non linearity is considered by surface to surface contact element and the geogrid is modeled by the membrane element.The analysis examines the effect of uncertainty regarding the geogrid modulus,the layers of geogrid and the material property of soft soil.It is shown that reinforcement can significantly reduce the maximum lateral deformation,vertical settlement and foundation heave,and then reduce the differential settlement.These conclusions may be useful to the design and analysis of reinforced embankment on soft soil and the interface between new and old embankments in widened embankment.