Comparative Study on Treatment Schemes for Differential Settlement of Subgrade

In the process of highway subgrade widening,the loads of new subgrade and caused by postconstruction transport service may give rise to serious uneven settlement of the old and new subgrade;moreover,the interaction of the old and new subgrade may bring about post-construction settlement,leading to adverse effect on the driving thereon. Therefore,taking a widened highway subgrade as an example,the typical treatment methods for the differential settlement of the old and new subgrade were studied with ABAQUS,a FEM software,and then compared with the widened subgrade that was untreated,thus the change law of subgrade settlement controlled by geo-grid and cement-soil piles was concluded. The result of numerical analysis shows that geo-grid has limit effect on control of uneven settlement of widened subgrade,while pile foundation has good effect.