OPTIMIZING PARAMETERS OF GEOGRID FOR SUBGRADE CONNECTING IN HIGH-SPEED RAILWAY

摘要

In order to study optimizing construction parameters of laying geogrid for subgrade connecting in highspeed railway, the centrifuge model test and numerical simulation methods were adopted. According to results of test and simulations, deformation distribution of subgrade section was obtained. It showed that application of geogrid could effectively enhance subgrade integration property and foundation bearing capacity, which observably resulted in reducing differentia settlement of the junctions of the new subgrade and the old, the old subgrade surface and the part under the sleepers. Moreover, the pre-deformation of subgrade after applying geogrid was large while the post-deformation was small that could decrease post-construction settlement. By numerical simulation calculating of geogrid location, economic width and the layer number, a reasonable optimizing scheme applying double-layers geogrid to subgrade was confirmed. It will be instructive to control differentia settlement for the connecting subgrade projects in high-speed railway.