NUMERCIAL ANALYSIS OF GEOGRID AND PLASTIC DRAINAGE PLATE USED IN EXISTED RAILWAY ALTERATION PROJECT

摘要

To fit the demand of train speeding, existed railway should be widened, which causes the redistribution of the stress in the consolidated soft soil foundation that leads to unequal post-construction settlement, influences the stability of the roadbed. To eliminate above diseases, geogrid and plastic drainage plate usually be used. The paper uses FEM from aspects as layout manner, length, stiffness, interaction effect of geogrid, whether use plastic drainage plate and its span to analyze the stability of roadbed, max unequal post-construction settlement and consolidation time. The following conclusions are obtained: Geogrid apparently improves the roadbed slope stability of each stage, but has little effect on unequal post-construction settlement and consolidation; Plastic drainage plate apparently accelerates the consolidation and decreases the unequal post-construction settlement of roadbed. It has little effect on stability after consolidation; In roadbed widening project on soft soil foundation, geogrid and plastic drainage plate all have its work and should be used in combined way to perform the better engineering effect.