Numerical modeling of shear strength in a two-layer soil reinforced with geogrid

摘要

The technique of ground improvement using geosynthetics has been developed extensively over thernlast few decades. Geosynthetics are used to reinforce soils and improve their mechanicalrncharacteristics, especially when soft low-bearing capacity soils encountered in civil engineeringrnprojects. Particularly, in roads, geosynthetics are placed between the interface of granular materialsrnand soft-soil sub grade to improve the bearing capacity of composite layers. This paper presents thernresults of the finite element analysis of the two-layer soil (granular base-clayey sub grade) reinforcedrnwith geogrid and discusses the effect of the reinforcement on the shear strength. The numerical modelrnwas calibrated by comparison with experimental results of Large scale direct shear tests. The resultsrnhave shown that the shear strength was improved in the two-layer soil reinforced with geogrid. Thernpredictions made by the developed model are found to be in good agreement with experimental datarnobtained from large scale direct shear tests.