Analysis of Reinforcement of High Liquid Limit Foundation by Geogrid Reinforced Cushion

According to the features of high liquid limit foundation in southwest mountainous area and the characteristics of geogrid reinforced cushion,geogrid reinforced cushion was used to reinforce high-liquid foundation.By using the elastic-plastic finite element analysis method,the mechanisms of the geogrid reinforced cushion were studied.Results show that geogrid reinforced cushion can greatly reduce loading and deformation and improve the high-liquid foundation stability.In addition,the effect of factors such as the location,layers,stiffness,etc.of geogrids on reinforcement and the regularity were discussed.The result of comparison of centrifugal model test result with numerical calculation results indicates that the error is negligible between them,which shows that(1)constitutive relationship,calculation model and calculation parameters are proved to be reasonable;(2)numerical simulation reflects deformation behavior of high-liquid foundation improvement effectively and the results of numerical analysis are reliable.