Analysis of Consolidation Deformation Process of Soft Foundation Based on Simplified Finite Element Model

LIU Kelun;LIU Hongjun;CHENG Huaxiong;College of Civil Architecture, Wuyi University;Guangzhou Geotechnical Investigation Institute of Building Material;

Equivalent vertical wall method;;equivalent method by Chai;;soft soil foundation;;finite element analysis;;monitoring data

In order to verify the applicability of plane strain equivalent model to shaft foundation, combined with a municipal road soft soil foundation processing project, the equivalent vertical wall method and equivalent method by Chai are used in Plaxis for finite element analysis. And the results of the two simplified models are compared with the monitoring data. The results show that: ①The preload method of the plastic drainage plate has good effect in soft soil foundation treatment, and the settlement in loading period accounted for 60% of the total settlement. At the end of preloading, the consolidation degree has reached more than 90%, effectively reducing the construction period and post-construction settlement. ②The magnitude of shallow subsidence and deep horizontal displacement and the dissipation rate of excess pore water pressure obtained by the two simplified models are both slightly larger than the field measured data which have a higher fitting degree. ③Compared with the two simplified models, equivalent method by Chai is simpler, more explicit in physical meaning, and more efficient in calculation. The research results provide the basis for the treatment and design of the soft soil foundation in this area.