Application of modified double-yield surface model in foundation excavation of soft soil
MA Xianfeng1，2，LIU Chang2，XU Liangyi3
(1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；2. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；3. SGIDI Engineering Consulting(Group)Co.，Ltd.，Shanghai 200093，China)
Abstract：In this paper，the double yield surface model with modified plastic work as hardening parameter is introduced into the analysis of Shanghai soft soil foundation pit. Based on experimental data from triaxial consolidation undrained tests and isotropic tests of the Shanghai soft soil，the expression and parameters of elastic part and plastic shear part of the model are modified. The modified model are applied to analysis of soft soil foundation pit engineering in Shanghai soft soil，and three typical foundation pit engineering are selected. Comparing the calculated results with the measured ones，the calculated values are in good agreement with the measured values. The model has good applicability in excavation calculation of soft soil foundation pit in Shanghai.
马险峰1，2，刘 畅2，徐良义3. 修正双屈服面模型在软土基坑开挖中的应用[J]. 岩石力学与工程学报, 2019, 38(S2): 3883-3893.
MA Xianfeng1，2，LIU Chang2，XU Liangyi3. Application of modified double-yield surface model in foundation excavation of soft soil. , 2019, 38(S2): 3883-3893.
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2019, Vol. 38 
