饱和‑非饱和土一维大变形固结模型  

A One‑Dimensional Large Strain Consolidation Model for Saturated‑Unsaturated Soil

作　　者：周亚东 姜龙飞[2] 郭帅杰 杨伟超 武志杰 ZHOU Yadong;JIANG Lonfei;GUO Shuaijie;YANG Weichao;WU Zhijie(College of Civil Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Soft Soils and Engineering Environment of Tianjin Province,Tianjin Chengjian University,Tianjin 300384,China;China Railway Design Corporation,Tianjin 300251,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]天津城建大学天津市软土特性与工程环境重点实验室,天津300384 [3]中国铁路设计集团有限公司,天津300251

出　　处：《防灾减灾工程学报》2022年第3期553-560,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51608351);天津市自然科学基金项目(18JCYBJC22600);天津市科技计划项目(21YDTPJC00030)资助。

摘　　要：基于分段线性差分法,建立了一种饱和⁃非饱和土一维非线性大变形固结模型UCS2。该模型可考虑土体初始饱和度随深度变化,可分析不同地下水位深度的土体大变形固结问题,并编制了Fortran计算程序。采用现有数值解对该模型进行了验证,UCS2模型分别在饱和与非饱和情况下与现有数值解吻合。开展了大变形算例分析,对比了固结前后孔隙比、饱和度、孔隙水压的变化规律,探讨了地下水位深度及非饱和参数对土体固结沉降的影响。Based on the piece-linear finite difference approach,a one-dimensional nonlinear large strain consolidation model for saturated-unsaturated soils,called UCS2,is developed.The model considers the variation of soil initial saturation degree with depth and can solve large strain consolidation prob⁃lems of soil at different groundwater tables.Fortran programming package is utilized to implement the computation of the model.The existing numerical solutions are used to verify the proposed model,and the model shows good agreement with the existing solutions in saturated and unsaturated cases,respectively.Then an example analysis of large strain consolidation was carried out using the UCS2 model,which compared the variations of void ratio,saturation degree,and pore water pressure at dif⁃ferent consolidation stages,and investigated the effect of the groundwater table depth and unsaturated parameters on soil consolidation settlement.

关 键 词：饱和-非饱和土 非线性 大变形固结 饱和度 地下水位 

分 类 号：TU318[建筑科学—结构工程]