饱和土一维大变形非线性热固结模型  

One-dimensional large strain nonlinear thermal consolidation model for saturated soil

作　　者：周亚东[1] 李龙辉 陈思源 ZHOU Yadong;LI Longhui;CHEN Siyuan(Key Laboratory of Soft Soils and Engineering Environment of Tianjin,Tianjin Chengjian University,Tianjin 300384,China)

机构地区：[1]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

出　　处：《岩石力学与工程学报》2023年第9期2306-2314,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51608351);天津市自然科学基金资助项目(18JCYBJC22600)。

摘　　要：基于分段线性有限差分法,建立饱和土层一维大变形非线性热固结模型TCS2。该模型将土层热传导与固结变形相耦合,可以考虑土体自重、大应变、非线性压缩性和渗透性关系、温度效应和固结变形影响下土性参数的非线性变化。采用Fortran编写计算程序,并对该模型进行验证。小变形情况下,TCS2数值解与基于小变形假设的热固结解析解一致;大变形非线性条件下,TCS2数值解与室内试验实测值基本吻合。结合算例分析,进一步探讨土体自重、应变大小和应力路径对饱和土层热固结的影响,忽略土体自重、固结变形,以及简化的压缩性和渗透性关系,对土层热固结分析会产生较大误差。Based on the piecewise-linear finite difference approach,an one-dimensional large strain nonlinear thermal consolidation model for saturated soil,called TCS2,is presented.The model couples soil heat conduction with consolidation deformation,and accounts for the soil self-weight,large strain,variable hydraulic conductivity and compressibility,and nonlinear variation of soil parameters during the thermal consolidation process.The Fortran was used to compile the calculation program,and then the model was validated.The numerical solutions of TCS2 involving small strain are in good agreement with the analytical solution of thermal consolidation based on the assumption of small deformation.Under the large strain nonlinear condition,the calculation results of TCS2 are basically consistent with the measured values of laboratory tests.Then,the effects of soil self-weight,large strain and stress path on thermal consolidation of saturated soils were further investigated using example problems.Neglecting the soil self-weight,consolidation deformation and the simplified compressibility and hydraulic permeability relationships will lead to significant errors in a thermal consolidation analysis.

关 键 词：土力学 饱和土 大变形 热固结 非线性 数值模型 

分 类 号：TU43[建筑科学—岩土工程]