考虑界面热阻效应的成层饱和土地基热固结分析  

Thermal Consolidation of Layered Saturated Soils Considering Interfacial Thermal Resistant Effect

作　　者：闻敏杰 王宗琴 涂园 刘开富[1] WEN Minjie;WANG Zongqin;TU Yuan;LIU Kaifu(School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou 310018,China;Engineering Research Center of Rock-Soil Drilling&Excavation and Protection,Ministry of Education,Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]浙江理工大学建筑工程学院,浙江杭州310018 [2]中国地质大学工程学院,湖北武汉430074

出　　处：《应用基础与工程科学学报》2025年第1期213-222,共10页Journal of Basic Science and Engineering

基　　金：浙江省自然科学基金探索项目(LQ22E080010);国家自然科学基金项目(52108347)。

摘　　要：热排水固结法作为一种新型的地基加固方法,可以明显地加速软土地基固结效率.但软土固结过程中热阻效应会降低热量的传递速率.为了预测成层饱和土地基界面的接触热阻,提出了一种广义非完全热接触模型.基于热-水-力耦合理论,建立了变温度荷载作用下成层饱和土地基固结的计算模型.采用Laplace变换得到了温度增量、超静孔隙水压力和位移的半解析解.讨论了界面4种不同热接触模型下两层饱和土地基的热固结特性,考察了接触传递系数R_(T)、局部接触系数η_(T)对热固结的影响.结果表明:由于接触热阻的存在,饱和土界面的温度增量呈跳跃现象,界面附近第一层的超孔隙水压力明显增大,而位移比完全热接触模型的值要小.为热排水固结法在软基处理中的应用提供理论依据.Thermal drainage consolidation method,a new type of foundation reinforcement method can accelerate consolidation rate.However,in the process of soft soil consolidation,the thermal resistance effect will reduce the heat transfer rate.A generalized imperfect thermal contact model is proposed to predict the thermal contact resistance at the interface of multi-layered saturated soils.Based on the coupled thermo-hydro-mechanical theory,the computational model is established for the thermal consolidation of multi-layered saturated soils subjected to time-dependent thermal load.The corresponding semi-analytical solutions of temperature increment,excess pore water pressure and displacement are obtained through Laplace transform method.On basis of this,the characteristics of thermal consolidation of multi-layered saturated soils are investigated under four different thermal contact models,and the influences of contact transfer coefficient and partition coefficient on the thermal consolidation are discussed.It is demonstrated that as considering the thermal contact resistance,there is a jump of temperature increment at the interface,and the excess pore water pressure near the interface in the first layer becomes larger while the displacement is smaller when compared to those of the perfect thermal contact model.The proposed model will provide a theoretical basis for application of the thermal consolidation technique in the ground improvement.

关 键 词：成层饱和土地基 热固结 接触热阻 热-水-力耦合 广义非完全热接触模型 接触传递系数 局部接触系数 LAPLACE变换 

分 类 号：TU43[建筑科学—岩土工程]