非饱和土热力学参数确定的探讨  

Investigation on determination of thermodynamical parameters of unsaturated soil

作　　者：卢应发[1] 吴延春[2] 杨丽平[1] 崔玉军 

机构地区：[1]三峡库区地质灾害教育部重点实验室(三峡大学) [2]华中科技大学土木工程与力学学院 [3]Laboratory of Soil and Rock Mechanics(CERMES),Ecole Nationale des Ponts et Chaussées(ENPC),6 et 8 Av. Blaise Pascal,Cité Descartes,Champs sur Marne,77455 Marne La Vallée cedex 2,France

出　　处：《岩土力学》2008年第7期1747-1752,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(50779030);国防科工委:科工计[2007]838号

摘　　要：研究非饱和土热力学的力学性质,必须建立能量守恒方程,表征能量的两个基本物理力学参数(体积比热系数和热传导系数)的确定是求解能量守恒方程的重要因素。对于不同颗粒组成的土体,对其干燥颗粒有效热力学参数进行了分析,对固体、液体和气体三相共存的热力学参数进行了研究,并对计算结果进行了对比分析,在此基础上,提出了较适合计算热传导系数的方法,并将此方法和体积平均法、自洽法及Hashin-Strikman方法进行了比较。经与试验结果对比表明:提出的方法能较好地描述非饱和土的热力学参数特性。It is necessary to establish the energy conservation equation to research the thermodynamical properties of unsaturated soil the determination of two representative parameters （volumetric specific parameter and thermal conductive parameter） of fundamental physico-mechanical parameters is a key factor to obtain the results of the energy conservation equation. The effective thermal conductive coefficients of dry soil grain are analyzed for different composition geomaterials; and the thermodynamical properties of porous media with water and gas are researched; the comparative analyses of different calculation methods of thermal conductive coefficient have been conducted; an available calculating method is proposed to determine the thermodynamical parameters; the comparisons among the results of the proposed method, the volumetric average method, the self consist method, the Hashin-Strikman method have been made; the proposed method is of the good agreement with the testing result; and it fits to describe the main properties of thermal mechanical conductivity.

关 键 词：非饱和土 孔隙介质 热传导系数 对比分析 

分 类 号：TU43[建筑科学—岩土工程]