孔隙比与饱和度对粉质黏土导热系数影响的试验研究

Experimental Study About the Influence of Void Ratio and Saturation on the Thermal Conductivity of Silty Clay

以长春市城市快速轨道交通3号线东延线的粉质黏土为研究对象,制备不同条件下的重塑样.通过室内试验,利用DRPL-I型导热系数测试仪,采用稳态法测定不同条件下粉质黏土的导热系数,研究孔隙比与饱和度对粉质黏土的导热系数的影响.结果表明:粉质黏土的导热系数受其孔隙比与饱和度的影响;在一定条件下,当饱和度一定、孔隙比增大时,粉质黏土的导热性能减弱,导热系数随着孔隙比的增大而减小且呈近似线性减小;在孔隙比一定、饱和度增大的条件下,随着液相体积的增大,饱和度对粉质黏土的导热性能的影响有所提高,表现为导热系数随着饱和度的增大而线性增大.

Taking the silty clay in the eastern extension of the urban rapid rail transit line 3 in Changchun as a research object,the remolded samples were prepared. Through indoor experiments,utilizing DRPL-I thermo conductivity measurer and the conductivity of silty clay obtained by steady-state method under different conditions,the influences of void ratios and saturation on the thermal conductivity of silty clay were investigated. The results show： the thermal conductivity of silty clay is influenced by the void ratio and saturation; under some conditions,when the saturation is constant and the void ratio increases,the thermal capacity of sily clay weakens,the thermal conductivity decreases with the void ratio increasing,and the decreasing trend approximates linear; when the void ratio is constant and the saturation increases,the influence of saturation on the thermal conductivity of sily clay enlarges with the volume of liquid phase enlarging,and the thermal conductivity linearly enlarges with the saturation enlarging.