孔隙率与饱和度对粉土导热特性的影响

为了研究孔隙率与饱和度对粉土热物理特性的影响,采用ISOMET热特性分析仪对苏州粉土、郑州粉土的重塑样及原状样热物理参数进行测试,从土体三相构成角度分析了粉土热物理参数(导热系数和体积比热容)与孔隙率及饱和度的演化关系。结果表明:当孔隙率一定时,粉土导热系数和体积比热容都随着饱和度增大而增大。粉土的饱和度存在一个临界值,当饱和度小于该临界值时,体积比热容随着孔隙率的增大而减少。孔隙率、饱和度与导热系数成非线性关系,与体积比热容成线性关系。

Influence of porosity and saturation on thermal properties of silty soils

In order to study the influence of porosity and saturation on thermal properties of silty soils,thermal conductivity and specific volume heat of the saturated and unsaturated silty soils from Suzhou and Zhengzhou are measured with the ISOMET apparatus.The evolution relationships between thermo-physical parameters(thermal conductivity and specific volume heat),saturation and porosity are analyzed based on three phase composition of silty soils.The results indicate the thermal conductivity and specific volume heat of silty soils with constant porosity both are increased as saturation increased.The saturation of silty soils has a critical value(Sro).When the saturation Sr is greater than Sro,the specific volume heat is decreased as porosity increased.The relationship of porosity,saturation and thermal conductivity is nonlinear and the relationship of porosity,saturation and specific volume heat is linear.