石油污染土体导热系数变化规律和变化机制

室内测试了不同含水量、污染强度、油水相含量的石油污染土体的导热系数。研究结果表明:干密度和污染强度一定时,其导热系数随含水量的增加而增大;干密度和含水量一定时,随污染强度的增加呈现先减小后增加最后又减小的变化趋势;温度对其导热系数的影响主要取决于各温度区间土体水相的赋存状态。内在的变化机制是:土体内部油、水的赋存位置、相状态、含量以及土体自身的导热性能共同决定了其导热系数的大小。研究成果为定量研究、评价和预测石油污染物扩散、迁移等环境问题以及石油污染土体传热、传质和热稳定性问题研究提供了重要参数;为冻土区环境恶化、冻土退化、冻害形成过程等机理性解释提供依据。

Processes and Mechanisms of Thermal Conductivity Change of Soils Polluted by Petroleum

The thermal conductivity of soils changes significantly after petroleum pollution and it was measured in laboratory with different oil and water contents,oil concentrations,and temperatures to study the change mechanisms.The research results showed that the thermal conductivity increased with increasing water content when the dry density and oil concentration were kept constant.It firstly increased,then decreased,and finally increased again with progressively increasing oil concentration when the dry densit...