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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。
The thermal conductivity of petroleum contaminated soils with different water content, pollution intensity and oil-water phase content was tested indoors. The results show that when the dry density and the pollution intensity are certain, the thermal conductivity increases with the increase of the water content. When the dry density and water content are certain, with the increase of the pollution intensity, the thermal conductivity decreases first and then increases and then decreases The influence of temperature on its thermal conductivity mainly depends on the occurrence of soil water phase in each temperature range. The inherent mechanism of change is: the location, phase state and content of oil and water inside the soil and the thermal conductivity of the soil itself determine the size of the thermal conductivity. The research results provide important parameters for the quantitative research, evaluation and prediction of environmental problems such as the spread and migration of petroleum pollutants, as well as the research on heat transfer, mass transfer and thermal stability of petroleum contaminated soils. Freezing damage formation process and other mechanisms to provide the basis for interpretation.