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建立了一维土壤高温热湿迁移实验装置,获得了温度场和湿度场的动态变化规律,提出了温度峰值比和湿度峰值比的概念。实验结果表明,土壤温度场和湿度场均呈现明显的峰值特征,尤其在热源附近处表现更为剧烈,最大温度峰值比和湿度峰值比均超过2.0。湿度峰值主要发生在初始饱和度为4%~18%的范围内,且温/湿度峰值现象的总体变化特征呈相反趋势,湿度峰值时间大于温度峰值时间。对于远离热源的地方,温/湿度峰值现象表现逐渐微弱,且出现时间相对滞后。结合光学显微分析表明,由温度梯度引起的土壤水分的蒸发-扩散-冷凝过程是温/湿度峰值现象的重要产生机制之一。
A one-dimensional soil hyperthermia heat and moisture migration experimental set-up was established. The dynamic changes of temperature field and humidity field were obtained, and the concept of temperature peak ratio and humidity peak ratio was proposed. The experimental results show that the soil temperature and humidity fields show obvious peak characteristics, especially in the vicinity of the heat source is more intense, the peak temperature and humidity peak ratio of the maximum are more than 2.0. The peak value of humidity mainly occurred in the range of 4% ~ 18% initial saturation, and the overall change of temperature / humidity peak phenomenon showed the opposite trend, and the humidity peak time was greater than the temperature peak time. For places far away from the heat source, the temperature / humidity peak phenomenon gradually weak, and the relative lag time. Combined with optical microscopic analysis, it is shown that the evaporation-diffusion-condensation process of soil moisture caused by temperature gradient is one of the important mechanisms of the peak temperature / humidity phenomenon.