恒定大气条件下砂土蒸发机制的模型试验研究

发布时间：2018-11-17 08:56

【摘要】：采用大尺寸模型试验对法国枫丹白露砂土的蒸发机制进行研究。利用模型箱进行各种大气条件下砂土上覆水层蒸发试验,验证模型箱的工作性能和蒸发速率的计算方法;而后进行恒定大气条件下的大体积砂土(无上覆水层)水分蒸发试验,研究蒸发过程中大气参数和土体参数的变化,并根据试验结果对砂土蒸发机制和实际蒸发速率进行分析。研究结果表明:模型箱工作性能良好,所采用的蒸发速率计算方法合适;土体温度受土体蒸发过程的影响;土大气交界面存在2个较大的温度梯度;空气的相对湿度随着蒸发的进行逐渐降低;土体蒸发对土体含水量的影响与蒸发时间和土体阻抗有关;土体浅层基质吸力梯度随蒸发的进行逐渐增大。
[Abstract]:The evaporation mechanism of Fontainebleau sand in France was studied by large scale model test. The model box was used to test the evaporation of the overlying layer of sand under various atmospheric conditions to verify the calculation method of the working performance and evaporation rate of the model box. Then the water evaporation experiments of large volume sand (supreme overlying water layer) under constant atmospheric conditions were carried out to study the changes of atmospheric and soil parameters during evaporation. Based on the experimental results, the evaporation mechanism and actual evaporation rate of sandy soil were analyzed. The results show that the model box has good working performance and the calculation method of evaporation rate is suitable; the soil temperature is affected by the evaporation process of soil and there are two large temperature gradients at the interface between soil and atmosphere. The relative humidity of air decreases gradually with evaporation; the effect of soil evaporation on soil water content is related to evaporation time and soil impedance; the suction gradient of shallow soil matrix increases gradually with evaporation.
【作者单位】：同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;法国国立路桥大学Navier实验室;
【基金】：交通运输部陆地交通气象灾害防治技术国家工程实验室资助项目国家高技术发展研究计划(863)项目(2012AA112502)
【分类号】：TU441;TU41

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