张掖地区含水沙土冻胀放热的简单分析  

Brief Analysis of Frost Heaving and Heating of Watery Soil in Zhangye

作　　者：董光兴[1] 吴永杰 孙桂华[1] 王新星[1] 葛素红[1] Dong Guang-xing Wu Yong-jie Sun Gui-hua Wang Xing-xin Ge Su-hong(College of Physics and Electromechanical Engineering Hexi University, Zhangye Gansu 73400)

机构地区：[1]河西学院物理与机电工程学院,甘肃张掖734000

出　　处：《河西学院学报》2017年第5期1-6,共6页Journal of Hexi University

基　　金：河西学院校长基金(项目编号:HXXYJY-2014-024)

摘　　要：应用混合法测量了张掖地区不同浓度沙土溶液制成的冻土的熔解热.发现:在1标准大气压、0℃温度条件下由沙土溶液制成的冻土的熔解热随着密度的增大而降低;拟合沙土溶液制成冻土的熔解热与含沙量的函数关系,发现冻土的熔解热基本不受混合物质微粒之间相互作用的影响,可以简化为水的熔解热乘以含水百分比,即冻土的熔解热随着含水率的增加而成正比例增加;建立较为理想的模型计算0.3m^3(表面积1m^2)冻土需要吸放的热量及该热量对本局域表面积1m^2上方近地1.5km高度空气层温度的影响,发现天然冻土在含水率很大的情况下需要热量大,产生温度的变化也大.而农用耕地需要热量较小,对气温的影响也比较小.可以认为,在张掖这种地下水位较高且以农业生产为主的地区,季节性土壤冻胀对局地气温会产生一定的影响,其对应对局地空气温度的改变量约为3℃.Based on Newton＇ s law of cooling to process the experimental data, the paper measures heat of fusion of frozen soil made from the sandy soil solution. The correspondence relationship between heat of fusion of frozen soil and the concentration have been obtained. The results show that the grater the concentration, the less heat of fusion. By measuring the heat of fusion of frozen soil, authors of the paper have verified the physical law that heat of fusion of ice is the biggest and enriching the understanding of the nature frozen soil, and the heat of fusion of frozen soil is equal to the heat of ice multiplying by the moisture content of the frozen soil.

关 键 词：冻土 混合法 熔解热 热量 

分 类 号：O551.1[理学—热学与物质分子运动论]