| 摘要: |
| 通过自制的冻结与监测装置，进行了不同干密度和含水量条件下非饱和黄土的温度变化试验。试验结果显示，当干密度增大，土壤的导热能力将被削弱，随着冻结过程的不断进行该影响因素的作用不断增强。含水量对冻结中土体温度的变化也存在显著影响；含水量较高的土体降温更为剧烈，稳定状态时的温度也更低。通过对试验数据的分析，进一步得到了不同干密度与含水量的土体温度与温度梯度同冻结位置和时间的分段函数关系。回归结果表明：冻结初期，含水量是影响土体温度与温度梯度的主要因素，含水量越大降温越剧烈；而在冻结的后续阶段，温度与温度梯度的变化则受干密度与含水量的共同影响，随二者的增大土体降温程度逐渐减弱。 |
| 关键词: 黄土 冻结 温度 含水量 干密度 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目（50678144） |
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| Temperature in freezing unsaturated loess affected by dry density and water content |
| GAO Yuan, ZHANG Xiao-hui, ZHANG Cai-yang |
| () |
| Abstract: |
| By using developed test and monitoring equipment, the experiment was carried on to study on the temperature of unsaturated loess under different conditions of dry density and water content. The test data revealed that the heat conduction of soil would be impaired when dry density increased, and the effect enhanced gradually as time went on. Water content also had obvious influence to change the
temperature of freezing soil. For the soil of higher water content, the temperature dropped sharper; and was lower at the steady stage. Regression analysis was carried out on the test results which showed that soil temperature and temperature gradient appeared staging a function with freezing position and time. It was pointed out that water content was the main factor of the temperature and temperature gradient of loess in early freezing stage. And this dropped more severely with increasing water content. While the change of soil temperature was the result of the combined effect of dry density and water content in late freezing stage. And with increase of both them the degree of dropping temperature of soil was decreased. |
| Key words: loess freezing temperature water content dry density |
