發(fā)布時間：2018-09-05 05:50

【摘要】：為研究不同土樣類型對土壤熱濕遷移規(guī)律的影響,搭建了一維土柱實驗臺,選取礫砂、粗砂、中砂、細砂、粉砂、黏土6種土樣類型作為研究對象,分別進行了熱濕遷移規(guī)律的實驗研究。實驗結果表明:在初始含水率為5%、熱源溫度為30℃、擊實功為20J實驗工況下,6種土樣在加熱過程中熱遷移表現出差異性,粉砂、細砂和黏土熱遷移效果最佳,礫砂和粗砂次之,中砂熱遷移效果最差。在熱影響半徑內,土體中熱量的傳導與含水率的傳遞相互作用,互為驅動:愈靠近熱源,溫度梯度愈成為水分在土樣中運移的主要驅動力;愈遠離熱源,濕度梯度愈成為溫度傳導的主要驅動力。得到的不同土樣類型在熱濕遷移規(guī)律上的差異性及非飽和土樣熱濕遷移驅動機理可以為解決工程中所遇到的不同土質熱濕遷移問題提供一定的參考依據。
[Abstract]:In order to study the effect of different soil sample types on soil heat and moisture migration, a one-dimensional soil column test bench was set up. Six types of soil samples, gravel, coarse sand, medium sand, fine sand, silt and clay, were selected as research objects. The experimental study on the laws of heat and moisture transfer was carried out respectively. The experimental results show that under the conditions of initial moisture content of 5, heat source temperature of 30 鈩，

本文編號：2223386