加载过程中结构-冻土界面红外辐射温度场研究

为获取加载过程中结构-冻土界面温度场的时空分布规律，采用红外热辐射成像技术对模型桩-冻土界面上红外辐射温度场的产生、发展及其演变过程进行了试验研究。结果表明：模型桩在加载直至滑移过程中，桩-冻土界面处存在红外辐射温升现象；桩-冻土界面发生滑移前，红外热图上低温区域在密度和范围上均逐渐减小，距离冻土试样表面不同深度D处温升幅度?T和影响宽度W随时间而逐渐增加，但相同时刻?T和W随深度D的增加而减小；桩-冻土界面发生滑移后，红外热图上的高温区成带状分布，并趋于贯通，最大温升幅度?Tmax和温升影响的最大宽度Wmax随深度D的增加呈线性减小规律。研究结果可为红外热辐射成像技术应用于冻土地区结构-冻土界面温度场测试提供参考。

Research on infrared radiation temperature field of fabric-frozen soil interface during loading process

In order to reveal the loading temperature distribution law of fabric-frozen soil interface , the generation, development and evolution for temperature fields of model pile-frozen soil interface was investigated with infrared thermal radiation imaging technique. The results show that there exists infrared radiation temperature rising phenomenon in pile-frozen soil interface during loading process. Before the pile slides, the low temperature areas in the thermal maps decrease both in density and dimension; and the temperature rising amplitude ?T as well as influencing width W at different depths D increase along with time; while ?T and W of the same time both decrease as the depth increases. After the pile has slid, the high temperature areas present a zonal distribution and display a trend of transfixion; in addition, the maximum temperature rising ?Tmax and the maximum area width influenced Wmax present a linear decreasing trend as the depth increases. The research results will provide reference for the applying of infrared radiation technique to the interface temperature field’s test of fabric-frozen soil in frozen regions.