陕西乾陵台地球动力学观测硐室的红外热成像

Infrared Thermography Imaging of Geodynamic Observatory Tunnel at Qianling Station, Shaanxi Province

以陕西乾陵台为例,采用红外热像仪对引硐、NS和EW向硐室衬砌的温度进行测量和热成像。结果表明:引硐为高温段,随着不断深入,温度以近线性的趋势从20.7℃下降至14.8℃;NS向硐室温度比EW向略高,平均分别为13.5℃和13.1℃,但二者整体变化皆稳定均匀。各区段内温度存在小幅的波动现象,某些局部区域个别测点的温度较离散;而同一测点处衬砌和空气的温度并不一致,存在较大差异。硐室E端处的热像图显示顶拱的温度普遍高于侧壁。

Taking the Shaanxi Qianling Observatory as an example,we systematically detect and image the temperature in lining for the front,NS,and EW parts of the tunnel using the powerful infrared thermal camera. The results show that lining temperature in the front is much higher,varying from 20.7 ℃ to 14.8 ℃,and exhibits a linearly decrease with an increase in distance from the entrance. The lining temperature in the NS part is slightly higher than the EW part,the mean temperatures are approximately 13.5 ℃ and 13.1 ℃ respectively,but each of which is basically uniform and stable. Generally,slight temperature fluctuations widely exist in three main parts of tunnel,the dispersions are larger at a few individual points among them. Furthermore,temperatures in lining and air are significantly discrepant at the same point,this means the difference is drastic. Additionally,infrared thermograms of the eastern end of tunnel show that the temperature in ceiling is clearly larger than that in the sidewalls.