研究目的:拉日铁路在雅鲁藏布江峡谷区色麦至仁布段，近垂直地通过那曲-羊八井-尼木水热活动带，在铁路隧道的地热勘察中，采用钻孔内地温测试的方法对地温场进行评价，并对其地温测试关键技术进行总结和研究。
研究结论:(t)拉日铁路地温测试的关键技术主要包括:地温侧试元件选择、钻孔及孔内结构、测试时间以及数据处理;(2)地温元件选择热敏电阻，其精度高，操作简单，反复利用性强;(3)钻孔施工要注意孔斜控制，孔内要安装测温管以便地温测绳反复利用，地温测试时间在终孔后30 d为宜;(4)地温测试数据的处理主要包括:确定恒温带深度、大地热流值、隧道洞身温度推算等;(S)本文的研究成果可以为同类地区地热地温测试工作提供依据和借鉴，对地热勘察工作及地热研究有-定的参考意义。
Research purposes: In the YarluZangbujiang Canyon, the Semai-Renbu section of Lhasa-Rikaze railway goes near vertically across the hydrothermal active belt of Naqu-Yangbajing-Nimu. In the engineering geologic investigation for railway tunnel of geothermal region, we use the ground-temperature test method in drilling-hole to evaluate the geothermal conditions. This paper summarizes and studies on its geothermal test' s key technology.
Research conclusions(1)In the geologic investigation of Lhasa-Rikaze railway, the key technology of ground temperature test mainly includes: sensor for ground-temperature measuring, drilling- hole，the hole structure，test time and data processing. (2)It is suitable that the thermostat was choose as the sensor for ground-temperature test, with high precision，simple operation，well repeated use.(3)Pay attention to the hole deviation control in the process of drilling. Put the temperature tube in the drilling-hole , so that the temperature measuring cable can be repeated used. The temperature test time should be 30 days after the drilling. ( 4 ) The data processing about ground temperature mainly includes: determining depth of constant temperature layer, calculating the ground heat flux，forecasting the tunnel temperature，etc. ( 5)The results of this study can provide the basis and reference for geothermal ground temperature measuring of similar region, have certain reference significance to the geothermal investigation and geothermal research.
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