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| Analysis of the Key Technology for Ground Temperature Test in Geothermal Investigation |
| LIU Zheng-Ping |
| China Railway First Survey and Design Institute Group Co. Ltd，Xi’an，Shanxi 710043，China |
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Abstract 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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Received: 06 January 2014
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2014, Vol. 31 
