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| Study on Distribution Law AND Observation of Ground Temperature in Spring along Xi’an Subway |
| REN Jian － xi1，LIU Jia － hui1，GAO Hu － yan2，YANG Zhi － guo3，ZHOU Xiao － yan4，GAO Ting － ting1 |
| 1． Xi'an University of Science and Technology，Xi'an，Shanxi 710054，China; 2． Xi'an City Metro Co． Ltd，Xi'an，Shanxi 710016，China; 3． China Railway First Survey and Design Institute Group Co． Ltd，Xi＇an，Shanxi 710043，China; 4． Shanxi Institute of Engineering Prospecting，Xi'an，Shanxi 710068，China |
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Abstract Research purposes: Xi'an is the first city to build the subway in loess in China，with a little information on the distribution law of the ground temperature in the subway buried depth range． The study was done on the long － term distribution law of ground temperature of the four typical geomorphic units along the Xi＇an subway to obtain the constant temperature strata position of the different geomorphic units and the distribution laws of the ground temperature in Spring for providing the reference to the air － conditioning design for the subway station and sectional tunnel．
Research conclusions: The analysis and study were done on the observation information of nine observation points along the Xi'an subway． The study results showed that the constant temperature strata position of the Zaohe first terrace was in the 10 meters under the ground surface with the temperature of 15 ℃，the constant temperature strata position of the loess ridge was in the 9 m under the ground surface with the temperature of 17 ～ 18 ℃，the constant temperature strata position of Weihe first terrace was in 10 meters under the ground surface with the temperature of 15． 5 ℃，and the constant temperature strata position of Weihe third terrace was in 9 meters under the ground surface with the temperature of the 16． 5 ℃．
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Received: 14 October 2011
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2012, Vol. 29 
