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《Chinese Journal of Underground Space and Engineering》 2012-01
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Monitoring and Analysis of Heat Transfer through Surrounding Rocks of Subway Tunnel

Li Xiaozhao1,Xiong Zhiyong1,Qiao Hengjun1,Ma Juan1,Zhang Xuehua2,Du Maojin2(NJU-ECE Institute for Underground Space and Geo-environment,School of Earth Sciences and Engineering,Nanjing University,Nanjing 210093,China;2.Nanjing Metro Company Ltd,Nanjing 210012,China)  
Subway tunnels are almost isolated from the outside air.Air conditioning system is usually needed to extract the large amount of heats during the operation of subway.The estimation of heat transfer through surrounding rocks is a basis for the determination of heat load of air conditioning system and the control of thermal environment.However,the estimation and prediction of heat transfer is difficult and not satisfactory so far.Therefore,some monitoring instruments were installed in a section of the tunnel of Nanjing subway line 1.The air temperature in tunnel,tunnel wall surface temperature and heat flow have been monitored.The monitoring data show that the heat generated by running trains is the upmost factor for the change of tunnel surface temperature and heat flow through surrounding rocks.The surface temperature of subway tunnel and heat flow through surrounding rocks can be affected significantly by dramatic change of ground temperature.Heat flow through surrounding rocks showed a clear cyclical change within a day.Finally,on the basis of the actual operation parameters,the total heat generated by a train was calculated,and then the ratio of the heat transfer through surrounding rocks of the monitoring tunnel has also been estimated.
【Fund】: 国家自然科学基金资助项目(40872171);; 国家国际科技合作计划资助项目(2009DFA2680)
【CateGory Index】: U456.31
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