(1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；
3. China Railway 15th Bureau Group Co.，Ltd.，Luoyang，Henan 471013，China)
Abstract：In order to prevent freezing damage of tunnels in cold region，tunnel heating system using heat pump was introduced for the first time at Linchang tunnel in Inner Mongolia Autonomous Region of China. The rock-soil thermal response test was carried out to study the influence of the inlet temperature，flow rate and pipes distance on extracted heat and the influence of heat exchange on temperature field of surrounding rock and primary lining. It can be found that the extracted heat varies with the inlet temperature linearly and with flow rate exponentially. Although the extracted heat can be improved by increasing the flow rate，there is more resistance to fluid in heat exchange pipes，it will be uneconomical if the flow rate is great；it is suggested that the flow rate is no more than 0.75 m3/h. The affected depth of surrounding rock temperature is 75 cm when the heat exchange pipes distance is 100 cm，and is 100 cm when the heat exchange pips distance is 50 cm. The less the heat exchange pipes distance，the greater the affect depth of surrounding rock temperature and the temperature increment.
夏才初，张国柱，曹诗定，等. 寒区公路隧道防冻保暖技术及其发展趋势[C]// 2009年全国公路隧道学术会议. 兰州：[s.n.]，2009：13-19.(XIA Caichu，ZHANG Guozhu，CAO Shiding，et al. Antifreeze and warmth retention technology and development trend of road tunnel in frigid areas[C]// 2009 National Conference on Road Tunnel. Lanzhou：[s.n.]，2009：13-19.(in Chinese))
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2012, Vol. 31 
