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| Research on the Temperature Field and the Buried Deptli of Drains for Tunnels in Cold Region |
| SUN Ke - guo1，YANG Peng2，QIU Wen - ge1，SONG Xian - hui3，LIN Li - bin4，XU Wei - ping1 |
| (1. Key Laboratory of Transportation Tunnel Engineering， Ministry of Education， Southwest Jiaotong University， Chengdu，Sichuan 610031 China; 2. China Railway Eryuan Engineering Group Co. Ltd， Chengdu，Sichuan 610031， China; 3. Liaoning Provincial Highway Construction Bureau， Shenyang， Liaoning 110111，China; 4. Liaoning Provincial Communication Planning & Design Institute，Shenyang，Liaoning 110111，China) |
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Abstract Abstract: Research purposes: Freezing damage often happens in cold region tunnels. Waterproof and drainage measures are the important component to prevent freezing damage，for which the reasonable buried depth of drains is the most important factor. The depth is controlled by the temperature field， and influenced by the meteorological environment，geological environment and engineering measures. Since less research has been focused on the tunnel temperature field and buried depth of drains，this paper will deeply evaluate this problem based on practical project. The results can provide guidelines for preventing freezing damage. Research conclusions: Utilizing theoretical analysis，numerical experiment， and on - site test measures， and based upon the heat transfer theory of fluid - solid coupling , the temperature field and the buried depth have been thoroughly studied. Several conclusions have been obtained:(1 ) The time and space distribution rules of the temperature field for cold region tunnels have been reached. The relationship between the regional frozen depth and the buried depth of drains has been analyzed. (2) For this problem, thermal diffusivity is the first grade index and the density，thermal conductivity , specific heat are second grade ones. ( 3 ) The formula for the buried depth of drains has been obtained. This formula is based on the average temperature of the coldest month and considered the difference of the thermal diffusion between the surface soil and the surrounding rock of tunnel. Utilizing this formula，the design for drains in cold region can be realized more reasonably. (4)Through analyzing the monitored data from a highway tunnel in nortlieast China， the validity of tliis formula has been verified，which can provide reference and guidance for subsequent similar tunnels.
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Received: 23 May 2016
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2017, Vol. 34 
