寒区隧道保温设防长度工程实践与研究进展综述
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Review on engineering practice and research progress on thermal insulation length of tunnels in cold regions
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图4. 寒区隧道与空气相互作用及保温设防示意图 |
Fig. 4. Schematic diagram of interaction between air and tunnel structures in cold regions and determination of thermal insulation length: seasonally frozen ground region (a) and permafrost region (b) (Tmax and Tmin represent annual maximum temperature and annual minimum temperature at the entrance of tunnel, respectively; T0 represents thermal insulation standard temperature; x0 represents thermal insulation length) |
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