Research purposes: Based on the 2022 Winter Olympics Games significant traffic security projects Jinjiazhuang extra-long spiral tunnel, by combining field measurement, theoretical analysis and COMSOL numerical simulation, the random fracture model in the surrounding rock area of the tunnel was established to study the effects of heat transfer coefficient, initial temperature of surrounding rock, thermal conductivity coefficient and specific heat capacity on temperature field, and establish the mathematical relation between the initial temperature of surrounding rock and the designed thickness of insulation layer.
Research conclusions: (1)The influence of thermal conductivity and initial temperature on radial temperature field is greater than that of heat transfer coefficient and specific heat capacity, but the temperature variation law can all be represented by the Asymptotic1 model. The influence of thermal conductivity on the radial temperature field is bounded by 0.71 m from the vault. (2) The vault temperature and average temperature of the contact surface between lining and surrounding rock decrease with the increase of heat transfer coefficient and increase with the increase of thermal conductivity coefficient, initial temperature and specific heat capacity of surrounding rock.(3)The freezing depth increases with the increase of thermal conductivity and decreases with the increase of initial temperature. The variation of the insulation thickness with the initial temperature can be represented by the ExpDec1 model. (4) The research conclusion can provide reference for the design, construction, operation and maintenance of the tunnel in the cold area.
Key words
tunnel in cold region /
random crack /
heat transfer coefficient /
surrounding rock conditions /
thermal insulation layer
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References
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Footnotes
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