Research on Dynamic Heat Exchange in Subway Tunnel Surrounding Rock Considering Seasonal Effects
In order to deepen the understanding of the relationship between the thermal environment and surrounding rock of subway tunnels,the heat transfer of surrounding rock in each season was calculated through theoretical calculations as an intermittent heat source boundary to heat the surrounding rock,to simulate the dynamic changes of the thermal environment of the surrounding rock and the tunnel.As the thermal boundary condition of the numerical model,a three-dimensional temperature field model of the surrounding rock of the subway tunnel is established and compared with the measured data.The results indicate that the simulation results are in good agreement with the measured data,verifying the reliability of the model.The influence of heat exchangers on the long-term temperature field evolution of surrounding rock in subway tunnel sections was compared and analyzed using this model.Heat exchangers can effectively reduce the amplitude of temperature changes in the surrounding rock during summer and improve the heat storage capacity of the surrounding rock.In winter,it can store more cold energy in the surrounding rock and partially offset the heat generated by the interval tunnel in the next year,thereby improving the cold storage capacity of the surrounding rock.
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