Abstract More and more highway tunnels have been built in cold regions, and this paper addresses this topic. In order to analyze and calculate the temperature field, validate the necessity of the design of an insulating layer and confirm the economical efficiency and effectiveness of highway tunnels in cold regions, FEM Ansys was used to simulate and analyze these kinds of tunnels using the Xishan Tunnel as an example and taking into account the thermodynamic characteristics of permafrost in Northeast China. The calculated results of numerical simulation and measured data are compared to study 1) the temperature distribution of the surrounding rock after tunnel excavation and 2) the temperature variation process of the primary and secondary lining. The effect of heat insulation in the tunnel was also evaluated. Results showed that it is reasonable to put the insulating layer at the outside of the secondary lining, and it is not reasonable to use 40mm thick PU rigid polyurethane foam board as the heat insulating material for a large tunnel with a radius of 7m in the cold region of Northeast China. In order to make the design economic and rational, the insulating material can have a different thickness in the radial direction.
Abstract：
More and more highway tunnels have been built in cold regions, and this paper addresses this topic. In order to analyze and calculate the temperature field, validate the necessity of the design of an insulating layer and confirm the economical efficiency and effectiveness of highway tunnels in cold regions, FEM Ansys was used to simulate and analyze these kinds of tunnels using the Xishan Tunnel as an example and taking into account the thermodynamic characteristics of permafrost in Northeast China. The calculated results of numerical simulation and measured data are compared to study 1) the temperature distribution of the surrounding rock after tunnel excavation and 2) the temperature variation process of the primary and secondary lining. The effect of heat insulation in the tunnel was also evaluated. Results showed that it is reasonable to put the insulating layer at the outside of the secondary lining, and it is not reasonable to use 40mm thick PU rigid polyurethane foam board as the heat insulating material for a large tunnel with a radius of 7m in the cold region of Northeast China. In order to make the design economic and rational, the insulating material can have a different thickness in the radial direction.
HAO Fei,
SUN Quan-Sheng
.Research on the Temperature Fields and Insulating Layers of Highway Tunnels in a Cold Region[J] MODERN TUNNELLING TECHNOLOGY, 2012,V49(1): 39-43
2012, Vol. 49 