Abstract:

The horseshoeshaped tunnels and end wall type tunnels are common in mountain areas. It’s necessary to study the suitability of tunnel temperature field calculation model using circular crosssection. The temperature fields of cold region horseshoeshaped tunnels in Northeast China are calculated by circular crosssection model using finite difference method of convectionconduction equations based on airliningsurrounding rock. The calculation results are compared with measured data. The results show that: 1) The finite difference calculation method by using circular crosssection model and considering effects of wind flow velocity and wind flow temperature, is easy and convenient; it can meet the construction requirements. 2) The wind flow velocity in tunnel and wind flow field at tunnel portal have a significant influence on tunnel temperature field. The temperature of secondary lining surface increases by 7.2 ℃ when wind flow temperature at tunnel portal increases by 10 ℃ . The temperature of secondary lining surface reduces by 6.6 ℃, 2.7 ℃, 1.5 ℃ and 0.9 ℃ when the wind flow velocity is 2 m/s, 3 m/s, 4 m/s and 5 m/s respectively.

Key words: horseshoeshaped tunnel, circular tunnel, temperature field, finite difference, field monitoring, wind flow temperature, wind flow velocity