关键词: 衬砌结构;水工隧洞;对流-导热;热力耦合;布伦口水电站;寒区;

Abstract: The temperature variation of hydraulic tunnels in cold area under ventilated condition will affect the mechanical properties of the lining structure, thus affecting the safe operation of hydraulic tunnels.Based on the field monitoring data of the hydraulic tunnel of Xinjiang Bulunkou Hydropower Station, the thermal-mechanical coupling characteristics of the lining structure of different distances from the entrance subjected to different winds of temperatures and wind speeds at the tunnel entrance were analyzed by using the finite element method.The results showed that the lining temperature at the tunnel entrance was lower than that at the deeper tunnel under different wind temperatures.The variation range of the lining temperature at the tunnel entrance was greater than that at the deeper part of the tunnel.With the increase of ventilated time, the compressive stress of the primary lining and the secondary lining decreased first and then increased, and the maximum compressive stress was located at the arch waist.The maximum temperature difference between the primary lining and the secondary lining at different wind speeds was 8.40 ℃.With the increase of the axial and radial distance of the hydraulic tunnel, the temperature gradually increased, where the influence of wind speed and temperature gradually decreased.The maximum temperature tensile stress was located at the arch waist, which was 0.12 MPa for the primary lining and 0.32 MPa for the secondary lining.Under different wind temperature and wind speed, the displacement of primary lining and secondary lining all showed horizontal shrinkage and vertical heave.The research results can provide theoretical reference for the optimal design of lining of hydraulic tunnels in cold region.

Key words: lining structure; hydraulic tunnel; convection-heat conduction; thermal-mechanical coupling; Bulunkou Hydropower Station; cold region;