Research On Aerodynamic Effect Of High-speed Railway Tunnel And Its Impact On The Durability Of Lining Structure

High-speed railway tunnel project is a coupled system with the many factors including a random factor, uncertainties and unknown factors, the correlation between the factors are relatively strong, how to more coherently, clearly analyze this problem? Based on the researching results that have been analyzed and summarized, high-speed railway tunnel project is divided into three mutually coupled subsystems: Rock-Lining coupled subsystem, The gas in tunnel-Lining coupled subsystem, Orbit Foundation-Lining coupled subsystems, and The gas in tunnel-Lining coupled subsystem becomes the focus of studying.The one-dimensional piston wind theory and three-dimensional computational fluid simulation technology has been improved, application improved piston wind theory and the three-dimensional compressible flow SIMPLE method in FLUENT, the aerodynamic effects was simulated under high-speed train running in high speed railway tunnel. Compared the two methods, the three-dimensional compressible flow is selected. the pressure variation was calculated. Combined with Tecplot and MATLAB data analysis software, the high-speed railway tunnel cross section was analyzed in the whole process of change, especially when the train run through the section, the law of pressure variation. At the same time, the tunnel section of the pressure changes in the curves was made out.Based on the ANSYS parametric design language, combined with Monte Carlo method, concrete lining micromechanical model of high-speed railway tunnel was established with initial pore ratio that required. From the Mesomechanics point of view, application of ANSYS transient analysis, tunnel lining mechanical properties was calculated and analyzed during the whole process of high-speed train running in the tunnel. The stress variation of the whole process of high-speed train running was revealed in the high-speed train tunnel; The result show that: the function of compression wave and expansion wave can not be ignored for the high-speed railway tunnel lining fatigue damage.Based on the theory of deterioration in the stiffness, the fatigue damage crack variation was achieved on the high-speed railway tunnel. Based on the theory of deterioration in the stiffness, the mesodamage crack of concrete tunnel lining was numerically studied under aerodynamic fatigue loads, preliminary researching the fatigue damage variation of the high-speed railway tunnel lining mesodamage cracks. The results show that: the mechanical properties of the tunnel lining will gradually deteriorate under the aerodynamic fatigue repeated loading, especially in the middle and late service period, the impact is fatal to durability of the tunnel.The achievement of this paper are the basis for studying the stability and durability of high-speed railway tunnel in the aerodynamic fatigue loads determining, the tunnel mesomechanics model implementation, the studying of mesodamage variation and mechanical properties of lining structure.