Experimental Study on Freezing Front Model of Alpine Tunnel under Wind Field

In order to study the freezing front characteristics of alpine tunnels under condition wind flow field and relying on Osaka Mountain tunnel in Qinghai Province, physical model test an was built. By using Surfer software combined with laboratory data, radial longitudinal temperature variation trends were obtained, overall vector graph simulated; evolutionary laws a airflow conditions systematically analyzed, governing equations proposed. The results show that: With decrease air temperature, thermonuclear area surrounding rock gradually shrinks, frozen at bottom arch increases, top expands interior mountain. influence degree ventilation distribution is obvious, greater speed, degree. particular, fluctuation range more extensive ventilation. distance inverted largest, expansion wall foot obviously higher than that vault; different positions shows parabolic attenuation increase depth, trend eases becomes stable disappears; three regions quadratic parabola can predict specific depths tunnel.