Study on the influence of canyon wind on frost resistance length of tunnel in cold regions
As a specific product of alpine canyon area and plateau mountain area,canyon wind is the key factor affecting the frost resistance length of tunnel in alpine mountain area.Therefore,it is of great research value and guiding significance to study the frost resistance length of tunnel in cold regions under the action of canyon wind for the early prevention and effective treatment of tunnel diseases in cold regions.In this paper,the comprehen-sive research methods such as field measurement,numerical simulation and factor design are used to carry out the research on the variation law of frost resistance length of tunnel in cold regions and the corresponding mecha-nism analysis around the three control indexes of canyon inclination,the angle between the downwind direction of canyon wind and the axis of tunnel and the relative height of tunnel entrance.Firstly,this paper relies on the national key tunnel project to carry out on-site monitoring work.Taking 0℃ as the critical temperature of tunnel frost damage,it is concluded that the measured frost-resistant fortification length of the tunnel is 200～300 m;Secondly,based on the control indexes of the actual tunnel conditions in the alpine canyon area,the numerical model of the frost resistance length of the tunnel in cold regions under the canyon wind is established and the nu-merical simulation test is carried out.The numerical simulation result is 237.78 m,which is highly consistent with the measured frost resistance length of the tunnel.Finally,through the analysis of the numerical experiment results,it can be concluded that the frost resistance length of the tunnel in cold regions under the action of the canyon wind is affected by the coupling of multiple factors,among which the canyon inclination angle has the greatest influence on the frost resistance length of the tunnel.The interaction between the angle between the downwind direction of the canyon wind and the axis of the tunnel and the relative height of the tunnel has the least influence,and the influence mechanism of the frost resistance length of the tunnel under the condition of the canyon wind is deeply explored.This study has important significance and reference value for the calculation of frost-resistant fortification length of tunnels in cold regions under canyon wind conditions.
canyon windtunnel in cold regionsfrost resistance lengthnumerical experimentsfactor designing method
万方数据
维普
