Abstract
It is the key and difficult point to ensure the safety of tunnel construction by ventilation in high gas tunnel construction in high altitude and cold area. Taking ning-chan high gas tunnel as the research object, the ventilation of the tunnel is calculated, the ventilation parameters are optimized, the ventilation equipment is selected according to the calculation results, the location of the ventilation equipment is optimized, and the reasonable construction ventilation scheme is determined. The results show that through the design of the above ventilation scheme and the control of the site, it can not only ensure the ventilation demand of the super long and high gas tunnel construction in the high cold and high altitude area, but also ensure the tunnel construction in winter, and effectively save the construction ventilation cost.
Highlights
During tunnel construction, it is often necessary to cross areas with complicated geological conditions
In the construction process of tunnels passing through coal measure strata, it is inevitable to encounter poisonous and harmful gases such as gas and hydrogen sulfide, which seriously affect the safety during tunnel construction [1,2,3]
By analyzing the ventilation differences of high-altitude tunnels, the ventilation parameters of high-altitude tunnels during construction are calculated, the ventilation equipment is optimized, the reasonable construction ventilation scheme is determined, and engineering application is carried out for Ningchan Tunnel to verify the reliability of the ventilation scheme
Summary
It is often necessary to cross areas with complicated geological conditions. In the construction process of tunnels passing through coal measure strata, it is inevitable to encounter poisonous and harmful gases such as gas and hydrogen sulfide, which seriously affect the safety during tunnel construction [1,2,3]. Construction of high-gas extra-long tunnels in cold and high-altitude areas is unprecedented in China, and there is no experience to follow, so it is necessary to study the safe construction technology of tunnels in depth [4,5,6,7,8]. In high-gas tunnels, there are high-concentration gas, and highconcentration hydrogen sulfide, carbon monoxide and other toxic and harmful gases, so ventilation plays a crucial role. By analyzing the ventilation differences of high-altitude tunnels, the ventilation parameters of high-altitude tunnels during construction are calculated, the ventilation equipment is optimized, the reasonable construction ventilation scheme is determined, and engineering application is carried out for Ningchan Tunnel to verify the reliability of the ventilation scheme
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