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国道227线(宁张公路)大坂山隧道进口海拔3792.75米,以2.8％的纵坡降至出口为3749.91米,为目前我国乃至欧亚大陆海拔最高的道路隧道。地质情况复杂,隧道从多年冻土与季节冻土临界线穿过;围岩软弱破碎,在隧道全长1530米中,二类围岩560米,三类围岩380米,占61.5％;地下水丰富,从防寒泄水洞排出的水量看,暖季达20m~3/小时,寒季10m~3/小时,冬令期长达218天。在这样的条件下修建公路隧道,工程艰巨,且无成功经验借鉴,其中防冻害是大坂山隧道成败的关键。为此在设计上尽可能地采
State Road 227 (Ning Zhang Highway) Osaka Hills tunnel entrance 3792.75 meters above sea level, with 2.8% of the longitudinal slope down to 3749.91 meters for the exit, as China and even Eurasia at the highest elevation of the road tunnel. The geological conditions are complicated. The tunnel passes through the critical permafrost and seasonal frozen soils. The surrounding rock is weak and broken. Among the total length of 1530 meters, the second type is about 560 meters and the third is about 380 meters, accounting for 61.5% of the total. The groundwater Abundant, the amount of water discharged from the cold water drainage hole can be seen in the warm season of 20m ~ 3 / hour, the cold season of 10m ~ 3 / hour, and the winter season of 218 days. Under such conditions, the construction of highway tunnels is arduous and there is no successful experience to learn from. The frost damage is the key to the success or failure of the Osaka Mountain Tunnel. To this end in the design as mining