65438-0907, Zhan Tianyou, a civil engineer, personally planned and supervised the construction. The tunnel passes under the Great Wall through Badaling of Yanshan Mountains. The slope of the line outside the tunnel at the entrance end is 32.3455438+0 1 ‰, and the maximum slope of the line inside the tunnel is 2 1.57‰. The rock strata that the tunnel passes through are mainly hard gneiss, and some amphibole, shale and sandstone are weathered in a broken and muddy state.
Badaling Tunnel adopts "shaft excavation method", in which two teams cut in from both ends at the same time, one team cut in the middle of the mountain and cut to a certain position, and then divided into two teams to cut in at both ends, and the cut shaft formed a natural vent.
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Project characteristics
1, Beijing-Zhangjiakou Railway is a key supporting project for the 2022 Winter Olympics. The new Badaling tunnel continuously passes through Juyongguan, Shuiguan, Badaling Great Wall and other important scenic spots, and the ultra-shallow tunnel passes through the century-old Beijing-Zhangjiakou Railway and Shifosi Village. It is the longest tunnel in Beijing-Zhangjiakou Railway, with the strictest environmental protection requirements and the most tense construction period.
2. Badaling Great Wall Station is the largest underground railway station in mountainous areas in Asia, and it is also the underground railway station with the largest buried depth and lifting height in China. The station is divided into three underground structures from bottom to top: platform layer, entrance layer and exit layer (equipment layer), and a rock layer with a thickness of about 4.8m is left between the platform layer and the entrance and exit passages. There are 78 caves with different sizes and 88 cross sections in the station, which is the most complicated underground excavation group station in China.
Baidu encyclopedia-new Badaling tunnel
Baidu encyclopedia-Badaling tunnel