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8月31日,在14项新工装、工艺助力下,京张高铁南口隧道出口成功掘进500 m,标志着南口隧道施工正式提速,进入大干阶段。南口隧道地处北京市昌平区南口镇正北侧,总体位于老京张铁路东侧,走向与之基本相同。该隧道全长3 032 m,穿越地势陡峭的军都山,设计时速250 km,最大埋深340 m,为单洞双线型隧道,现已探明IV级围岩130延长米、V级围岩107延长米,部分区段地下水丰富,地质环境较为复杂,施工难度较大。
On August 31, with the aid of 14 new tooling and technology, the successful tunneling of 500m at the exit of Beijing-Zhangjiakou-Nankou Tunnel marked the official speed-up of the construction of the south exit tunnel and entered the major phase. Nankou Tunnel is located in Changping District, Beijing’s north side of the town is located south of the old Beijing-Zhangzhou Railway to the east and basically the same. The tunnel, with a total length of 3,032 m, passes through the steep terrain of Jundu Mountain with a designed speed of 250 km / h and a maximum depth of 340 m. It is a single-tunnel two-lane tunnel. 107 meters of rock extension, some sections of rich groundwater, geological environment is more complex, construction more difficult.