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京九线是国家重点建设工程,时间紧、难度大,有一系列的设计和施工难题。铁十四局四处承担施工任务的岐岭隧道是总公司所辖区段内的难点工程之一,该隧道进口段覆盖层薄,地面和地下水发育,地层为极严重风化花岗岩,在雨季呈软塑状,按围岩分类属Ⅰ类围岩中最坏情况,洞口坡脚开挖立即引起山坡牵引性塌滑,地表产生裂缝、错台,按目前国内常规施工方法,
Beijing-Kowloon Line is a national key construction project, time tight, difficult, with a series of design and construction problems. Railway Fourteen Board four construction tasks undertaken by the Qiling tunnel is headquartered within the jurisdiction of one of the difficulties in the project, the tunnel entrance section cover thin, ground and groundwater development, the formation of very serious weathered granite, was soft plastic in the rainy season According to the classification of surrounding rock belongs to the worst case of type Ⅰ surrounding rock, the excavation of the foot of slope at the mouth of the hole immediately causes the traction and collapse of hillside, the cracks and the fault on the ground surface. According to the conventional domestic construction methods,