海家沟隧道施工技术

Construction Technique of Haijiagou Tunnel

】海家沟隧道地下水丰富，地质条件差，进口１２０ｍ为砂粘土和新黄土，出口３００ｍ为大断层，洞身为泥岩。本文以实例说明在地下水丰富的软弱围岩施工中，如何确保施工安全和结构稳定，加快施工速度，提高经济效益。

The ground water of Haijiagou tunnel is abundant.The geological condition of the tunnel is very poor.It is about 120m sandy clay and new loess at the tunnel entrance,and there is a 300 meter wide fault at the exit.The ground of the tunnel body is mud stone.This paper tries to demonstrate how to ensure the safety of construction and the stability of tunnel structure,to accelerate the speed of construction and to enhance economic benefit in the condition of weak surrounding rock and abundant ground water.