复杂地形地质条件下隧道进洞方案研究

Tunnel Entrance Plan Selection in Complicated Terrain and Geology Area

由于特殊地形及不良地质条件的影响,隧道进洞方案各不相同。结合武罐高速公路洛塘至罐子沟(甘川界)段工程实际,针对洞口复杂的地形、地质条件,基于安全、环保设计理念,详细介绍了松散坡积体、顺层岩体、陡峻狭窄地形条件下的进洞方案和"零开挖"的洞口设计,采用了斜交、台阶式套拱结构等创新性的设计。提出的设计优化方案,解决了相应的工程难题,对类似工程有一定的借鉴、指导意义。

Because of the special terrain and complicated geological conditions, the selection of tunnel entrance plan is a complicated problem. This paper took the real world project of Wudu - Guanzigou highway, Luotailg to Guanzigou （The boundary of Gansu and Sichuan） section as an example. The complicated terrain, geological condition was considered and analyzed, based on the concepts of safety, environmental friendly, this paper proposed a suitable plan for tunnel entrance, which include loosed posit, bedding rock and steep-narrow conditions, the plan does not need any excavation at all, skew and step cover-arch structure design was adopted. The paper carl provide guidance to similar proiects.