复杂地形地质条件下隧道进洞方案研究

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。

Tunnel Entrance Plan Selection in Complicated Terrain and Geology Area

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 ,Luotang 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 en-trance ,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 can provide guidance to similar projects .