软质岩体双连拱隧道施工力学行为研究

在软质岩体环境下，针对大跨度双连拱隧道施工过程中衬砌、中隔墙及围岩等结构受力状态复杂、变化频繁等特点，以某大跨径双连拱隧道为实例，对隧道施工开挖全过程进行了数值模拟计算，系统分析了隧道围岩、中隔墙随隧道的开挖和支护过程的应力及塑性区的发展、变化规律，得到了采用双侧壁导洞法施工时，隧道施工力学行为的变化规律，对同类隧道设计及施工具有参考意义。

Mechanical Behavior of Double-Arch Tunnel Construction in Soft Surrounding Rock

Frequently wait for a characteristic specifically for structure such as putting a step un- derneath,being hit by mid-leading wall and the surronding rock in double arch of large-span tunnel con- struction process complicated, changing by force state. Based on projects of one double-arch tunnel during the double side drift construction. Tt simulates the excavation and supports procedure of construction,ana- lyzes the stress, plastic zone of surrounding rock and the mid-leading wall in every procedure of construc- tion. The study indicates the law of mechanics responds of the surronding rock and the mid-leading wall. Design and construction have reference significance to tunnel of the same kind.