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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。
In soft rock environment, considering the characteristics of complicated and frequent changes of stress, such as lining, mid-wall and surrounding rock during the construction of long-span double-arch tunnel, taking a large span double-arch tunnel as an example, The whole process of tunnel construction and excavation was simulated by numerical simulation. The development and variation regularity of stress and plastic zone of tunnel surrounding rock and middle wall with tunnel excavation and support were systematically analyzed. During the construction of tunnel, the law of variation of tunnel construction mechanics behavior has reference meaning to the design and construction of similar tunnels.