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Mechanical Analysis on Construction Process of Large-span Double-arch Tunnel Through Cracked Rocks
Author(s): 
Pages: 544-548,554
Year: Issue:  3
Journal: Underground Space

Keyword:  大跨度双连拱隧道 破碎山体 三导洞法 力学分析;
Abstract: 九华山隧道采用大跨度双连拱穿过两个破碎带。施工方法为三导洞加横通道法,并破除了常规进尺限制。为了确保隧道的施工安全和工期,对施工工序进行了力学分析,并通过施工过程监测对计算数据修正。隧道变形最明显位置在拱顶、拱底;应力比较敏感的位置出现在中墙与左右洞拱脚的交点、拱顶及拱腰,围岩大部分区域是受压的,拱底一小部分出现了局部拉应力。结论指导了施工方案的调整,为同类工程施工提供了重要的借鉴意义。
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