连拱隧道扩大单侧壁导坑的三导洞开挖施工技术

Construction Technology of Three Guide Tunnel Excavation for Expanding Single Side Tunnel of Multi-Arch Tunnel

以某连拱隧道为实例,通过优化设计单侧壁导坑开挖断面,详细阐述了扩大单侧壁导坑的三导洞开挖施工方法及措施,从而改善了有限空间的作业环境,达到安全快速施工的目的,经济效益显著。

Taking a multi-arch tunnel as an example,through optimizing the excavation fracture surface of the single-side guide pit,the construction method and measures of the three-side guide tunnel for expanding the single-side guide pit are elaborated in detail,so as to improve the operating environment in the limited space,achieve the purpose of safe and rapid construction,and achieve significant economic benefits.