大跨径燕尾式隧道单线断面变双线加宽断面开挖施工技术研究

Study on Construction Technology of Double Line Widening Section Excavation for Single Span Section of Long Span Swallow Tailed Tunnel

结合衢宁铁路大跨径燕尾式隧道的施工,从开挖方法、支护方法、沉降控制等方面的质量控制,介绍由单线断面隧道变为双线加宽断面隧道开挖的施工工艺及施工技术,为类似工程提供借鉴。

Combining with the construction of large-span swallow-tail tunnel of Quning Railway, this article introduces the construction technology of changing single-line cross-section tunnel into double-line widened cross-section tunnel from excavation method, support method, settlement control, and other aspects, which could provide a reference for similar projects.