浅埋砂质新黄土隧道双层小导管快速进洞施工技术

The double layer small duct quickly face excavation construction technology of shallow buried sandy loess tunnel

结合蒙华铁路银山3号隧道的工程概况,制定了双层小导管快速进洞施工方案,阐述了该方案的施工工艺流程及技术要点,并对隧道洞口段的沉降和收敛进行了监测,结果表明,该方案可减少洞口开挖、避免洞口扰动,实现安全快速进洞。

Combining with the engineering situation of Yinshan Mongolia and China Railway No. 3 tunnel, developed the double layer small duct quickly face excavation construction scheme, elaborated the construction process and technical key points of the scheme, and measured the settle-ment and convergence of tunnel ladit section, the results showed that the scheme could reduce the tunnel ladit excavation, to avoid the tunnel ladit disturbance, realized the safe and fast face excavation.