谈浅埋偏压软弱围岩冲沟段护拱法施工技术

Discussion on the construction technology of arch-protecting method at shallow-buried and unsymmetrical pressure surrounding rock gully section

以新建南广铁路小湘2号隧道为例,从施工准备、施作地表水沟、地表开挖防护、护拱施工等方面介绍了护拱法在浅埋偏压软弱围岩冲沟段的施工技术,实施效果表明:该方法有效保证了开挖面及初支稳定,取得了良好的经济效益。

Taking Xiaoxiang No. 2 tunnel of new Nan-Guang railway as an example, the paper introduces the construction technology of arch-protecting method at shallow-buried and unsymmetrical pressure surrounding rock gully section from aspects of construction preparation, construction surface ditch, surface excavation and protection and arch-protecting construction. The implementation results show that： the method effectively guarantees the stability of excavation surface and primary support, which achieves great economic benefits.