摘要
在大粒径低孔隙砂卵石土层中进行暗挖隧道施工应以不扰动土层为原则,慎用小导管超前支护措施;坚持"短挖短支"施工原则,及时封闭成环;合理设置下台阶的长度和坡度;及时进行背后回填注浆。
No disturbed soil layer is the principle during subsurface excavation tunnel construction in the sand-cobble layer with large grain size and lower porosity. The application of small conduit pre support measure should be careful; persist in the principle of ＂short excavate and short support＂, close down in time and forming annulus; setting the length of downward steps and slop gradient reasonable; rear backfill grouting in time.
出处
《工程质量》
2012年第7期47-50,共4页
Construction Quality
关键词
砂卵石
暗挖隧道:施工技术
sand-cobble
subsurface excavation tunnel
construction technology
