超浅埋暗挖隧道施工技术

摘要

文章介绍了在确保上方高速公路地面交通正常通行的情况下,超宽断面、埋深仅为0.5～2.5m的超浅埋平顶直墙下穿隧道工程采用管棚超前支护,结合小导管注浆加固地层、多导洞施工方案和微台阶开挖法来达到控制地表沉降和保证施工安全的“浅埋暗挖法”施工技术.%The paper introduces the flat roof and straight wall tunnels under-passing express way with super-shallow overburdens of 0.5~2.5m constructed by mining method. Advance pipe-roofing support, small pipe grouting, multi-headings and short-bench excavation were taken in the construction to control surface settlements of pavement and to ensure the normal traffic of the expressway.