高压旋喷桩在隧道洞顶地表和洞口基地加固中的应用

当前我国大力发展西南地区客运专线项目建设,该地区属云贵高原,山高坡陡,线路设计隧道所占比例较大,沪昆项目隧道所占比例接近70%。隧址区存在地质复杂、地形多变、隧道进出口多存在浅埋、偏压及软弱围岩、洞口基地软基等地质危害,利用高压旋喷桩施工技术对隧道洞口洞顶及基地进行加固,为安全进洞施工及明洞施工提供了安全保证,其中明洞段软基处理可以尽早防治线路工程下沉、冒泥、弹簧土等严重危害运营安全的工程病害。

Application of High Pressure Jet Grouting Pile in Tunnel Roof Surface and Base Strengthening

At present,our country strives to develop the passenger special line projects in the southwest area,where is situated the Yunnan-Guizhou Plateau,full of high mountains and steep slopes,for which reason tunnels account for a large proportion in the line design,almost 70% in our Yunnan-Guizhou project.In the tunneling site area,with complicated geology and varied land,there exist geological hazards at the tunnel entrance and exit zone,such as shallow burial,biased loads,weak rock and soft foundation etc.Using the technology of high pressure jet grouting pile,the roof and the foundation have been reinforced at the tunnel opening and the safety of tunnel construction and cut-and-cover construction is guaranteed,and especially,for the soft foundation in the cut-and-cover tunnel part,early preventive measures can be taken against sinking,mud pumping,springy soil and other engineering diseases that may seriously hazard the operation safety.