摘要
石峡隧道ZK31+306-ZK31+336处穿越F7断裂破碎带,掌子面围岩整体为熔结角砾凝灰岩。本文针对围岩条件差、开挖断面大特点提出采用集钻孔、安装、注浆和支护四位一体的自进式小管棚超前支护,该超前支护有效提高了塑性区围岩的承载能力,隧道开挖后围岩变形控制显著,此外还提高了隧道施工工效。
The Shixia tunnel ZK31+306-ZK31+336 section crosses the F7 fracture zone,and the surrounding rock of the tunnel face is fused breccia tuff.This article proposed that self-propelled little shed-pipe advance support with drilling,installing,grouting and supporting can overcome the features of poor surrounding rock condition and large excavation.This advance support effectivelyimprovesbearing capacity of plastic zone of surrounding rock,and the deformation control of surrounding rock after tunnel excavation is significant,which also improves the construction efficiency of tunnel.
作者
李继光
Li Jiguang(China Railway 20th Bureau Group Corporation No.2 Engineering Company,Xi’an,710016)
出处
《石家庄铁路职业技术学院学报》
2020年第2期23-28,共6页
Journal of Shijiazhuang Institute of Railway Technology
关键词
软弱围岩
大断面
隧道
自进式管棚
超前支护
soft rock
larger section
tunnel
self-propelled pipe shed
advance support
