摘要
九绵高速桂溪隧道区内裂隙带或破碎带(L2、L3及L4)发育,裂隙带或破碎带岩体稳定性非常差,成洞质量差,存在严重的安全隐患。通过采用超前锚杆+超前小导管+预注浆联合的支护技术,可很好地适应不同地质条件,实现对隧道围岩的提前加固,并形成一个稳定的围岩结构体系,促使隧道施工的各道工序都能高效、安全、有序地开展,可为类似工程施工提供一定的经验。
In Guixi tunnel area of Jiujiang-Mianyang Expressway, fracture zones(L2, L3 and L4) are developed. The rock mass in these zones is not stable and the quality of tunnel formation is poor which lead to serious potential safety hazards. By adopting the combined support technology of advanced anchor bolt+advanced small conduit+pre-grouting, it can well adapt to different geological conditions, realize the advanced reinforcement of tunnel surrounding rock, and form a stable surrounding rock structure system, which can promote the efficient, safe and orderly development of all procedures of tunnel construction, and can provide some experience for the construction of similar engineering.
作者
段玉武
DUAN Yuwu(China Railway 18th Bureau Group 5th Engineering Co.,Ltd.,Tianjin 300459,China)
出处
《国防交通工程与技术》
2023年第1期58-60,40,共4页
Traffic Engineering and Technology for National Defence
基金
四川省基础设施重点科技计划项目(2021D39)。
关键词
围岩破碎
隧道
超前支护
超前小导管
深孔预注浆
超前锚杆
surrounding rock fracture zone
tunnel
advanced support
advanced small conduit
deep hole pre-grouting
advanced anchor bolt
