摘要
针对贵阳地铁1号线某区间暗挖隧道上软下硬地层Ⅳ级围岩浅埋大断面工程特点,采用数值模拟计算、现场监测等手段,对区间隧道的Ⅳ级围岩进行优化分析,对比介绍了该施工条件下采用两台阶左右分步开挖法与竖撑加强两台阶分步开挖法对隧道稳定性的影响。实践表明,采用竖撑加强两台阶分步开挖法可有效控制区间围岩的变形,保证隧道施工安全,可为类似工程的设计、施工提供参考。
According to the characteristics of an interval mined excavation tunnel with Ⅳ-grade surrounding rock and largesection in upper-soft lower-hard strata in Guiyang Metro line 1, the paper optimized and analyzed the Ⅳ-grade surrounding rock of the interval tunnel by means of numerical simulation and field monitoring. Then, it introduced the influence of tunnel stability induced by two kinds of excavation methods, namely, left and right step-by-step excavation method and strengthening the vertical bracing. Practices showed that the latter method could effectively control range of surrounding rock deformation and ensure the safety of tunnel construction. It would provide reference for the design and construction of similar projects.
作者
赵利军
罗晋明
Zhao Lijun;Luo Jinming(CCCC Fourth Highway Engineering Co.Ltd.,Beijing 100022,China;China Railway Construction Kunlun Subway Investment Construction Management Co.Ltd.,Chengdu Sichuan 610000,China)
出处
《铁道建筑技术》
2018年第7期94-97,106,共5页
Railway Construction Technology
关键词
上软下硬
浅埋大断面
开挖方案
台阶法
加强竖撑
upper-soft lower-hard
shallow-buried large-section
excavation scheme
benching tunnelling method
strengthening the vertical bracing
