岩土力学2011，Vol.32Issue(1)：15-20,6.
软弱围岩隧道取消系统锚杆的现场试验研究
Field test research on elimination of systematic rock bolts in weak rock tunnel
摘要
Abstract
In weak rock tunnel, elimination of systematic rock bolts is advanced, and the primary support structure is the combination of steel arch, shotcrete, reinforcing mesh, feet-lock rock bolt and longitudinal link steel bar.This paper is based on Baojiashan tunnel.Two test sections are chosen and field test is carried out.With systematic rock bolts replaced by feet-lock rock bolts, two models of systematic rock bolts and non-systematic rock bolts are established and analyzed comparatively.The content of comparative tests includes: the clearance convergence of tunnel primary support, surrounding rock pressure, steel arch stress, shotcrete stress, axial force of rock bolt and longitudinal link steel bar stress.The result shows that the deformation of primary support in the two test sections tends stable and the structure is safe, which shows that the elimination of systematic rock bolts does not affect the security and stability of primary support; some rock bolts in the arch part are subjected to tension; and some are subjected to compression; but the force is minor, and the maximum tensile stress is only 11.8％ of ultimate strength of steel, so the support action of rock bolts in the arch part is not obvious; most feet-lock rock bolts are subjected to tension, and the maximum tensile stress is up to 191 MPa, so the feet-lock rock bolts play an important role in the support system.The elimination of systematic rock bolts will reduce construction process, lower engineering cost and shorten procedure cycle time, which is conductive to an early closure of surrounding rock to form a complete supporting structure.It will get a significant economic value and social benefits.关键词
隧道工程/软弱围岩/系统锚杆/锁脚锚杆/现场试验分类
交通工程引用本文复制引用
陈建勋,杨善胜,罗彦斌,王梦恕..软弱围岩隧道取消系统锚杆的现场试验研究[J].岩土力学,2011,32(1):15-20,6.基金项目
国家西部交通建设科技项目(No.200831800059). （No.200831800059）
