摘要
地质顺层偏压隧道稳定性与非对称控制技术一直是工程界和学术界关注的关键科学问题.依托武汉至十堰高速铁路大坡岭隧道,采用现场岩体结构面产状现场量测和离散元数值模拟相结合的方法,研究地质顺层偏压隧道力学响应、非连续变形特征,优化锚杆支护设计参数.研究表明:各层岩体均相当于独立的处于受弯剪状态悬臂梁,结构面产生易剪切滑移或张开;锚杆支护可以提高节理面法向刚度和剪切刚度,从而增强节理面的抗变形能力和抗剪切强度;通过数值模拟优化,提出非对称锚杆支护方案,可节约钢筋50%以上,锚杆打设方向尽量与节理成大角度相交.研究成果可为今后类似地质顺层偏压隧道稳定性评价和锚杆支护优化提供参考.
The stability of tunnels in geologically inclined bedding strata and nonsymmetrical support have always been the critical scientific issues,concerned by scientists in engineering and academic fields.With the Dapoling Tunnel in WuhanShiyan High-speed Railway Project as an example,the details of joints were measured at field.Then,discrete element numerical modelling was employed to investigate the mechanical response and discontinuous deformation of rock masses around tunneling in geologically inclined bedding strata.The research result presents that each layer of rock bears loading,similar to cantilever beam.The slippage and opening readily occurs along the joints.Rockbolts can significantly improve the normal and shear stiffness,in order to strength the anti-deformation and anti-shearing stability.Handling the numerical modelling facilitates the nonsymmetrical rockbolt scheme.The angle between the strike of rockbolts and the joint should be as large as possible.The optimized parameters of rockbolts could save steel by more than 50%.This study provides a reference for similar geological tunnel and underground engineering in inclined bedding strata.
作者
杨晓辉
YANG Xiaohui(China Railway 12^th Bureau Group 3^rd Engineering Co.Ltd.,Taiyuan Shanxi 030024,China)
出处
《铁道建筑技术》
2020年第9期65-69,79,共6页
Railway Construction Technology
基金
中铁十二局集团有限公司科技研发项目(公司科[2018]26号)。
关键词
顺层偏压
铁路隧道
非连续变形
锚杆
参数优化
inclined bedding
railway tunnel
discontinuous deformation
rockbolt
parameter optimization
