摘要
新七道梁隧道是甘肃省在建的开挖断面最大的公路隧道,地质条件复杂。对隧道围岩收敛测量数据进行曲线分析,并从岩体质量、断层破碎带、不连续面空间位置、地下水、隧道埋深等方面分析它们对围岩变形的影响程度。结果显示:1)岩体质量与隧道开挖后围岩的变形成反比;2)断层破碎带区段围岩变形量大、持续时间长;3)隧道开挖与不连续面成逆倾向、大倾角时,围岩变形小;4)地下水引起围岩稳定性下降,变形增大;5)隧道埋深也是影响围岩变形的因素。
Xinqidaoliang Tunnel under construction is the largest cross-section road tunnel with complicated geological conditions in Gansu province. Based on the monitoring data of surrounding rock deformation in the tunnel, the geological factors including the rock quality, the fault and crushed zone, groundwater, and depth and so on are analyzed in this paper. Results show as follows: 1)The worse the rock quality is, the larger deformation surrounding rock is. 2)The deformation is large and lasts for a long time in the fault and crushed zone. 3)The deformation is small if the tunnel is against the direction of uncontinuous plane. 4)The groundwater gives rise to reduction of stability and large deformation of surrounding rock. 5) The depth of the tunnel also affects the deformation of surrounding rock.
出处
《隧道建设》
2007年第S2期53-59,共7页
Tunnel Construction
关键词
隧道
变形
地质因素
tunnel
deformation
geological factors
