摘要
针对高地温环境下的水工隧洞,从平面空间角度出发,对不同方位路径、围岩深度、温度变化、地层深度、侧压力系数影响下的隧洞围岩应力变形特征进行研究。结果表明:隧洞开挖面处径向应力为零,离开挖面越远围岩径向应力就越大,隧洞开挖后围岩位移最大值位于拱顶处。围岩深部温度变化会对开挖面位移产生较大影响,对隧洞拱顶及洞底位移的影响尤其显著。隧洞所处地层深度对隧洞侧墙环向应力的影响明显,隧洞埋深越深,侧墙环向应力越大;隧洞拱顶位移最大,洞底处次之,侧墙中部最小。不同侧压力系数下,隧洞开挖面环向应力在侧墙处最大,而位移在侧墙处达到最小,隧洞开挖面环向应力关于隧洞水平轴线呈上下对称。
In view of the hydraulic tunnel under high temperature environment,the stress and deformation characteristics of tunnel surrounding rock under the influence of different azimuth paths,depth of surrounding rock,temperature change,stratum depth and lateral pressure coefficient are studied from the perspective of plane space.The results show that the radial stress at the excavation surface of the tunnel is zero;the greater is the radial stress of the surrounding rock,the farther away from the excavation surface,and the maximum displacement of surrounding rock after the tunnel excavation is observed at the arch top.The temperature change of the deep surrounding rock significantly impacts the displacement of the excavation surface,especially on the displacement of the tunnel arch and the bottom.The influence of the stratum depth on the circumferential stress of the side wall is obvious.The deeper the tunnel is buried,the greater is the circumferential stress of the side wall;the maximum displacement occurs at the tunnel vault,the second largest displacement is observed at the bottom of the tunnel,and the minimum displacement is observed at the middle of the side wall.Under different lateral pressure coefficients,the circumferential stress of the excavation surface is the maximum at the side wall,while the displacement is the minimum.The circumferential stress of the tunnel excavation surface is symmetrically distributed about the horizontal axis of the tunnel.
作者
后雄斌
HOU Xiongbin(Xinjiang Water Conservancy and Hydropower Survey and Design Institute, Urumqi 830000,China)
出处
《西北水电》
2021年第2期73-78,共6页
Northwest Hydropower
关键词
高地温
水工隧洞
围岩
应力变形
high ground temperature
hydraulic tunnel
surrounding rock
stress deformation
