高拉拔荷载作用下浅埋隧道的变形规律及稳定性分析

Deformation Law and Stability Analysis of Shallow Buried Tunnel Under High Drawing Load

浅埋隧道地质具有复杂性条件,支护形式如果选取不当,容易发生塌方等事故。由于隧道受力分析具有较多不确定的因素,较难把握。对高拉拔荷载作用下浅埋隧道的变形规律及稳定性进行分析。结合浅埋隧道进行监控量测的资料,利用对数函数进行回归方程分析,以某市浅埋隧道作为研究的对象,构建隧道施工工程实际地形、地质的有限元数值模型,对隧道开挖施工力学模拟进行分析,得出浅埋隧施工围岩变形的规律。对隧道施工路径地层稳定性进行研究,对岩土、隧道施工地层的应力场、支护结构以及位移场进行计算。结果表明,围岩整体水平位移呈现非对称的分布,该研究对浅埋隧道施工与设计具有指导意义。

Shallow tunnel geology with complex conditions,support form if not properly selected,prone to landslides and other accidents.However,the analysis of tunnel stress has more uncertain factors and is more difficult to grasp.The deformation and stability of shallow tunnel under high pullout load are analyzed.Combined with the monitoring data of shallow tunnel,the logarithmic function is used for regression analysis.Taking the shallow tunnel in a certain city as the object of study,a finite element numerical model considering the actual topography and geology of the tunnel construction is constructed.The tunnel excavation mechanics Simulation analysis,draw the law of shallow tunnel construction surrounding rock deformation.The stability of the tunnel formation is studied by the construction path,and the stress field,supporting structure and displacement field of rock and soil and tunnel construction stratum are calculated.The results show that the overall horizontal displacement of surrounding rock presents an asymmetrical distribution.This study is instructive for the construction and design of shallow tunnels.