浅埋隧道围岩受力计算分析及隧道衬砌支护研究

浅埋段软弱围岩自稳能力较差,隧道开挖时受到扰动较显著,当支护没有充分保障时,浅埋段发生延伸至地表塌陷灾害事故的可能性远高于深埋段。文章基于Hoek-Brown破坏准则对围岩压力的浅埋段有效影响范围进行了推导,得到了浅埋段围岩压力随位置变化的变化规律,本次研究的评价方法在隧道施工中具有较强的可靠性与适应性,能够为其他砂泥岩隧道工程施工设计提供相应指导,能确保隧道建设与公路运营安全。

Analysis of Surrounding Rock Stress Calculation of Shallow Buried Tunnel and Research on Tunnel Lining Support

The self-stabilizing capacity of weak surrounding rock is poor in the shallow buried section,and the disturbance is significant during tunnel excavation.The possibility of collapse disaster accidents extending to surface in shallow buried section is much higher than that in the deep buried section when the support is not fully guaranteed.The effective influence scope on the surrounding rock pressure shallow buried section is deduced based on Hoek-Brown failure criterion.The change law of surrounding rock pressure in the shallow buried section is obtained.The evaluation method in the research has strong reliability and adaptability in tunnel construction.It is able to provide guidance for construction design in other sand-mudstone tunnel projects,thereby ensuring tunnel construction and highway operation safety.