秦岭特长隧洞超埋深强构造应力大变形处理技术研究

发布时间：2018-04-18 02:10

  本文选题：秦岭特长输水隧洞 + 超埋深　； 参考：《水利水电技术》2017年07期

【摘要】：引汉济渭秦岭特长输水隧洞全长81.779 km,隧洞穿越秦岭岭南中低山区,地质条件极其复杂,断裂构造极为发育,且具有强构造应力。受复杂地质条件和地质构造的影响,秦岭隧洞1~#勘探试验洞主洞段施工中发生了不同程度的大变形,原设计围岩类别为Ⅲ类,实际施工过程中已经达到Ⅳ类和Ⅴ类,初期支护完成后变形严重。多处变形量超过10 mm/d,局部最大变形量达到了69 cm,给施工带来了极大的困难。对发生大变形段采取了二次套拱、加长锚杆、径向注浆、初支拆换、二次衬砌加强等措施进行控制。今后大变形段设计施工过程中,应通过加强超前地质预报与监控量测、提高支护设计参数、加大预留变形量来预防大变形的发生。
[Abstract]:The extra long water conveyance tunnel in the Qinling Mountains of the Han Dynasty and the Jiwei Mountains is 81.779 km long. The tunnel passes through the middle and low mountain areas in the south of Qinling Mountains. The geological conditions are extremely complex, the fault structures are extremely developed, and the tunnel has strong tectonic stress.Under the influence of complex geological conditions and geological structures, large deformation occurred in the main section of Qinling Tunnel 1 ~ # exploration test tunnel in different degrees. The original designed surrounding rock was classified into class 鈪，

本文编号：1766315