State Key Laboratory for Geomechanics and Deep Underground Engineering
School of Mechanics and Civil Engineering,China University of Mining and Technology

云南他白依隧道位于青藏高原东麓,穿越多条断层构造带,其围岩软弱破碎,遇水强度骤降。原设计方案下围岩存在米级大变形,出现了拱架扭曲、仰拱隆起和突泥涌水等灾害。针对富水断层带隧道围岩破碎难题,首先通过矿物成分分析、点荷载试验及地应力测试,分析了富水断层带隧道变形力学机制及其转化,通过未注浆、常规注浆及双梯度注浆的围岩承载力试验,确定采用双梯度注浆工艺进行NPR锚索锚固;然后,通过数值模拟及现场试验,得出了最佳锚索数目;最后,通过现场应用,基于监测数据验证了双梯度注浆及高预紧力长短NPR锚索支护体系的可靠性。研究结果可为类似富水断层带隧道的大变形灾害控制提供参考。

Tabaiyi Tunnel is located in the eastern foothill of the Tibetan Plateau,crossing a multi-stageropes;then,the optimal anchor rope number was derived from the numerical simulation and on-site test;finally,through the on-site application,the optimal anchor rope number was obtained. Finally,the reliability of the double gradient grouting and high preload long and short NPR anchor cable support systemis verified through field application. Based on monitoring data,the results of the study can be used as areference for the control of large deformation hazards in similar tunnels with water-rich fault zones.

深部岩土力学与地下工程国家重点实验室创新基金(SKLGDUEK202201)

陶志刚,周子琮,杨晓杰,等 . 富水断层带隧道变形力学机制及双梯度注浆 NPR 补偿对策[J]. 矿业科学学报,2023,8(6):768-779. DOI:10. 19606 / j. cnki. jmst. 2023. 06. 004

Tao Zhigang,Zhou Zicong,Yang Xiaojie,et. al. Mechanics of tunnel deformation in water-rich fault zone and double-gradient grouting NPR compensa-tion countermeasures [J]. Journal of Mining Science and Technology,2023,8(6):768-779. DOI:10. 19606 / j. cnki. jmst. 2023. 06. 004