引水隧洞软岩变形破坏特征分析及支护方案
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摘要
以某引水隧洞工程初期支护被破坏为背景,探索围岩支护措施,以确保洞室围岩的稳定和施工安全。通过现场地质勘测资料、初期支护破坏现象以及围岩变形监测结果,分析软岩变形破坏特征,以改变支护结构、施工工艺以及支护时间制定新的支护方案。经后期监测结果显示,该方案下围岩的最大水平累计收敛位移为22.14mm,仅为初期变形量的7.6%,说明二次支护方案在设计上合理、技术上可行,为后续的安全施工积累了宝贵经验。
This paper has taken the destruction of the initial support of a diversion tunnel project as the background,and explored the surrounding rock support measures to ensure the stability and construction safety of the surrounding rock of the tunnel.The characteristics of soft rock deformation and failure are analyzed through geological survey data,initial support failure phenomenon and surrounding rock deformation monitoring results,so as to change the support structure,construction technology and support time to develop a new support program.The later monitoring results show that the maximum accumulated horizontal convergence displacement of the surrounding rock under this scheme is 22.14 mm,which is only 7.6% of the initial deformation,indicating that the secondary support scheme is reasonable in design and feasible in technology,which has accumulated valuable experience for the subsequent safe construction.
This paper has taken the destruction of the initial support of a diversion tunnel project as the background,and explored the surrounding rock support measures to ensure the stability and construction safety of the surrounding rock of the tunnel.The characteristics of soft rock deformation and failure are analyzed through geological survey data,initial support failure phenomenon and surrounding rock deformation monitoring results,so as to change the support structure,construction technology and support time to develop a new support program.The later monitoring results show that the maximum accumulated horizontal convergence displacement of the surrounding rock under this scheme is 22.14 mm,which is only 7.6% of the initial deformation,indicating that the secondary support scheme is reasonable in design and feasible in technology,which has accumulated valuable experience for the subsequent safe construction.
引文
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[2]赵大洲,丛苹,崔超,等.引汉济渭工程黄三段输水隧洞围岩变形与压力分析[J].水利水电技术,2017,48(8):59-62,125.
[3]李彦斌.水利工程隧洞软岩施工技术处理措施分析[J].黑龙江水利科技,2017,4(45):141-143.
[4]杨绍平,牟天江,李叶.引水隧洞软岩围岩变形特征分析及处理措施[J].四川水利,2016,4:19-23.
[5]周泽林.洞松水电站引水隧洞软岩大变形机理研究[D].西安:西安交通大学,2010.