| 毛羽山隧道高地应力软岩大变形施工控制技术 |
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| 引用本文： | 李廷春.毛羽山隧道高地应力软岩大变形施工控制技术[J].现代隧道技术,2011,48(2):59-67. |
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| 作者姓名： | 李廷春 |
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| 作者单位： | 中铁第五勘察设计院集团有限公司,北京,102600 |
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| 摘 要： | 兰渝铁路毛羽山隧道出口段穿越薄层状碳质板岩地层,区域原岩应力较大且以水平构造应力为主,隧道开挖过程中出现严重的大变形情况。通过分析,认为高地应力、最大水平主应力与隧道轴线呈大角度相交是大变形的主要因素。隧道施工过程中,通过采取提高支护体系刚度、合理预留变形量,以及采用长锚杆、多重支护和超短台阶法等常规措施控制了围岩变形;基于对围岩动态演化机制的认识,提出了高地应力隧道超前导洞法应力控制释放技术,开展了大型工程试验。阶段性试验成果表明,采用超前导洞有效地降低了正洞施工时的变形速率,对上中台阶影响尤为显著。通过对应力控制释放技术研究的进一步深化,有望探索出安全、高效的高地应力软岩施工新技术。
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| 关 键 词： | 毛羽山隧道 薄层碳质板岩 高地应力 超前导洞 应力释放 变形控制 |
Large Deformation Control Technology for Maoyushan Tunnel in Soft Rock under High in-situ Stresses |
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| Li Tingchun.Large Deformation Control Technology for Maoyushan Tunnel in Soft Rock under High in-situ Stresses[J].Modern Tunnelling Technology,2011,48(2):59-67. |
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| Authors: | Li Tingchun |
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| Institution: | Li Tingchun(China Railway 5th Survey and Design Institute Group Company,Beijing 102600) |
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| Abstract: | The exit of Maoyushan tunnel on Lanzhou-Chongqing railway is embedded in thin-layered carbonaceous slate stratum with high in-situ stresses of primary rock and horizontal tectonic stresses.During tunnel excavation,intensive large deformations and serious failures occurred due to high in-situ stresses and maximum horizontal principal stresses intersected with the tunnel axis with a large angle.Measures such as improving support system stiffness,lengthening systematic bolts,reasonable allowances for deformati... |
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| Keywords: | Maoyushan tunnel Thin-layered carbonaceous slate stratum High in-situ stress Advance adit Stress releasing Deformation control |
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