| 偏压隧道变形破坏机理及超前预加固研究 |
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| 引用本文： | 白皓,潘文韬,谢金池,向宝山,杨文波,徐迪,王飞.偏压隧道变形破坏机理及超前预加固研究[J].路基工程,2021,0(4):218-224. |
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| 作者姓名： | 白皓 潘文韬 谢金池 向宝山 杨文波 徐迪 王飞 |
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| 作者单位： | 1.四川高速公路建设开发集团有限公司，成都 610041 |
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| 基金项目： | 四川省科技计划项目资助:九绵高速公路大规模层状变质软岩隧道群建设关键技术研究（2019YFG0001） |
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| 摘 要： | 依托九绵高速福隆隧道工程，通过建立三维山体隧道模型对偏压隧道围岩支护体系受力变形特征进行分析，并通过数值模拟与现场监测对不同超前加固方式进行对比研究。结果表明:受偏压地形影响，隧道围岩变形、塑性区分布、二衬受力等均存在非对称现象；隧道开挖时，拉应力出现在掌子面、仰拱、回填土处，塑性区分布深入掌子面后方约3 m，且掌子面的土体有向外挤出的趋势；偏压地形下，适用性较好的超前加固方式为双层注浆小导管，在有效控制围岩变形、塑性区以及二衬等受力同时具有良好的经济性；现场测得K89+317断面的拱腰收敛与拱顶、地表变形较小且收敛较快，验证了双层小导管的适用性。
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| 关 键 词： | 偏压隧道 超前预加固 围岩变形 数值模拟 现场监测 |
| 收稿时间： | 2020-12-28 |
Research on Deformation and Failure Mechanism of Unsymmetrical Loading Tunnel and Advanced Pre-reinforcement |
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| Abstract: | Based on Fulong Tunnel of Jiumian Expressway, the stress and deformation characteristics of surrounding rock support system of unsymmetrical pressure tunnel has been analysed by establishing a three-dimensional mountain tunnel model, and different advanced reinforcement methods have been reseached comparatively and selected through numerical simulation and field monitoring. The results show that there is asymmetric phenomenon for the deformation of surrounding rock, the distribution of plastic zone and the stress of secondary lining under the influence of the biased pressure terrain. When the tunnel is excavated, the tensile stress appears at the face of the tunnel, the invert and the backfill soil, and the plastic zone is distributed about 3 m behind the face of the tunnel, and the soil at the face of the tunnel tends to extrude outward. The suitable advance reinforcement method is double-layer grouting small conduit in biased terrain, which can effectively control the deformation of surrounding rock, plastic zone, secondary lining and other forces with good economical efficiency. Field measurements of K89+317 section show that the convergence of the waist arch and the deformation of the vault and the surface is small but fast, which verifies the applicability of the double-layer small conduit. |
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