浅埋偏压黄土隧道塌方处治及效果分析

发布时间：2018-03-08 23:06

本文选题：黄土隧道　切入点：塌方　出处：《现代隧道技术》2017年02期 　论文类型：期刊论文

【摘要】：为研究软弱黄土隧道塌方处治效果,文章以宝天高速某隧道洞口段塌方治理工程为依托,分析了隧道塌方的主要原因,提出采用超前大管棚与注浆小导管相结合、洞内与地表共同治理的综合处治措施,并通过现场实测与数值计算相结合的方法详细分析了处治效果。结果表明:地形浅埋偏压、设计偏于不安全、降雨通过地表裂缝浸泡围岩等因素最终导致隧道坍塌、地表塌陷;处治后塌方段初期支护和二次衬砌的变形及受力在20 d后趋于稳定,且均未发生异常变化,处治效果良好;现场监测和数值计算的拱顶沉降和周边收敛规律基本一致,相关变化值都在规范的允许范围之内,处治后隧道结构处于稳定状态。研究结果可为类似隧道工程塌方处治提供借鉴。
[Abstract]:For the study of soft loess tunnel collapse treatment effect, the landslide control project of a high-speed tunnel entrance Baotian based on the analysis of the main reasons for tunnel collapse, the lead pipe shed and small duct grouting combined with comprehensive treatment measures and the surface of common governance, and combining the field test and numerical calculation. A detailed analysis of the treatment effect. The results show that the bias of the shallow terrain, the design is unsafe, rainfall through surface cracks of surrounding rock and other factors resulting in immersed tunnel collapse, surface collapse; collapse treatment after initial deformation of support and lining two and are stable at 20 D, and there was no abnormal change, treatment effect is good; the settlement calculation of site monitoring and numerical vault and the surrounding convergence conforms to related changes in values are within the allowable range of the code, after the treatment of tunnel junction The results can provide a reference for the treatment of similar tunnel collapse.

【作者单位】：长安大学特殊地区公路工程教育部重点实验室;中建丝路建设投资有限公司;中铁第一勘察设计院集团有限公司;
【基金】：中央高校基本科研业务费专项基金项目(310821172004;310821153312;310821165011) 交通运输部西部交通建设科技项目(200731800018)
【分类号】：U458.3

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