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Analysis of Pipe-Roof in Tunnel Exiting Portal by the Foundation Elastic Model

机译：地基弹性模型分析隧道出口洞室顶板。

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摘要

The Pasternak double-parameter elastic foundation model of pipe-roof during the construction of tunnel exits is first established. Based on the portal project of Hanjiashan highway tunnel, an inclinometer is adopted to measure the settlement deformation of a pipe-roof and demonstrates the deformation law in tunnel exiting portals. The formulas for calculating the deflection and internal forces are derived to analyze the deformation of the pipe-roof in each excavation stage, and the results are compared with field monitoring data. Finally, the influences of excavation height, excavation footage, and stiffness of the pipe-roof on the support effect are investigated. Analysis indicates that the longitudinal settlement curve shows a groove distribution, which can be divided into five stages: micro, rapid, continuous, resilience, and stable deformation. Moreover, the subsidence rate reaches its maximum at the tunnel face. The influence of tunnel excavation on the deformation mainly has a range of 1.5 times the excavation height. To control the deflection of the pipe-roof, excavation height should be controlled in the range of 3.5 m, excavation footage should be controlled in the range of 1-1.4 m, and the diameter and thickness of the selected pipe-roof should be in the ranges of 89-159 mm and 5-8 mm, respectively.
机译：首先建立了隧道出口施工过程中管棚的Pasternak双参数弹性地基模型。在汉家山公路隧道洞口工程的基础上，采用测斜仪测量管棚的沉降变形，并论证了隧道出洞口的变形规律。推导了计算挠度和内力的公式，以分析各开挖阶段屋盖的变形，并将其与现场监测数据进行比较。最后，研究了开挖高度，开挖行程和管棚刚度对支护效果的影响。分析表明，纵向沉降曲线显示出沟槽分布，可分为五个阶段：微观，快速，连续，弹性和稳定变形。此外，在隧道工作面沉降速率达到最大值。隧道开挖对变形的影响范围主要是开挖高度的1.5倍。为了控制管棚的挠度，应将开挖高度控制在3.5 m的范围内，将开挖尺码控制在1-1.4 m的范围内，所选管棚的直径和厚度应在范围分别为89-159毫米和5-8毫米。

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  • 来源
    《Mathematical Problems in Engineering》 |2017年第10期|9387628.1-9387628.12|共12页
  • 作者

    Luo Yanbin; Chen Jianxun; Liu Bao; Chen Lijun; Xie Jiangtao;

  • 作者单位

    Changan Univ, Sch Highway, Middle Sect, Naner Huan Rd, Xian, Shaanxi, Peoples R China;

    Changan Univ, Sch Highway, Middle Sect, Naner Huan Rd, Xian, Shaanxi, Peoples R China;

    China Construction Seventh Engn Div Corp Ltd, Zhongjian Bldg,Chengdong Rd 108, Zhengzhou, Henan, Peoples R China;

    Changan Univ, Sch Highway, Middle Sect, Naner Huan Rd, Xian, Shaanxi, Peoples R China;

    Changan Univ, Sch Highway, Middle Sect, Naner Huan Rd, Xian, Shaanxi, Peoples R China;

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