考虑管道剪切效应的隧道下穿引起既有管道竖向位移的简化计算方法
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1.华东交通大学;2.浙江航海城际铁路有限公司;3.中交一公局集团有限公司

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Simplified Method for Calculating the Vertical Displacement of Existing Pipelines Caused by Tunnel Undercrossing Considering the Pipe Shear Effect
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1.East China Jiaotong University;2.Zhejiang Hanghai Intercity Railway Co., Ltd.;3.CCCC First Highway Engineering Group Co., Ltd.

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    摘要:

    采用两阶段法推导了考虑管道剪切效应时,盾构隧道下穿施工引起既有管道竖向位移的解析解。在第一阶段采用Loganathan公式计算盾构隧道下穿管道施工引起的管道轴线处土体竖向位移,第二阶段采用考虑剪切效应的Timoshenko梁模型模拟管道,并结合叠加法对管道位移控制方程进行求解,提出了简化计算方法。通过与工程监测、既有文献结果及离心机试验数据的对比,验证了本文方法的正确性,并进一步分析了管—土弹性模量比、管道直径以及管道剪切刚度变化对管道变形的影响。分析结果表明:随着管—土弹性模量比、管道直径的增大,管道的竖向最大位移值减小;管道剪切刚度对管道位移存在较大影响,剪切刚度减小可导致管道最大位移值增大。

    Abstract:

    The two-stage method is used to analyze the pipeline shear deformation which caused by the underneath shield tunneling. In the first stage, the Loganathan formula is applied for studying the ground loss at the pipeline axis caused by the tunneling. The Timoshenko beam theory and superposition method are combined to simulate the pipeline deformation. Then, through comparison with the existing results and engineering monitoring and centrifuge test data, the proposed result was verified to be correct. The influence of ratio of elastic modulus of pipe to soil, the diameter of pipe and the shear stiffness of pipe on the pipe deformation has been further studied. The results show that the maximum vertical displacement of the pipe decreases with the increase of the tube-to-soil modulus ratio and the diameter of the pipe. The shear stiffness of the pipeline has a great influence on the displacement of the pipeline, and the decrease of the shear stiffness can lead to the increase of the maximum displacement of the pipeline.

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历史
  • 收稿日期:2020-07-21
  • 最后修改日期:2020-09-29
  • 录用日期:2020-10-01
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