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林存刚, 黄茂松. 基于Pasternak地基的盾构隧道开挖非连续地下管线的挠曲[J]. 岩土工程学报, 2019, 41(7): 1200-1207. DOI: 10.11779/CJGE201907003
引用本文: 林存刚, 黄茂松. 基于Pasternak地基的盾构隧道开挖非连续地下管线的挠曲[J]. 岩土工程学报, 2019, 41(7): 1200-1207. DOI: 10.11779/CJGE201907003
LIN Cun-gang, HUANG Mao-song. Deflections of discontinuous buried pipelines induced by shield tunnelling based on Pasternak foundation[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(7): 1200-1207. DOI: 10.11779/CJGE201907003
Citation: LIN Cun-gang, HUANG Mao-song. Deflections of discontinuous buried pipelines induced by shield tunnelling based on Pasternak foundation[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(7): 1200-1207. DOI: 10.11779/CJGE201907003

基于Pasternak地基的盾构隧道开挖非连续地下管线的挠曲

Deflections of discontinuous buried pipelines induced by shield tunnelling based on Pasternak foundation

  • 摘要: 盾构隧道开挖引起地下管线挠曲的准确预估对于其损伤评估与防护控制至关重要。引入Pasternak地基模型,采用有限差分方法推导了盾构隧道开挖地层损失下带接头管线的挠曲解答。经与离心机模型试验结果及连续弹性解对比,验证了该理论解答的适用性及其在运算效率方面的优势,并给出了地基剪切刚度的取值建议。参数分析发现,接头刚度会对管线挠曲产生显著影响,随接头刚度的增大,管线最大挠度降低,挠曲线形态趋近于连续管线;此外,接头数量及其分布也会对管线挠曲产生影响,其影响程度随接头数量的增大而削弱。

     

    Abstract: An accurate prediction of deflections of the buried pipelines induced by shield tunnelling is essential to their damage evaluation and control. By introducing the Pasternak foundation model, the finite difference method is used to deduce a solution to the deflections of jointed pipelines subject to shield tunnelling-induced ground loss. The applicability of this solution and its advantage in computational efficiency are verified by the results of a centrifuge model test and the elastic-continuum solution. Furthermore, a proposal is made for determination of the value of the subgrade shear stiffness. Afterwards, the parametric studies show that the deflection of the pipeline is significantly influenced by the stiffness of the joints. With the increase of their stiffness, the maximum deflection of the pipeline decreases, and the deflection of a jointed pipeline approaches to that of a continuous one. In addition, the deflection of the pipeline is affected by the amount and distribution of the joints to some extent. However, this effect decreases with an increase of the number of the joints.

     

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