考虑土体改良的基坑开挖引起地铁隧道变形分析
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广西大学 土木建筑工程学院

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U45

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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)


Analysis of subway tunnel deformation due to pit excavation considering soil improvement
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School of Civil and Architectural Engineering,Guangxi University

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    摘要:

    基坑开挖引起下卧地铁隧道不均匀变形,过大的变形会使隧道发生破坏,基于实际工程存在土体改良问题,引入考虑土体满堂加固的坑底和侧壁卸荷模型,计算基坑开挖卸荷作用下对下卧运营隧道产生的附加应力。在此基础上,采用Timoshenko梁置于利夫金地基模型来考虑隧道剪切效应和土体连续性的影响,建立隧道变形微分方程,采用有限差分的方法求解微分方程,从而得到隧道纵向变形矩阵表达式。与实测工程数据进行对比,验证所提方法的准确性和适用性。研究结果表明:与所提方法可退化的Winker地基模型比较,考虑土体连续性的利夫金模型更接近实测数据。

    Abstract:

    the pit excavation causes uneven deformation of the underlying subway tunnel, and the excessive deformation will cause the tunnel to be destroyed. Based on the existence of soil improvement problems in the actual project, a pit bottom and sidewall unloading model considering soil full reinforcement is introduced, this model is used to calculate the additional stresses on the underlying operating tunnel caused by the unloading effect of the pit excavation. On this basis, the Timoshenko beam placed in the Lifking foundation model is used to consider the effects of tunnel shear effect and soil continuity and the differential equation of tunnel deformation is established, and the finite difference method is used to solve the differential equations, so as to obtain the expression of tunnel longitudinal deformation matrix. The proposed method is compared with the measured engineering data to verify the accuracy and applicability of the proposed method. The results show that, compared with the degradable Winker foundation model of the proposed method, the Lifking model considers the continuity of the soil, it is closer to the measured data.

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蒋明杰,谢忠铭,吕林海,等. 考虑土体改良的基坑开挖引起地铁隧道变形分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-08-12
  • 最后修改日期:2023-11-14
  • 录用日期:2023-12-02
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