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首页> 外文期刊>Tunnelling and underground space technology >Tunnelling effects on lateral behavior of pile rafts in layered soil
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Tunnelling effects on lateral behavior of pile rafts in layered soil

机译：隧道对层状土中筏板横向性能的影响

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摘要

The Mindlin's solution or Winkler model is often adopted to estimate the response of piles subject to ground movements induced by tunnelling in the literature. Those methods are reasonable for piles in homogeneous soil, while soil systems are usually layered in practice. This paper presents a simplified analysis method that can be used to estimate lateral responses of pile rafts subject to ground movements induced by tunnelling in layered soil. The problem is solved in two stages: firstly, using the Loganathan Poulos solution to calculate lateral free soil movements induced by tunnelling; secondly, composing the calculated free soil movements to the pile, the governing equilibrium equations of piles are solved by the finite difference method combined with the displacement and stress solutions for asymmetric loads in layered elastic system. Also, the lateral interactions between structural members, pile-pile, pile-soil, pile-raft and soil-raft, are modeled based on the solutions for asymmetric loads in layered elastic system in the method presented herein. The proposed method is verified using published results, centrifuge tests results and displacement-controlled finite element method results. The study shows that the proposed method can reasonably estimate the lateral responses of pile rafts induced by tunnelling. Additionally, the influence of soil stiffness variation is discussed. The study shows the maximum deflections and bend ing moments appear near the spring line of the tunnel. And the lateral behaviors of the piles are more significantly influenced by the stiffness of the underlying soil which the tunnel located in than the stiff ness of the overlying soil.
机译：在文献中，通常采用Mindlin解或Winkler模型来估计桩在隧道引起的地震动作用下的响应。这些方法对于均质土壤中的桩是合理的，而土壤系统通常在实践中是分层的。本文提出了一种简化的分析方法，该方法可用于估计层状土壤中隧道开挖引起的地震动对桩筏的横向响应。该问题分为两个阶段解决：首先，使用Loganathan Poulos解决方案来计算隧道效应引起的横向自由土壤运动。其次，将计算出的自由土运动计算为桩，通过有限差分法结合层状弹性系统中非对称荷载的位移和应力解，求解了桩的支配平衡方程。而且，基于本文提出的方法中的层状弹性系统中非对称载荷的解，对结构构件，桩-桩，桩-土壤，桩-筏和土壤-筏之间的横向相互作用进行建模。公开的结果，离心测试结果和位移控制的有限元方法结果验证了该方法的有效性。研究表明，该方法可以合理地估算隧道引起的桩筏的横向响应。此外，还讨论了土壤刚度变化的影响。研究表明，最大挠度和弯矩出现在隧道的弹簧线附近。隧道所处的地下土壤的刚度比上覆土壤的刚度对桩的侧向性能的影响更大。

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  • 来源
    《Tunnelling and underground space technology》 |2012年第2012期|p.192-201|共10页
  • 作者

    Linlong Mu; Maosong Huang; Richard J. Finno;

  • 作者单位

    Department ofCeotechnical Engineering, Tongji University, Shanghai 200092, China,Key Laboratory of Ceotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China,Department of Civil and Environment Engineering, Northwestern University, Evanston, IL 60201, USA;

    Department ofCeotechnical Engineering, Tongji University, Shanghai 200092, China,Key Laboratory of Ceotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;

    Department of Civil and Environment Engineering, Northwestern University, Evanston, IL 60201, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    tunnelling; pile raft; layered soil; passive pile;

    机译：隧道排筏分层土壤被动桩;

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