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Numerical investigation of tunnel deformation due to adjacent loaded pile and pile-soil-tunnel interaction

机译：邻近荷载桩引起的隧道变形及桩-土-隧道相互作用的数值研究

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摘要

An adjacent construction with a pile foundation in dense urban areas can contribute to possible damage to or an operational safety concern for existing tunnels. To establish a preventive measure in the design stage, a proper assessment method for the impacts of an adjacent pile under loading on a tunnel and an understanding of pile soil-tunnel interaction are essential. This article recommends an assessment method for tunnel deformation, defined by the maximum extension and maximum contraction of the tunnel diameter and their associated axes with respect to the horizontal and vertical directions, respectively. The method could appropriately trace the changes to the tunnel diameter and the global distortion of the tunnel lining. Using a series of three-dimensional elasto-plastic numerical analyses conducted to investigate the influences of an adjacent loaded pile on an existing tunnel for varying pile tip positions with respect to the tunnel and soil stratum, the proposed method can effectively capture the response of the deformed tunnel as a distorted ellipse shape. Investigation of the analysis results from this assessment method in conjunction with those of the supplementary analyses of pile load reasonably reveal the pile-soil-tunnel interaction mechanism behind the tunnel deformation behaviour due to an adjacent loaded pile.
机译：在人口稠密的城市地区中，桩基相邻的建筑物可能会对现有隧道造成损坏或对运营安全造成影响。为了在设计阶段建立预防措施，对相邻桩在荷载作用下对隧道的影响进行正确评估的方法以及对桩土隧道相互作用的理解至关重要。本文推荐了一种隧道变形评估方法，该方法由隧道直径及其相关轴分别相对于水平和垂直方向的最大延伸和最大收缩来定义。该方法可以适当地追踪隧道直径和隧道衬砌整体变形的变化。使用一系列三维弹塑性数值分析来研究相邻荷载桩对现有隧道的影响，以改变桩尖相对于隧道和土壤地层的位置，所提出的方法可以有效地捕获桩基的响应。变形的隧道为扭曲的椭圆形。通过对这种评估方法的分析结果进行的调查以及对桩荷载的补充分析的研究，可以合理地揭示出由于相邻荷载引起的隧道变形行为背后的桩-土-隧道相互作用机制。

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