Prediction of tunnel localized water leakage influences on adjacent lateral pile responses in saturated clay

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Wenbo Gu, Liyuan Tong, Wenyuan Liu, Xin Yan, Hongjiang Li
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Abstract

In the realm of constructing urban underground spaces, it is imperative to address the impact of tunnel leakage on the surrounding environment. This paper introduced a theoretical analysis to investigate the localized water leakage's influence on adjacent pile foundations. A pore pressure distribution function, accounting for localized leakage water, was formulated. Integrated with the seepage control equation, this function facilitated the calculation of additional stress imposed on piles due to tunnel localized water leakage. Employing the Pasternak foundation model, an analytical solution was developed to assess the lateral performance of adjacent piles under localized water leakage conditions. This approach was compared with numerical simulations to validate the reliability of soil seepage fields and pile lateral performance resulting from localized tunnel leakage at different positions. Through comprehensive parameter analysis, it was observed that the width of the leakage joint significantly influenced pile lateral responses, manifesting in three distinct stages: linear increase, nonlinear gradual augmentation, and stabilization. Different positions of the lining leakage joint yielded varying effects on adjacent piles' lateral responses, with closer proximity intensifying the impact on the pile. When leakage joints were situated near the pile toe, a pronounced negative bending moment was generated. Furthermore, this study summarized the influence range of tunnel localized leakage adjacent to piles. It established that the maximum pile-tunnel horizontal distance inducing lateral pile responses due to tunnel localized leakage was set at 8 times the pile diameter (8 Dp). Additionally, tunnel leakage influences should be considered when the pile length exceeded 0.6 times the depth of the tunnel axis.

Abstract Image

Abstract Image

预测隧道局部渗漏水对饱和粘土中相邻侧向桩响应的影响
在城市地下空间建设领域,必须解决隧道渗漏水对周围环境的影响。本文通过理论分析,研究了局部渗漏水对相邻桩基的影响。本文提出了一个考虑局部渗漏水的孔隙压力分布函数。该函数与渗流控制方程相结合,有助于计算隧道局部渗漏水对桩基造成的附加应力。利用帕斯捷尔纳克地基模型,开发了一种分析解决方案,用于评估局部渗漏水条件下相邻桩基的横向性能。该方法与数值模拟进行了比较,以验证不同位置隧道局部渗漏造成的土壤渗流场和桩侧向性能的可靠性。通过综合参数分析发现,渗漏水接头的宽度对桩侧向响应有显著影响,表现为三个不同阶段:线性增加、非线性逐渐增加和稳定。衬砌渗漏缝的不同位置对相邻桩的横向响应产生不同的影响,距离越近对桩的影响越大。当渗漏点靠近桩趾时,会产生明显的负弯矩。此外,该研究还总结了邻近桩基的隧道局部渗漏的影响范围。研究确定,隧道局部渗漏引起桩侧向响应的最大桩-隧道水平距离为桩直径的 8 倍(8 Dp)。此外,当桩长超过隧道轴线深度的 0.6 倍时,应考虑隧道渗漏的影响。
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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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