隔离桩对隧道引起的地面垂直位移约束作用的解析解

IF 9.4 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Journal of Rock Mechanics and Geotechnical Engineering Pub Date : 2023-10-01 DOI:10.1016/j.jrmge.2023.03.002
Liqiang Cao , Xiangsheng Chen , Xing-Tao Lin , Dong Su , Huangcheng Fang , Dechun Lu
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引用次数: 0

摘要

本文提出了一种计算隔震桩对隧道引起的地面竖向位移约束效应的简化弹性连续体方法,该方法不仅考虑了桩-土界面的相对滑动,而且考虑了桩-土相互作用。通过与边界元法、弹性地基法等现有理论方法的比较,验证了所提方法的有效性。研究结果揭示了隔震桩对隧道开挖引起的地面竖向位移的抑制机制,即隔震桩的正约束和负约束共同作用,使地面竖向位移沿深度方向由原来的隧道开挖引起的非线性变化情况向相对均匀的变化情况转变。分析结果还表明,桩-土界面(包括桩身-周围土界面和桩端-支承土界面)的刚度描述了桩-土相互作用的强度。桩排可以将隧道开挖引起的地面竖向位移限制在隔震桩内侧,有效地防止了地面竖向位移进一步向隔震桩外侧扩展。
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Analytical solutions for the restraint effect of isolation piles against tunneling-induced vertical ground displacements

This paper presents a simplified elastic continuum method for calculating the restraint effect of isolation piles on tunneling-induced vertical ground displacement, which can consider not only the relative sliding of the pile‒soil interface but also the pile row–soil interaction. The proposed method is verified by comparisons with existing theoretical methods, including the boundary element method and the elastic foundation method. The results reveal the restraining mechanism of the isolation piles on vertical ground displacements due to tunneling, i.e. the positive and negative restraint effects exerted by the isolation piles jointly drive the ground vertical displacement along the depth direction from the original tunneling-induced nonlinear variation situation to a relatively uniform situation. The results also indicate that the stiffness of the pile‒soil interface, including the pile shaft‒surrounding soil interface and pile tip-supporting soil interface, describes the strength of the pile‒soil interaction. The pile rows can confine the vertical ground displacement caused by the tunnel excavation to the inner side of the isolation piles and effectively prevent the vertical ground displacement from expanding further toward the outer side of the isolation piles.

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来源期刊
Journal of Rock Mechanics and Geotechnical Engineering
Journal of Rock Mechanics and Geotechnical Engineering Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology
CiteScore
11.60
自引率
6.80%
发文量
227
审稿时长
48 days
期刊介绍: The Journal of Rock Mechanics and Geotechnical Engineering (JRMGE), overseen by the Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, is dedicated to the latest advancements in rock mechanics and geotechnical engineering. It serves as a platform for global scholars to stay updated on developments in various related fields including soil mechanics, foundation engineering, civil engineering, mining engineering, hydraulic engineering, petroleum engineering, and engineering geology. With a focus on fostering international academic exchange, JRMGE acts as a conduit between theoretical advancements and practical applications. Topics covered include new theories, technologies, methods, experiences, in-situ and laboratory tests, developments, case studies, and timely reviews within the realm of rock mechanics and geotechnical engineering.
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