在隧道-土壤-管道相互作用的弹性连续体公式中引入隧道运动学约束条件

A. Klar, A. Franza, M. Zhou, H. W. Huang
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引用次数: 0

摘要

本文介绍了隧道工程对管道影响问题的一种新表述方法,该方法在隧道-土壤-管道相互作用分析中加入了隧道运动学约束。这种 "约束连续体公式 "可视为原始 "两阶段 "弹性连续体方法的延伸,该方法传统上忽略了管道对隧道的相互影响,反之亦然。新方法保留了将绿地条件作为输入的优点,但允许以闭合形式考虑隧道对土域的加固效应。本文详细介绍了这一方法,并对不同固定性的影响进行了研究:即既有 "现浇 "隧道,也有随隧道 "施工 "而变化的、不断推进的约束条件。本文提出了规范化解决方案,并与之前的方案进行了比较。一般来说,隧道约束的增加会导致土壤作用更加坚硬,从而增加管道的弯曲应力:隧道运动约束的建模是保守的。讨论了何时需要进行此类分析的问题,最后提出了适合设计的简单易用的不等式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Introducing tunnel kinematic constraints into an elastic continuum formulation of tunnel-soil-pipeline interaction
This paper presents a new formulation of the problem of tunnelling effects on pipelines, which incorporates the tunnel kinematic constraints in the tunnel-soil-pipeline interaction analysis. This ‘constrained continuum formulation’ can be considered an extension of the original ‘two-stage’ elastic-continuum method, which traditionally neglects the mutual influence of the pipeline on the tunnel and vice versa. The new approach retains the advantage of using the greenfield condition as an input, but it allows closed-form consideration of the stiffening effect of the tunnel on the soil domain. The paper details the formulation and, then, provides an investigation into the effect of varying fixities: namely, both as ‘wished-in-place’ tunnels and as evolving, advancing constraints, with the tunnel “construction”. Normalised solutions are presented and compared with the previous formulation. In general, the addition of tunnel constraints leads to a stiffer soil action and, thus, higher bending stressing in the pipeline: modelling of the tunnel kinematic constraint is conservative. The question of when such analysis is desired is discussed, concluding with a simple-to-use inequality suitable for design.
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