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Centrifuge modelling of tunnelling induced ground displacements: pressure and displacement control tunnels

机译：隧道诱导地层离心建模：压力和位移控制隧道

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摘要

Predicting the impact of tunnelling-induced ground movements on existing foundation systems or infrastructure is an important stage during tunnel design or risk assessment processes. Centrifuge modelling has been used extensively as a tool to study soil movements caused by tunnelling and their interactions with existing structures. In 2D plane-strain centrifuge models, tunnel volume loss can be simulated in a variety of ways, but is conventionally done using a fluid-filled flexible membrane or a rigid boundary mechanical model tunnel. The choice of model tunnel has an impact on the imparted tunnel boundary displacements and resulting ground deformations, yet a thorough quantitative evaluation of these effects has not been conducted. This paper aims to address this by contrasting plane-strain centrifuge test results from experiments using a flexible membrane model tunnel with those from a newly developed eccentric rigid boundary mechanical model tunnel. A quantitative assessment of surface and subsurface settlement trough characteristics as well as soil shear and volumetric response is provided. Results from numerical analyses using a hypoplastic constitutive model are also included, focusing on evaluating centrifuge spin-up effects and contrasting numerical outcomes with experimental data relating to settlement trough characteristics and soil shear/volumetric response. The outcomes of this paper should benefit future researchers considering which type of model tunnel to adopt when developing centrifuge tests related to 2D plane-strain tunnel modelling.
机译：预测隧道诱导的地面运动对现有基础系统或基础设施的影响是隧道设计或风险评估过程中的重要阶段。离心机建模已被广泛用于研究隧道隧道造成的土壤运动的工具及其与现有结构的相互作用。在2D平面 - 应变离心机模型中，可以以各种方式模拟隧道体积损失，但是通常使用流体填充的柔性膜或刚性边界机械模型隧道进行。模型隧道的选择对赋予透雕的隧道边界位移并产生了地面变形，但尚未进行彻底的定量评估这些效果。本文旨在通过使用柔性膜模型隧道与新开发的偏心刚性边界机械模型隧道的实验对比平面 - 应变离心机测试结果来解决这一点。提供了对表面和地下沉降槽特性以及土壤剪切和体积响应的定量评估。还包括使用HypOpplastic构成模型的数值分析的结果，专注于评估离心旋转效果和与与沉降槽特性和土壤剪切/体积反应有关的实验数据的对比数值。本文的结果应使未来的研究人员受益考虑在开发与2D平面 - 应变隧道建模相关的离心机测试时采用哪种类型的模型隧道。

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