Abstract

Influence of building characteristics on tunnelling-induced ground movements

Highlights

  • Predicting building response to tunnelling-induced settlement is essential for urban tunnelling projects, but remains a challenge due to the complex soil–structure interaction

  • These settlement profiles are predicted by making assumptions on the tunnelling-induced ground loss and the width of the settlement trough, which both depend on the tunnelling method and the ground conditions

  • The potential soil– structure interaction during the tunnelling procedure is considered using modification factors, which quantify the alteration of greenfield displacements as a function of the given relative building stiffness

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Summary

INTRODUCTION

Predicting building response to tunnelling-induced settlement is essential for urban tunnelling projects, but remains a challenge due to the complex soil–structure interaction. Parametric studies have enabled the translation of such modelling results into empirical design methods (Potts & Addenbrooke, 1997; Franzius et al, 2006; Goh & Mair, 2012; Giardina et al, 2015a) These so-called relative stiffness approaches, which relate the building stiffness to the soil stiffness, compare the actual settlements with the settlements in greenfield conditions, where no buildings are present. Mεht 1⁄4 εht;Str εht;GF ð2aÞ ð2bÞ where εhc and εht are the compressive and tensile horizontal strains of the structure (Str) or the greenfield equivalent (GF) These relative building stiffness methods highlight the soil–structure interaction effects, surface structures are simplified as elastic beams and building characteristics (e.g. facade openings or non-linear material behaviour) are not considered. The results of a greenfield test performed by Farrell (2010), which replicated the identical tunnelling prototype, are presented in this paper

DIC pattern
Strip foundation
Structure C Structure B
Structure B and D Structure E and F
CONCLUSIONS
The authors thank the Engineering and Physical Sciences
Findings
NOTATION B building width C cover D tunnel diameter

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