文档介绍：ENGINEERS IRELAND
__________________________________________________________________________________
DEEP EXCAVATIONS IN DUBLIN
RECENT DEVELOPMENTS
_________________________________________
Michael Looby, Director, Byrne Looby Partners.
Dr. Mike Long, Senior Lecturer, University College Dublin.
Paper first presented to a meeting of the Geotechnical Society of Ireland at Engineers Ireland, 22 Clyde Rd, Dublin 4, on 11 th December
2007.
Photograph shows Westgate 14 m deep excavation in June 2006
SYNOPSIS
A number of Deep Excavations up to 23m in depth have recently pleted in Dublin. Different approaches including propped and
unpropped, Secant and Contiguous Pile Wall Solutions have been employed on various projects. The paper updates a database for propped
and cantilevered wall supported excavations in Glacial Tills. ment and interpretation of recorded wall movement versus retained
heights and wall stiffness is provided. Modelled predications are also discussed. A number of case histories of deep basement excavations
including Spencer Dock in the Docklands, 14m excavation at Westgate (Heuston Square) and other projects are presented and discussed.
1
1. INTRODUCTION colour from black to brown and a lower 3. SITUATION UP TO 2002
strength material.
The recent period of sustained economic Up to about five years ago, basements in
growth in Ireland has led to an increase in the With the construction of the Dublin Port Dublin prised two underground
use of underground space, with some Tunnel, a clearer understanding of the levels and were often constructed within
development now including 4 underground detailed geology of these deposits has lightly supported contiguous or secant piled
levels. This period has also seen the emerged, see Skipper et al. (2005). The retaining walls. Some typical examples of
development of marginal sites, for example details of the engineering properties and these projects are