Analysis of microtunnel jacking forces in alluvium and glacial till in Mullingar, Ireland
Reilly, Ciaran C.
Orr, Trevor L.
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Reilly, C.C., McCabe, B.A. and Orr, T.L.L. (2012) Analysis of microtunnel jacking forces in alluvium and glacial till in Mullingar, Ireland World Tunnelling Conference Bangkok,
The number of successful microtunnelling drives completed in Ireland is growing rapidly. However, current jacking force predictions rely on experience from the UK and beyond, often gained through work in soils with a small range of particle sizes. Irish soils have particular characteristics that can affect their behaviour; for example, Irish glacial tills are frequently well - graded, with a wide range of particle sizes from clay to gravel. Jacking force relationships developed for more uniform soils may not be appropriate in these conditions. This paper aims to address these issues by presenting jacking force records for micro tunnel drives constructed using three different slurry shield microtunnelling machines in two different soil types during sewerage pipeline construction in Mullingar in the midlands of Ireland.