Late Pleistocene-Holocene Buried Valleys in the Cork Syncline, Ireland

Davis, T.; MacCarthy, I. A. J.; Allen, Alistair; Higgs, Bettie

doi:10.4113/jom.2006.48

Cited by 6 publications

(9 citation statements)

References 3 publications

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“…Pleistocene rivers rapidly cut steep sided gorges to the new base level to meet these low sea-level positions. The result was the creation of a classic U-shaped glacial trough with a base possibly in excess of -100 mOD (Davis et al, 2005, Devoy, 2005, which was subsequently infilled with glaciofluvial sands and gravels. This large aquifer provides a groundwater source close to the surface, enhancing the potential for open loop geothermal exploration and exploitation in the area at low to medium costs.…”

Section: Cork Geological Settingmentioning

confidence: 99%

Geothermal energy: settlement and water chemistry in Cork, Ireland

Hemmingway

Long

2011

Proceedings of the Institution of Civil Engineers - Engineering

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Water extracted from beneath the Docklands shows that significant water chemistry issues exist.Laboratory and field tests confirm that optimal concentration levels of several water chemistry characteristics are significantly exceeded; leading to the conclusion that open loop exploitation in the area may not be suitable. In addition, settlement induced by pumping of water could potentially lead to a consolidation settlement in excess of 30 mm due primarily to the existence of highly compressible alluvium. Notation: strain

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Section: Cork Geological Settingmentioning

confidence: 99%

Geothermal energy: settlement and water chemistry in Cork, Ireland

Hemmingway

Long

2011

Proceedings of the Institution of Civil Engineers - Engineering

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“…Detailed accounts of the background bedrock and Quaternary sediment geology in Cork have been given by several authors (e.g. Reilly and Sleeman 1977;Sleeman 1991;MacCarthy 2002;Devoy 2005 andDavis et al 2006) and thus a brief summary is only provided here.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Quaternary deposits in Cork city are comprised of thick Pleistocene glacial diamicts/tills and fluvio-glacial sediments and interglacial deposits and Holocene interglacial marine, estuarine and alluvial deposits infilling glacially over-deepened valleys eroded into the underlying Carboniferous limestone bedrock (Davis et al 2006). Throughout the Pleistocene ice sheets and interglacial fluvial systems eroded and deepened east-west oriented Variscaninfluced bedrock depressions.…”

Section: Quaternary Periodmentioning

confidence: 99%

“…The distribution and engineering characteristics of the fluvio-glacial gravels beneath Cork city have been well established. Detailed reports have been published on the design of piled foundations in these materials (Collins and Mitchell 1990), on the construction of deep basements, with a particular emphasis on dewatering of the gravels (Long et al 2015), on their economic potential for production of geothermal energy (Allen and Milenic 2003;Hemmingway and Long 2011) and on their general distribution within the Cork city syncline (Davis et al 2006). However, the stiff interglacial clays found sporadically within the thick gravel sequences of the Cork city syncline are poorly characterised and are often overlooked at the desk study stage of site investigation.…”

Section: Introductionmentioning

confidence: 99%

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The distribution and engineering properties of interglacial deposits in Cork city and harbour

Curtis,

Long

2024

ijes

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A reassessment of existing data and additional testing on sediment core samples from one site was used to study the extent, nature, composition and engineering properties of the Quaternary interglacial deposits in an area of Cork city and harbour where many future developments are planned. A clear link is apparent between rockhead elevation and the presence of the interglacial deposits. Well-defined pockets of the deposit were proven. These are found mostly on the southern side of the Cork buried valley axis and increase in thickness to the north. The base of the interglacial deposits appears to mirror that of the rock-head and the western extent of the former coincides with a steep drop off in the latter. Much of the deposit encountered in commercial investigations is a thick relatively uniform silt/clay consistent with that described in previous studies. The sediment is predominantly silt sized, but its behaviour and engineering properties are consistent with those of a stiff clay. Sample disturbance effects were found to be significant and these likely result in an underestimation of the preconsolidation stress and the undrained shear strength of the material. Future work would benefit from the use of in-situ site investigation and geophysical techniques.

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“…Detailed accounts of the background geology in Cork have been given by Nevill (1969), Whittow (1974), Reilly & Sleeman (1977), Sleeman (1991), Allen et al (1999), MacCarthy (2002), Devoy (2005), Milenic & Allen (2005) and Davis et al (2006), and thus a brief summary only is warranted here.…”

Section: Background Geologymentioning

confidence: 99%

Deep excavations in water-bearing gravels in Cork

Long

Murphy²,

Roberts

et al. 2015

QJEGH

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Historically only shallow basements were included in developments in Cork city owing to the underlying layers of soft alluvium and high-permeability glaciofluvial gravels. In recent times several large schemes, with basements up to 10 m deep, have been completed. In this paper the design and performance of these developments is summarized. Particular emphasis is placed on two schemes at Eglinton St. and Half Moon St. Although dewatering by deep well systems is feasible, flow rates can be substantial. Careful consideration needs to be given to the site-specific properties of the glaciofluvial gravels to permit the level of the cut-off to be efficiently chosen so as to minimize inflows and external groundwater lowering and to mitigate against the possible risk of surface settlements. A ‘soft gel’ grout blanket was used successfully as an alternative at one site. Lateral wall movements were low and it seems possible that more efficient designs are possible, especially if the small strain stiffness and dilation properties of the material are taken into account.

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Late Pleistocene-Holocene Buried Valleys in the Cork Syncline, Ireland

Cited by 6 publications

References 3 publications

Geothermal energy: settlement and water chemistry in Cork, Ireland

Geothermal energy: settlement and water chemistry in Cork, Ireland

The distribution and engineering properties of interglacial deposits in Cork city and harbour

Deep excavations in water-bearing gravels in Cork

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