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2018 Hanrahan Lecture - free half day seminar

  • Date(s)
    Wednesday, 25 April 2018
  • Time(s)
    From 2:00 PM
  • Venue
    Engineers Ireland, 22 Clyde Road, Dublin 4

About the event

Kindly sponsored by Leca and Irish Tar & Bitumen, this free half day seminar incorporates the following programme:

1. Guest Lecture - 'Small Grains, Big Changes - Characteristics of glacial lake sediments in the Irish Midlands and their role in understanding past and future glaciation' - Dr Cathy Delaney, Senior Lecturer, Manchester Metropolitan University (MMU).

During this segment Dr Cathy Delaney will examine the characteristics of sediments deposited in one proglacial lake, Paleolake Riada, that formed as the margin of the ice sheet retreated westward and downslope from the Shannon-Boyne watershed.  Paleolake Riada was ponded between the watershed, the Slieve Blooms to the south and the ice sheet margin to the north and west.  During the lake’s existence, sediment was discharged into the lake from conduits and channels along the ice margin, resulting in the deposition of extensive glaciolacustrine sediments on the lake floor.  The microscale characteristics of these sediments and their relationship to depositional processes, lake and ice margin characteristics will be discussed, and the implications for reconstructing glacial and meltwater dynamics during deglaciation.  As climate warmed, ice recession resulted in rapid drainage of the lake, followed by changing sedimentation processes and patterns in the lake, including the formation of calcareous marls. The impact of these changes on landscapes and deposits in the Irish Midlands and the global importance of glacial lakes will be discussed.

2. Hanrahan Lecture "Geotechnical Properties of Irish Compressible Soils" - Dr Michael Long , University College Dublin.

This year’s Hanrahan Lecture will be delivered by Dr Michael Long  who will discuss the geotechnical properties of Irish compressible soils.  The objectives of this paper are to provide an update on work done and the development of knowledge on Irish compressible soils since Eamon Hanrahan’s 1979 book on the topic. Eamon sub-divided these soils into three categories namely alluvial, estuarine and lake deposits and he termed them “troublesome soils”. A brief background geology will initially be presented. The complexity of the deposits both on a macro and micro scale will be highlighted. Sites which have been well studied will be summarised and the engineering solutions used to construct on these sites will be reviewed. Although work on these sites presents a significant engineering achievement some important lessons were learned. The remainder of paper deals with how these lessons might be addressed in the future. For example, how can modern ground investigation techniques be used to best characterise these complex deposits and what are the best techniques for examining important detailed aspects of 1D consolidation behaviour such as the identification of the preconsolidation stress, the sometimes rapid rate of consolidation and creep and also how to characterise the undrained shear strength of the soils. The work will be benchmarked against experience of the behaviour of Scandinavian soft soils.

Agenda

2.00pm:  Welcome - Dr David Gill Chartered Engineer, AGL Consulting and Geotechnical Society of Ireland (GSI) Chair

2.05pm:  Guest Lecture - 'Small Grains, Big Changes - Characteristics of glacial lake sediments in the Irish Midlands and their role in understanding past and future glaciation' - Dr Cathy Delaney, Senior Lecturer, Manchester Metropolitan University (MMU)

2.55pm:  GSI Chairperson's Review

3.30pm:  2018 Hanrahan Lecture - "Geotechnical Properties of Irish Compressible Soils" - Dr Michael Long  Chartered Engineer, Associate Professor, University College Dublin (UCD)

5.00pm: Update on RoGEP by Fintan Buggy Chartered Engineer, Roughan O'Donovan

5.10pm: Seminar Close

5.15pm:  Geotechnical Society of Ireland AGM

5.45pm:  AGM Close

About the Speakers

Dr Cathy Delaney is a Senior Lecturer with Manchester Metropolitan University. Her research focuses on glacial, glaciofluvial and glaciolacustrine landforms and sediments in Ireland, the U.K., Iceland and Greenland, using a combination of sedimentological analysis, geophysical surveying and remote sensing (particularly LiDAR).

Dr Michael Long Chartered Engineer, is a lecturer / researcher in geotechnics at UCD since 1996. He is also visiting professor and external examiner at NTNU, Trondheim, Norway. His main research interests comprise the characterisation of natural soils for application in civil engineering works. His current main research effort lies in being leader of the Geotechnics and Geohazards Spoke of the iCRAG research centre based at UCD.  He previously worked with ARUP and ESBI.

Admission

Free and all are welcome to attend. To help us gauge No bookings are required to attend the event. Please use the link provided.

The AGM of the Geotechnical Society will take place immediately after the seminar.

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