Dear All,
Below is an announcement of a lecture on Monday
the 9th of March 2009 at Loughborough University,
organised by the ICE East Midlands Geotechnical Group (EMGG):
Date : Monday 9th March 2009, 6.00 for 6.30pm
Subject : "Briars Lane, Hatfield : A holistic approach to chalk mine treatment"
Venue: Room J001, Edward Herbert Building (EHB),
Loughborough University (Map shown at the
following link : http://www.lboro.ac.uk/about/findus.html ).
Light refreshments will be available from 6.00 pm.
Speakers : Chris Milne (Hyder Consulting (UK)
Limited), Andrew O’Donovan (BAM Ritchies
(Division of BAM Nuttall) and John Rigby-Jones (RJM Ground Solutions Limited)
Abstract :
Treatment of abandoned chalk mines beneath
developed areas gives rise to particular
challenges in identifying irregular workings and
validating their successful treatment. These
difficulties are compounded where the very weak nature of the Chalk leads to
the presence of both voids and unstable collapsed
ground. These mixed ground conditions require the
application of a specialised grouting
methodology. As a result of these challenges only
a limited number of such schemes are undertaken
each year in the UK and a systematic approach to
the treatment of chalk mines has yet to be fully developed.
The risk of surface ground movements from chalk
mining in Hatfield has resulted in the
development of new strategies for addressing the
treatment of worked chalk. This treatment has
been undertaken beneath occupied residential
properties and live highway along Briars Lane in
Hatfield. The on-site development of various
treatment methodologies have enabled the efficacy
of different treatment techniques to be assessed
in the presence of extremely varied ground conditions.
Comprehensive monitoring and risk assessment
strategies have been successfully employed to
minimise disruption and evacuation of local
residents. An innovative validation process based
on 3D mine modelling and an integrated data
management system have allowed realtime
assessment of the impacts of treatment works and
progressive re-occupation of properties. The
scheme has therefore allowed a structured
approach to the specification, implementation and validation of chalk mine
treatment methodologies and risk management to be
developed. The presentation summarises the
results of the works, details the methodologies
employed and provides a benchmark for future chalk mine treatment schemes.
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Speakers' Biography :
Chris Milne BSc, MSc, FGS, CGeol, EurGeol
Geotechnical Consultant, Hyder Consulting (UK) Limited, Warrington, UK
www.hyderconsulting.com
A Chartered Geologist and Geotechnical Advisor
with over 20 years experience, including mine
treatment and risk assessment throughout the UK.
Recently he has undertaken risk assessments for
chalk mines in Hatfield, including the
development of strategic advice for development
control tools. He was Hyder’s Project Director
for the design supervision and validation for the
Briars Lane mine treatment scheme.
---------------------------
Andrew O’Donovan MEng
BAM Ritchies (Division of BAM Nuttall), Kent, UK.
www.ritchies.org
Andrew is a Senior Geotechnical Engineer, project
managing the stabilisation works at Briars Lane.
Following his masters in Civil Engineer, Andrew’s
initial career path was as a consultant gaining
experiences in site investigation, foundation and geotechnical
design. The majority of his previous experience
in chalk has been related to the remediation of
tunnels within chalk along the southern coast. He
currently manages Ritchies’ tendering and
contracts in the South East of England.
-----------------------------
John Rigby-Jones BEng, MSc
RJM Ground Solutions Limited, Arnside, UK.
www.rjm-ground.co.uk
John is a Geotechnical Engineer with fifteen
years experience in geotechnical design and site
investigation for a wide variety of projects both
in the UK and overseas. Having spent time
investigating methodologies for locating
dissolution features in chalk at the University
of Surrey he went on to be involved in numerous
chalk related projects in the South East of
England including the design and supervision of
grouting works to the New Medway Bridge
foundations. He provided technical support to
Ritchies for the Briars Lane mine treatment scheme.
If you would like to be on our mailing list,
please send me an e-mail. More information may be
obtained about the various talks at :
http://www.lboro.ac.uk/emgg
Regards,
Ashraf
---------
Dr A. El-Hamalawi BEng, PhD (Cantab), MASCE,MCGS,MILT,PEng
Senior lecturer in Geomechanics
Civil and Building Engineering Department,
Loughborough University,
Loughborough LE11 3TU
United Kingdom
Tel: +44-1509-223206
Fax: +44-1509-223981
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