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Logging the Chalk (Hardcover)
Loot Price: R3,787
Discovery Miles 37 870
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Logging the Chalk (Hardcover)
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Chalk has proved to be one of the more difficult rocks to core-log
as it breaks up readily during the drilling process leading to
core-loss and destructuring, particularly where flints, nodular
chalks and/or fractures are present. One of the greatest
difficulties is the identification of chalk engineering grade which
relies heavily on fracture aperture. Obtaining the correct grade to
define the depth of weathering and the depth at which fractures
become closed is essential whether for tunnels in London or for
wind turbine piled foundations in the offshore chalks. Very few
geologists and engineers have had the opportunity to study field
sections in the Chalk so there is little visual appreciation of the
grades or the variation to expect or even what flint bands look
like. To partly overcome this difficulty, both field and core
sections are illustrated in this book. Equally important to
recognising Chalk grade is the building of conceptual ground models
for construction projects. This can only be achieved if the various
Chalk formations, beds and marker beds can be identified from cores
and then boreholes correlated using the marker beds.The Chalk
stratigraphy is accordingly covered with key formations and marker
beds illustrated, and the best field sections for viewing them
identified. This book is based on the standard lithostratigraphy
and method of engineering description of Chalk developed over many
years. Also important are over 3000 onshore and offshore
chalk-cored boreholes undertaken by the author over more than 30
years. In addition, typical lithologies and weathering profiles
representing the Chalk formations likely to be encountered in the
various onshore and offshore construction projects are illustrated
using field exposures, rotary core samples and geophysical borehole
wire-line logs. There will be geological settings where information
on the Chalk is poor and unexpected lithologies and stratigraphies
may be found. This book will enable geologists to work from first
principles to construct a lithostratigraphy and define weathering
boundaries.
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