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Logging the Chalk [Illustrated] [Hardcover]

Rory N. Mortimore
5.0 out of 5 stars  See all reviews (1 customer review)
Price: £135.00 & FREE Delivery in the UK. Details
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Book Description

19 Aug 2014 1849950989 978-1849950985
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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Product details

  • Hardcover: 352 pages
  • Publisher: Whittles Publishing (19 Aug 2014)
  • Language: English
  • ISBN-10: 1849950989
  • ISBN-13: 978-1849950985
  • Product Dimensions: 28.2 x 21.8 x 2.6 cm
  • Average Customer Review: 5.0 out of 5 stars  See all reviews (1 customer review)
  • Amazon Bestsellers Rank: 383,660 in Books (See Top 100 in Books)

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Product Description

About the Author

Rory N. Mortimore is emeritus professor of engineering geology, University of Brighton, UK; visiting professor of engineering geology, University of Leeds, UK; and director, ChalkRock Limited, Lewes, Sussex, UK.

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Most Helpful Customer Reviews
By Charlie
As a geotechnical engineer based in the south-east of England (particularly London), there are several soil and rock units that I encounter frequently; The Lambeth Group, Thanet Sand, London Clay and Chalk. Chalk is one of the harder units to log for several reasons. Assigning strata boundaries in the chalk can be tough because at first glance the chalk can appear uniform (it is not). Recovery in chalk core can be pretty poor and often a geology degree or eurocode logging course will not cover chalk specifics that are essential for proper detailed logging of the chalk.

This book is (and will be) regarded as the chalk logging bible for any engineering geologist/ geotechnical engineer who encounters chalk in the field as a logging engineer or for people reviewing written logs back in the office. Its steep price genuinely reflects the quality of material within. Of particular use is the large colour annotated photographs of the kinds of things that I could encounter while logging (trace fossils, marker beds, marl seams, various flint types etc). Often core photographs are laid out next to graphic logs of the same sequence as an example of how chalk core can appear in the field.

For those who encounter the chalk in the field, this is the ultimate reference book. Rory Mortimore has visited many ground investigation sites over his career and this is the book people like me have been asking him to write for years.
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