Chalk has proved to be one of the more difficult rocks to corelog 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 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 recognizing 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 3,000 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 both field exposures, rotary core samples, and geophysical borehole wire-line logs.
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Author(s)/Editor(s): John C. Lorenz and Scott P. Cooper | Size: 35 MB | Format:PDF | Quality:Unspecified | Publisher: Wiley-Blackwell | Year: 2017 | pages: 328 | ISBN: 9781119160007
Atlas of Natural and Induced Fractures in Core offers a reference for the interpretation of natural and induced fractures in cores. The natural and induced fracture data contained in cores provides a wealth of information once they are recognized and properly interpreted. Written by two experts in the field, this resource provides a much-needed tool to help with the accurate interpretation of these cores.
The authors include the information needed to identify different fracture types as well as the criteria for distinguishing between the types of fractures. The atlas shows how to recognize non-fracture artefacts in a core since many of them provide other types of useful information. In addition, the text's illustrated structures combined with their basic interpretations are designed to be primary building blocks of a complete fracture assessment and analysis. The authors show how to recognize and correctly interpret these building blocks to ensure that subsequent analyses, interpretations, and modeling efforts regarding fracture-controlled reservoir permeability are valid.
Presented in full color throughout, this comprehensive reference is written for geologists charged with interpreting fracture-controlled permeability systems in reservoirs as well as for students or other scientists who need to develop the skills to accurately interpret the natural and induced fractures in cores.
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Article/eBook Full Name: A simple method for detecting cracks in soil-cement reinforcement for centrifuge modelling
Author(s): Shuji Tamura, Mohammad Khosravi, Daniel Wilson, Deepak Rayamajhi, Ross W. Boulanger, C. Guney Olgun, Yongzhi Wang
Publish Date: 2018
ISBN: 1346-213X
Published By: International Journal of Physical Modelling in Geotechnics
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The main aims of this book are to provide an understanding of the nature of soil, an appreciation of soil behaviour and a concise and clear presentation of the basic principles of soil mechanics.
The subject of soil mechanics attempts to provide a framework for understanding the behaviour of the ground by considering the principles which apply to soils. The geotechnical engineer must then use judgement to determine how to apply these principles in real situations.
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