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Static and dynamic Young's moduli of chalk from the North Sea

Casper Olsen, Helle Foged Christensen and Ida Lykke Fabricius
Static and dynamic Young's moduli of chalk from the North Sea
Geophysics (March 2008) 73 (2): E41-E50

Abstract

We present results from a study of dynamic and static Young's moduli of North Sea chalk based on laboratory tests on both dry and water-saturated chalk. We obtained static moduli by using both strain gauge and linear voltage displacement transducer (LVDT) measurements. We investigated the influence of pore fluid on static and dynamic Young's moduli and evaluated the two methods for obtaining static Young's modulus. We obtained good agreement between dynamic and static Young's moduli from strain gauge measurements on dry chalk, but for water-saturated chalk the dynamic Young"s modulus was larger than the measured static Young's modulus. This difference may be caused in part by the influence of the difference in frequencies of static and dynamic measurements. Another reason for the observed difference may be a practical experimental problem that causes the measured static Young's modulus for water-saturated chalk to be lower than the true modulus. When we compared dynamic Young's modulus for dry chalk with that for water-saturated chalk, the dry modulus was larger than the water-saturated modulus, probably owing to shear weakening of the chalk. Young's modulus from LVDT measurements does not relate to dynamic Young's modulus for dry or water-saturated rock because the LVDT is not able to accurately measure the small deformations of the samples during loading at relatively low stresses.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 73
Serial Issue: 2
Title: Static and dynamic Young's moduli of chalk from the North Sea
Affiliation: Technical University of Denmark, Department of Environment and Resources, Lyngby, Denmark
Pages: E41-E50
Published: 200803
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 31
Accession Number: 2008-080666
Categories: Engineering geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendices
Illustration Description: illus. incl. 5 tables
N51°00'00" - N61°10'00", W04°00'00" - E11°00'00"
Secondary Affiliation: Danish Geotechnical Institute, DNK, Denmark
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 200823
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