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Book Chapter

Geotechnical Applications in Soft Sediments

By
Wayne A. Dunlap
Wayne A. Dunlap
Texas A & M University
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Published:
January 01, 1981

Abstract

It is the purpose of this portion of the short course to consider some of the quantitative aspects of geologic hazards in soft sediments. The landmark work by Coleman, Garrison, Prior and others in the Mississippi Delta has certainly shown that there can be major subbottom movements in soft sediments. However, this is not recent news. Shepard in 1955 concluded from bathymetric surveys that subaqueous slides occurred in the prodelta sediments of the Mississippi River. Later, Terzaghi (1956) provided a remarkably accurate engineering explanation for many of these slides. An added dimension was provided by Henkel (1970) regarding the role of storm waves in producing slides. But the recent painstaking and detailed research described at this short course by Coleman and Prior provides for the first time a complete description of the processes involved, the resulting morphology, and even some consideration of frequency of subbottom movements. Offshore platform and marine pipeline designers now have a relatively clear understanding of the problems they are facing, in-so-far as bottom movements are concerned. In light of the present fund of knowledge, it is probably not correct to consider these movements as “hazards.” Rather, they should be considered as design constraints, just as the structural steel designer considers the yield strength of steel as a constraint in his designs, not as a hazard.

Although recognition of the problem is a major step towards solution, a structure cannot be designed based on geological considerations alone. The remainder of this paper will consider geotechnical design aspects

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Contents

AAPG Continuing Education Course Notes Series

Offshore Geologic Hazards: A Short Course Presented at Rice University, May 2-3, 1981 for the Offshore Technology Conference

Arnold Bouma
Arnold Bouma
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Dwight Sangrey
Dwight Sangrey
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James Coleman
James Coleman
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David Prior
David Prior
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Anita Trippet
Anita Trippet
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Wayne Dunlap
Wayne Dunlap
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James Hooper
James Hooper
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American Association of Petroleum Geologists
Volume
18
ISBN electronic:
9781629812618
Publication date:
January 01, 1981

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