Data report; Preliminary assessment of Pleistocene sediment strength in the Ursa Basin (Gulf of Mexico continental slope) from triaxial and ring shear test data

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doi: 10.2204/iodp.proc.308.211.2010
Author(s): Meissl, Sandra; Behrmann, Jonas; Behrmann, Jan H.
Integrated Ocean Drilling Program, Expedition 308 Science Party, College Station, TX
Author Affiliation(s): Primary:
IFM-GEOMAR, Kiel, Federal Republic of Germany
Other:
Albert-Ludwigs-Universität Freiburg, Federal Republic of Germany
University of California-Santa Cruz, United States
Lamont-Doherty Earth Observatory, United States
Kyoto University, Japan
University of Tokyo, Japan
Rice University, United States
Lulea University of Technology, Sweden
Universität Bremen, Federal Republic of Germany
Southampton Oceanography Centre, United Kingdom
University of Virginia, United States
Universidad de Granada, Spain
Nanjing University, China
Tongji University, China
Japan Agency for Marine-Earth Science and Technology, Japan
Shell International Exploration and Production, United States
University of Leicester, United Kingdom
Florida State University, United States
University of Tsukuba, Japan
Hokkaido University, Japan
Universitat de Barcelona, Spain
Shizuoka University, Japan
Vrije Universiteit Amsterdam, Netherlands
Volume Title: Proceedings of the Integrated Ocean Drilling Program; Gulf of Mexico hydrogeology; Expedition 308 of the riserless drilling platform from Mobile, Alabama, to Balboa, Panama; Sites U1319-U1324, 30 May-8 July 2005
Volume Author(s): Flemings, Peter B.; Behrmann, Jan H.; John, Cédric M.; Iturrino, Gerardo J.; Aizawa, Yasutaka; Nguyen Thi Thanh Binh; De Silva, Neil; Dugan, Brandon; Edeskar, Tommy M.; Franke, Christine; Gay, Aurélien; Gilhooly, William Patrick, III; Gutierrez-Pastor, Julia; Shao Yongjiang; Li Qianyu; Long, Hui; Moore, J. Casey; Nunoura, Takuro; Pirmez, Carlos; Reichow, Marc; Sawyer, Derek E.; Schneider, Julia; Shumnyk, Anatoliy V.; Suzuki, Takahiro; Takano, Yoshinori; Urgeles, Roger; Yamamoto, Yuzuru; Zampetti, Valentina
Source: Proceedings of the Integrated Ocean Drilling Program; Gulf of Mexico hydrogeology; Expedition 308 of the riserless drilling platform from Mobile, Alabama, to Balboa, Panama; Sites U1319-U1324, 30 May-8 July 2005, Peter B. Flemings, Jan H. Behrmann, Cédric M. John, Gerardo J. Iturrino, Yasutaka Aizawa, Nguyen Thi Thanh Binh, Neil De Silva, Brandon Dugan, Tommy M. Edeskar, Christine Franke, Aurélien Gay, William Patrick Gilhooly, III, Julia Gutierrez-Pastor, Shao Yongjiang, Li Qianyu, Hui Long, J. Casey Moore, Takuro Nunoura, Carlos Pirmez, Marc Reichow, Derek E. Sawyer, Julia Schneider, Anatoliy V. Shumnyk, Takahiro Suzuki, Yoshinori Takano, Roger Urgeles, Yuzuru Yamamoto and Valentina Zampetti; Integrated Ocean Drilling Program, Expedition 308 Science Party, College Station, TX. Proceedings of the Integrated Ocean Drilling Program, Vol.308. Publisher: IODP Management International, Washington, DC, United States. ISSN: 1930-1014
Note: In English. 22 refs.; illus., incl. 2 tables
Summary: We report the preliminary results of a triaxial and ring shear study on clay-rich, fine-grained Pleistocene sediments cored in Ursa Basin, Gulf of Mexico continental slope. Specimens from Integrated Ocean Drilling Program (IODP) Expedition 308 Sites U1322 and U1324 document friction coefficients in the range of 0.13-0.31, with internal angles of friction of ∼7.4°-17.2° in ring shear experiments. At intermediate (7.624 MPa) to high (15.237 MPa) overburden pressure, the majority of the samples tested show velocity weakening, whereas lower overburden pressures do not give a clear trend regarding velocity weakening or strengthening of the samples. In consolidated-undrained triaxial tests, peak shear stresses observed are between 27 and 140 kPa, with the strongest sample by far coming from a core catcher section. We suspect that this is an effect of fabric changes induced during hydraulic piston coring. One sample coming from the base of a mass transport deposit at Site U1322 is the weakest one tested. Young's moduli calculated range from 2 to 17.4 kPa. Stress paths indicate slight overconsolidation of the samples, which is in line with the information gained from preconsolidation stresses in other studies. Permeability determined from consolidation data is in the range of 10-16 to 10-17 m2, and hydraulic conductivity is around 10-9 to 10-10 ms-1. Grain density of the tested samples is around 2.7 g/cm3, and water content ranges from 18.3% to 30.7%.
Year of Publication: 2010
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 30 Engineering Geology; Atlantic Ocean; Boreholes; Cenozoic; Continental slope; Cores; Elastic constants; Expedition 308; Experimental studies; Friction angles; Gulf of Mexico; Hydraulic conductivity; IODP Site U1322; IODP Site U1324; Integrated Ocean Drilling Program; Laboratory studies; Louisiana; Marine sediments; Mechanical properties; North Atlantic; Northern Gulf of Mexico; Permeability; Physical properties; Pleistocene; Pore pressure; Quaternary; Sediments; Shear strength; Shear tests; Soil mechanics; Strain; Stress; Triaxial tests; United States; Ursa Basin; Young's modulus
Coordinates: N280600 N280600 W0890100 W0890200
N280500 N280500 W0890800 W0890800
Record ID: 2010098056
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