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Data report: strength characteristics of sediments from IODP Expedition 308, Sites U1322 and U13241

Brandon Dugan2 and John T. Germaine3


Triaxial strength experiments completed on specimens from Integrated Ocean Drilling Program Expedition 308 Sites U1322 and U1324 document internal friction angles from 17° to 29° and normalized undrained shear strength from 0.21 to 0.36 at maximum shear. Just prior to undrained shearing, lateral stress ratios for these triaxial specimens range from 0.50 to 0.73. In general, internal friction angle and normalized undrained shear strength decrease with increasing vertical consolidation stress. Lateral stress ratio does not vary systematically with vertical consolidation stress. All 18 specimens in this study were collected with the advanced piston corer (APC). Specimens from Site U1322 were from 27.3–72.9 meters below seafloor (mbsf), and those from Site U1324 were from 89.1–304 mbsf. For each specimen we completed a Ko-consolidated undrained triaxial test to provide data on the stress-strain behavior, undrained shear strength, internal friction angle, and secant modulus. Undrained shearing for each specimen was conducted at a vertical consolidation stress exceeding the hydrostatic vertical effective stress for that specimen.

1 Dugan, B., and Germaine, J.T., 2009. Data report: strength characteristics of sediments from IODP Expedition 308, Sites U1322 and U1324. In Flemings, P.B., Behrmann, J.H., John, C.M., and the Expedition 308 Scientists, Proc. IODP, 308: College Station, TX (Integrated Ocean Drilling Program Management International, Inc.). doi:10.2204/​iodp.proc.308.210.2009

2 Department of Earth Science, Rice University, Houston TX 77005, USA.

3 Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge MA 02139, USA.

Initial receipt: 6 May 2007
Acceptance: 23 July 2008
Web publication: 27 March 2009
MS 308-210