Triaxial shear strength investigations of sediments and sedimentary rocks from the Japan Trench, ODP Leg 186

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doi: 10.2973/odp.proc.sr.186.115.2003
Author(s): Roller, Sybille; Pohl, C.; Behrmann, J. H.
Ocean Drilling Program, Leg 186, Shipboard Scientific Party, College Station, TX
Author Affiliation(s): Primary:
Universität Freiburg, Geologisches Institut, Freiburg, Federal Republic of Germany
Other:
Carnegie Institution of Washington, United States
Ocean Drilling Program, United States
University of Tokyo, Japan
Stockholm University, Sweden
Hokkaido University, Japan
Pukyong National University, South Korea
Florida State University, United States
Indiana State University, United States
University of Edinburgh, United Kingdom
Shizuoka University, Japan
Universität Freiburg, Federal Republic of Germany
Lamont-Doherty Earth Observatory, United States
Volume Title: Proceedings of the Ocean Drilling Program, scientific results, Western Pacific geophysical observatories; covering Leg 186 of the cruises of drilling vessel JOIDES Resolution; Yokohama, Japan, to Yokohama, Japan; sites 1150 and 1151, 14 June-14 August 1999
Volume Author(s): Suyehiro, Kiyoshi; Sacks, I. Selwyn; Acton, Gary D.; Acierno, Michael J.; Araki, Eiichiro; Ask, Maria V. S.; Ikeda, Akihiro; Kanamatsu, Toshiya; Kim, Gil Young; Li, Jingfen; Linde, Alan T.; McWhorter, Paul N.; Mora, Germán; Najman, Yanina M. R.; Niitsuma, Nobuaki; Pandit, Benoy K.; Roller, Sybille; Saito, Saneatsu; Sakamoto, Tatsuhiko; Shinohara, Masanao; Sun, Yue-Feng
Source: Proceedings of the Ocean Drilling Program, scientific results, Western Pacific geophysical observatories; covering Leg 186 of the cruises of drilling vessel JOIDES Resolution; Yokohama, Japan, to Yokohama, Japan; sites 1150 and 1151, 14 June-14 August 1999, Kiyoshi Suyehiro, I. Selwyn Sacks, Gary D. Acton, Michael J. Acierno, Eiichiro Araki, Maria V. S. Ask, Akihiro Ikeda, Toshiya Kanamatsu, Gil Young Kim, Jingfen Li, Alan T. Linde, Paul N. McWhorter, Germán Mora, Yanina M. R. Najman, Nobuaki Niitsuma, Benoy K. Pandit, Sybille Roller, Saneatsu Saito, Tatsuhiko Sakamoto, Masanao Shinohara and Yue-Feng Sun; Ocean Drilling Program, Leg 186, Shipboard Scientific Party, College Station, TX. Proceedings of the Ocean Drilling Program, Scientific Results (CD ROM), Vol.186, 19p. Publisher: Texas A&M University, Ocean Drilling Program, College Station, TX, United States. ISSN: 1096-2514
Note: In English. Data report; available only on CD-ROM in PDF format and on the Web in PDF or HTML. 6 refs.CD-ROM format, ISSN 1096-2514; WWW format, ISSN 1096-7451; illus., incl. 1 table, 4 plates
Summary: In order to determine the shear parameters of the forearc sedimentary strata drilled during Ocean Drilling Program Leg 186, West Pacific Seismic Network, Japan Trench, eight whole-round samples were selected from different depths in the drilled sections of Sites 1150 and 1151. Whereas Site 1150 lays above the seismically active part of the subduction zone, Site 1151 is situated in an aseismic zone. The aim of the triaxial tests was, apart from determination of the static stress strain behavior of the sediments, to test the hypothesis that the static stress strain parameter could differ for each sites. In order to simulate undrained deformation conditions according to the high clay mineral content of the strata, consolidated undrained shear tests were performed in a triaxial testing setup. Measurements of water content, grain density, organic content, and microtextural investigations under the scanning electron microscope (SEM) accompanied the compression experiments. After the saturation and consolidation stages were completed, failure occurred in the compression stage of the experiments at peak strengths of 280-7278 kPa. The stiffness moduli calculated for each sample from differential stress vs. strain curves show a linear relationship with depth and range between 181 and 5827 kPa. Under the SEM, the artificial fault planes of the tested specimen only show partial alignment of clay minerals because of the high content of microfossils.
Year of Publication: 2003
Research Program: ODP Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; 30 Engineering Geology; Compression; Consolidation; Deformation; Experimental studies; Japan Trench; Laboratory studies; Leg 186; Marine sediments; Mechanical properties; North Pacific; Northwest Pacific; ODP Site 1150; ODP Site 1151; Ocean Drilling Program; Pacific Ocean; Rock mechanics; SEM data; Sedimentary rocks; Sediments; Shear strength; Soil mechanics; Strain; Stress; Triaxial tests; West Pacific
Coordinates: N384500 N384500 E1432000 E1432000
N391100 N391100 E1432000 E1432000
Record ID: 2004011527
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