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

Roller, S. and Pohl, C. and Behrmann, J. H.
Suyehiro, K. and Sacks, I. S. and Acton, G. D. and Oda, M. (eds.) (2003):
Data report: Triaxial shear strength of sediments and sedimentary rocks from the Japan Trench, ODP Leg 186.
In: Proceedings ODP, Scientific Results, 186 [Online], [Online-Edition: http://www-odp.tamu.edu/publications/186_SR/115/115.htm],
[Book Section]

Abstract

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.

Item Type: Book Section
Erschienen: 2003
Editors: Suyehiro, K. and Sacks, I. S. and Acton, G. D. and Oda, M.
Creators: Roller, S. and Pohl, C. and Behrmann, J. H.
Title: Data report: Triaxial shear strength of sediments and sedimentary rocks from the Japan Trench, ODP Leg 186
Language: English
Abstract:

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.

Title of Book: Proceedings ODP, Scientific Results, 186 [Online]
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Applied Sedimentary Geology
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences
Date Deposited: 28 Jan 2010 13:14
Official URL: http://www-odp.tamu.edu/publications/186_SR/115/115.htm
Identification Number: Ms 186SR-115
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