Defining the yield envelope of claystone from 1.1 km depth in Ocean Drilling Program Site 1151, Japan Trench

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In this thesis the yield envelope of a claystone from Ocean Drilling Program (ODP) Site 1151 is explored from a range of laboratory tests on undisturbed core samples. The claystone samples tested were obtained from a depth of about 1.1 km below the seafloor, landward of the Japan Trench. During this Ocean Drilling Program (ODP), Leg 186 in the Japan Trench a geophysical observatory consisting of two seismometers, one tiltmeter and one strainmeter was permanently installed at a depth of 1084 to 1095 meters below seafloor (mbsf) near the base of Hole 1151B to investigate the occurrence of silent earthquakes at this portion of the subduction zone. This study provides information of the effective yield stress and mechanical behaviour of sediments near the depth of geophysical observatory. The analysis of the mechanical properties of these cores will provide insights on the deformation processes that occur in this subduction zone particularly the forearc of the Japan Trench. Ask and Kopf (2004) conducted an earlier study in which the physical and mechanical properties of sediments from Sites 1150 and 1151 were analysed and compared. Besides the yield envelope other mechanical properties of the claystone such as the Young's modulus, the bulk modulus and the effective yield stress were also investigated and obtained. The knowledge of the yield envelope and the mechanical properties f...