東部南海トラフ海底地盤から採取したコア試料の地盤工学的性質

摘要

To produce methane gas from methane hydrate safely and without damaging the environ -ment, we need to address many wide-ranging environmental issues. One is to assess seabed de-formation during methane gas production. We are investigating if deformation of seabed ground occurs during the production of methane gas from methane hydrate. Geotechnical properties of seabed ground have significant effects on deformation behavior. Soil samples were recovered from the East Nankai Trough where there is expected to be a large amount of methane hydrate, based on the extensive distribution and high amplitude BSRs. This paper presents the geotech -nical properties of samples based on the results of laboratory tests. Soil index tests, consolida-tion tests and triaxial compression tests were conducted to obtain the geotechnical parameters that are necessary for a deformation analysis of seabedground in deep seas.