Long coring in deep water for seabled research, gehoazard studies and geotechnical investigations

摘要

The overall objective of the research project is to understand and predict seabed processes on the continental slpe in the northwest Gulf of Mexico, related to the regional geology and engineering properties for the design of sealfoor installations. This paper is a report of work in progress with a focus on a one-month research cruise to the main study corrideor in deep water (800-2700 m W.D.), during which over, 1,000 meters of sediment samples were obtained woith a large-diameter long piston coring system and a large-diameter gravity corer. Profles obtained from logging of the cores exhibit the wide range of variability associated with laminated soft sediments; debirs flows, tubidity currents, and overconsolidated sediments, There is very good agreement between long core shear strepngth results and coventional boring data at two floating platform sites, Auger and Jolliet.