Seafloor Soil Sampling and Geotechnical Parameter Determination - Handbook

摘要

Geotechnical parameters are those seafloor sediment characteristics, such as shear strength or compressibility, that determine how a foundation or anchor will perform. Such characteristics are needed for design and analysis of all fixed seafloor facilities and also for assessment of seafloor penetration and breakout of other objects. This handbook shows the user, who is assumed to be an ocean engineer with little background in soil mechanics, how to obtain measurements of these properties to several different levels of accuracy. A flow diagram identifies the major decision blocks for selecting an appropriate properties determination program. The programs recommended vary from estimation and approximate measurement to coring, detailed laboratory testing, and disturbance correction, depending on the tolerable level of error. The greatest accuracy achievable is a possible error range of plus or minus 20% in shear strength. All aspects of the process of obtaining parameters are described: corers, coring procedures, coring accessories, oceanographic support vessels, core handling, laboratory testing, and test result analysis. Procedures are also given for correcting for coring disturbance in measurement of laboratory shear strengths to estimate the correct in-place strengths. (Author)