FN Archimer Export Format
PT J
TI Shallow Seafloor Sediments: Density and Shear Wave Velocity
BT 
AF Salva Ramirez, Marisol
   Park, Junghee
   Terzariol, Marco
   Jiang, Jiming
   Santamarina, J. Carlos
AS 1:1;2:2;3:3;4:4;5:5;
FF 1:;2:;3:PDG-REM-GEOOCEAN-ALMA;4:;5:;
C1 Postdoctoral Fellow, Earth Science and Engineering, King Abdullah Univ. of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
   Assistant Professor, Dept. of Civil and Environmental Engineering, Incheon National Univ., 119 Academy-ro, Yeonsu-gu, Incheon 22012, South Korea
   Research Scientist, Institut français de recherche pour l’exploitation de la mer (IFREMER), Marine Geosciences, Plouzane 29280, France
   Research Scientist, CU Beijing Lighting Equipment Co., Ltd., 240 Huixinli Chaoyang District, Beijing 100029, China; formerly, King Abdullah Univ. of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
   Professor, Earth Science and Engineering, King Abdullah Univ. of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
C2 UNIV KING ABDULLAH KAUST, SAUDI ARABIA
   UNIV NATL INCHEON, SOUTH KOREA
   IFREMER, FRANCE
   BEIJING CU LIGHTING CO, SAUDI ARABIA
   UNIV KING ABDULLAH KAUST, SAUDI ARABIA
SI BREST
SE PDG-REM-GEOOCEAN-ALMA
UM GEO-OCEAN
IN WOS Ifremer UMR
   copubli-int-hors-europe
IF 3.9
TC 4
UR https://archimer.ifremer.fr/doc/00828/93971/100784.pdf
   https://archimer.ifremer.fr/doc/00828/93971/100785.pdf
LA English
DT Article
DE ;Offshore geotechnics;Compressibility;Coefficient of consolidation;Excess pore-water pressure;In-situ testing
AB Near-surface seafloor properties affect offshore mining and infrastructure engineering. Shallow seafloor sediments experience extremely low effective stress, and consequently, these sediments exhibit very low in-situ density, shear wave velocity, and shear stiffness. We combined data extracted from the literature with new laboratory and field results to develop a comprehensive understanding of shallow seafloor sediments. First, we explored the sediment-dependent self-compaction characteristics starting with the asymptotic void ratio at the interface between the water column and the sediment column. The asymptotic void ratio depends on the particle size and shape in coarse-grained sediments and on mineralogy and pore fluid chemistry in fine-grained clayey sediments; overall, the asymptotic void ratio correlates with the sediment-specific surface and compressibility. Second, we developed a fork-type insertion probe to measure shear wave velocity profiles with depth. Detailed data analyses confirm the prevalent role of effective stress on shear wave velocity Vs=α(σ′m/kPa)β, and the inverse relationship between α and β parameters reveals that electrical interactions alter the velocity profile only in very high specific surface area sediments at very low effective stress and shows that ray bending affects the computed velocities only in the upper few centimeters (for the probe geometry used in this study). Probe insertion causes excess pore fluid pressure and effective stress changes; the ensuing time-dependent diffusion detected through shear wave velocity changes can be analyzed to estimate the coefficient of consolidation. Shear wave velocity profiles and velocity transients after insertion provide valuable information for sediment preclassification and engineering design.   
PY 2023
PD MAY
SO Journal Of Geotechnical And Geoenvironmental Engineering
SN 1090-0241
PU American Society of Civil Engineers (ASCE)
VL 149
IS 5
UT 000952247300019
DI 10.1061/JGGEFK.GTENG-10759
ID 93971
ER

EF