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Title: Piezometer-probe technology for geotechnical investigations in coastal and deep-ocean environments

Abstract

Three multisensor piezometer probes were developed and field tested for use in coastal (shallow water) fine-grained Marine soils. Offshore sites were investigated in the Mississippi Delta. Pore water pressure measurements were determined at several depths below the sea floor using both absolute and differential pressure sensors placed in a four inch diameter probe. Pressure sensors were hard-wired to nearby platforms where signals were conditioned and analog recording devices monitored pore water pressure changes in the marine soils. Pore water pressures were monitored for several months. Two single sensor piezometer probes, eight millimeters in diameter, were developed for deep-ocean investigations. These probes use differential pressure sensors and were tested in a hyperbaric chamber pressurized to 55 MPa (8000 psi). Testing was performed for a period of five weeks under high hydrostatic pressure with the probes inserted in reconstituted illitic marine soil. Small differential pore water pressures responded to both mechanically and thermally generated forcing functions. During shallow water investigations and simulated deep-ocean pressure tests, the sensors exhibited excellent sensitivity and stability. These developments in piezometer probe technology provide a means of assessing important geotechnical parameters of fine-grained seabed deposits.

Authors:
; ; ;
Publication Date:
Research Org.:
Naval Ocean Research and Development Activity, NSTL, MS (USA); Sandia National Labs., Albuquerque, NM (USA)
OSTI Identifier:
5827827
Report Number(s):
SAND-83-0959C; CONF-830639-6
ON: DE83017482
DOE Contract Number:
AC04-76DP00789
Resource Type:
Conference
Resource Relation:
Conference: 12. transducer workshop, Melbourne, FL, USA, 7 Jun 1983; Other Information: Portions are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; PIEZOMETRY; PROBES; CALIBRATION; RELIABILITY; SEA BED; SENSITIVITY; SIMULATION; SOIL MECHANICS; TESTING; MECHANICS; 440300* - Miscellaneous Instruments- (-1989)

Citation Formats

Bennett, R.H., Burns, J.T., Lipkin, J., and Percival, C.M.. Piezometer-probe technology for geotechnical investigations in coastal and deep-ocean environments. United States: N. p., 1983. Web.
Bennett, R.H., Burns, J.T., Lipkin, J., & Percival, C.M.. Piezometer-probe technology for geotechnical investigations in coastal and deep-ocean environments. United States.
Bennett, R.H., Burns, J.T., Lipkin, J., and Percival, C.M.. 1983. "Piezometer-probe technology for geotechnical investigations in coastal and deep-ocean environments". United States. doi:. https://www.osti.gov/servlets/purl/5827827.
@article{osti_5827827,
title = {Piezometer-probe technology for geotechnical investigations in coastal and deep-ocean environments},
author = {Bennett, R.H. and Burns, J.T. and Lipkin, J. and Percival, C.M.},
abstractNote = {Three multisensor piezometer probes were developed and field tested for use in coastal (shallow water) fine-grained Marine soils. Offshore sites were investigated in the Mississippi Delta. Pore water pressure measurements were determined at several depths below the sea floor using both absolute and differential pressure sensors placed in a four inch diameter probe. Pressure sensors were hard-wired to nearby platforms where signals were conditioned and analog recording devices monitored pore water pressure changes in the marine soils. Pore water pressures were monitored for several months. Two single sensor piezometer probes, eight millimeters in diameter, were developed for deep-ocean investigations. These probes use differential pressure sensors and were tested in a hyperbaric chamber pressurized to 55 MPa (8000 psi). Testing was performed for a period of five weeks under high hydrostatic pressure with the probes inserted in reconstituted illitic marine soil. Small differential pore water pressures responded to both mechanically and thermally generated forcing functions. During shallow water investigations and simulated deep-ocean pressure tests, the sensors exhibited excellent sensitivity and stability. These developments in piezometer probe technology provide a means of assessing important geotechnical parameters of fine-grained seabed deposits.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1983,
month = 1
}

Conference:
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