Abstract
A free-fall piezometer (Pop Up Pore Pressure Instrument, PUPPI) has been developed to measure excess pore pressures in seabed sediments. The instrument is capable of operating in water depths of up to 6000 m for a period of one year. Excess pore pressure is measured with a resolution of 0.05 KPa at a port located near the tip of a 4 m long lance. The pressure caused by insertion, the insertion pressure decay curve and any residual (ambient) excess pressure can be used to assess some of the geotechnical properties of in-situ sediments. The acoustic, mechanical, and electronic systems of the PUPPI are described, and examples from deployments into soft sediments in oceanic depths are presented.
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© 1986 Society for Underwater Technology
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McPhail, S.D., Schultheiss, P.J. (1986). PUPPI — A free-fall Seabed Piezometer for Geotechnical Studies. In: Oceanology. Advances in Underwater Technology, Ocean Science and Offshore Engineering, vol 6. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4205-9_30
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DOI: https://doi.org/10.1007/978-94-009-4205-9_30
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-8366-9
Online ISBN: 978-94-009-4205-9
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