A parkable piezoprobe for measuring cv at shallow depths for offshore design
A parkable piezoprobe for measuring cv at shallow depths for offshore design
The coefficient of consolidation (cv) at shallow depth is an important parameter for the design of many offshore facilities, particularly pipelines. This paper sets out the concept, operation and interpretation of a new simple tool for measuring cv in situ at shallow depths. This tool is a large cylindrical penetrometer with a hemispherical tip, which is embedded statically under self-weight, for example from a winch. After embedment, the tool is 'parked' - not requiring support from a drill-string - and the pore pressure dissipation is monitored. This 'parkable' feature allows the tool to be added to conventional drilling or penetrometer systems and used in parallel. The operation of the tool has been simulated using large-deformation finite-element analysis with the Cam Clay plasticity soil model. Results in the form of the normalised undrained penetration response and pore water pressure dissipation-time history are presented. The penetration response indicates the weight requirement of the device. The dissipation curves allow cv to be determined from field measurements of pore pressure.
Clays, Consolidation, In situ testing, Offshore engineering
83-88
Chatterjee, S.
0fdc4643-ca7d-42a3-9ea9-2c95047b8fbb
Randolph, M.F.
75caa33a-e630-4ae8-84cd-758797bf9633
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
January 2014
Chatterjee, S.
0fdc4643-ca7d-42a3-9ea9-2c95047b8fbb
Randolph, M.F.
75caa33a-e630-4ae8-84cd-758797bf9633
White, D.J.
a986033d-d26d-4419-a3f3-20dc54efce93
Chatterjee, S., Randolph, M.F. and White, D.J.
(2014)
A parkable piezoprobe for measuring cv at shallow depths for offshore design.
Geotechnique, 64 (1), .
(doi:10.1680/geot.13.T.008).
Abstract
The coefficient of consolidation (cv) at shallow depth is an important parameter for the design of many offshore facilities, particularly pipelines. This paper sets out the concept, operation and interpretation of a new simple tool for measuring cv in situ at shallow depths. This tool is a large cylindrical penetrometer with a hemispherical tip, which is embedded statically under self-weight, for example from a winch. After embedment, the tool is 'parked' - not requiring support from a drill-string - and the pore pressure dissipation is monitored. This 'parkable' feature allows the tool to be added to conventional drilling or penetrometer systems and used in parallel. The operation of the tool has been simulated using large-deformation finite-element analysis with the Cam Clay plasticity soil model. Results in the form of the normalised undrained penetration response and pore water pressure dissipation-time history are presented. The penetration response indicates the weight requirement of the device. The dissipation curves allow cv to be determined from field measurements of pore pressure.
This record has no associated files available for download.
More information
Published date: January 2014
Keywords:
Clays, Consolidation, In situ testing, Offshore engineering
Identifiers
Local EPrints ID: 419761
URI: http://eprints.soton.ac.uk/id/eprint/419761
ISSN: 0016-8505
PURE UUID: bdf8f586-ad04-4cd1-9373-35c112e7cf17
Catalogue record
Date deposited: 20 Apr 2018 16:30
Last modified: 16 Mar 2024 04:32
Export record
Altmetrics
Contributors
Author:
S. Chatterjee
Author:
M.F. Randolph
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics
