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Permanent link (DOI): https://doi.org/10.7939/R3W08WH0F

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An approach to evaluation of field CPTU dissipation data in overconsolidated fine-grained soils Open Access

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Author or creator
Sully, J.
Robertson, P. K.
Campanella, R.
Woeller, D.
Additional contributors
Subject/Keyword
Consolidation
Cone penetration test
Clay
Dissipation
Pore pressure
Overconsolidation ratio
In situ
Type of item
Journal Article (Published)
Language
English
Place
Time
Description
Abstract: Dissipation of excess pore pressures during piezocone testing in firm to stiff overconsolidated fine-grained soils provides data curves that cannot be interpreted using published theoretical solutions. Available solutions are based on either cavity-expansion or strain-path methods, which have been developed for soft, normally consolidated soils and do not adequately model the response in overconsolidated soils. During penetration in overconsolidated soils, large pore-pressure gradients and unloading can exist as the soil moves past the singularity at the cone tip shoulder; these gradients modify the initial pore-pressure distribution around the tip and along the friction sleeve and give rise to nonstandard dissipation curves. The different types of response resulting from the modified pore-pressure distribution are discussed and classified and a correction technique is proposed. In this way, the application of available theoretical models can be used to evaluate in situ flow characteristics. Examples of the different types of pore-pressure response are presented from various sites worldwide.
Date created
1999
DOI
doi:10.7939/R3W08WH0F
License information
Rights
© 1999 NRC Research Press (Canadian Science Publishing). This version of this article is open access and can be downloaded and shared. The original author(s) and source must be cited.
Citation for previous publication
Sully, J., Robertson, P., Campanella, R., & Woeller, D. (1999). An approach to evaluation of field CPTU dissipation data in overconsolidated fine-grained soils. Canadian Geotechnical Journal, 36(2), 369-381. DOI: 10.1139/cgj-36-2-369.
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