Interpretation of Cone Penetration Testing in Silty Soils Conducted under Partially Drained Conditions

Rikke Holmsgaard, Benjaminn Nordahl Nielsen, Lars Bo Ibsen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

5 Citationer (Scopus)

Resumé

The standard penetration rate used in cone penetration tests (CPTs) is 20 mm=s, regardless of soil type, which yields fully drained penetration in sand and fully undrained penetration in clay. However, for silty soils that represent an intermediate grain size composition and unique characteristics compared with sand and clay, the standard rate of penetration results in partially drained penetration, often leading to misinterpretation of this soil type. In this study, 15 CPTs, with penetration rates varying from 0.5 to 60 mm=s, were performed at a test site in northern Denmark, where the subsoil consisted primarily of sandy silt with clay bands. The results illustrated that when the penetration rate is reduced, the cone resistance increases, but the pore pressure decreases. The transition between undrained and fully drained penetration was determined by converting the results into a normalized penetration rate. Also evaluated and presented in this paper is how cone resistance obtained under partially drained conditions underestimates the interpreted relative density Dr and friction angle ?. Triaxial test results on undisturbed silt samples were applied for this analysis. © 2015. American Society of Civil Engineers.
OriginalsprogEngelsk
Artikelnummer04015064
TidsskriftJournal of Geotechnical and Geoenvironmental Engineering
Vol/bind142
Udgave nummer1
Antal sider10
ISSN1090-0241
DOI
StatusUdgivet - 2016

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silty soil
Cones
penetration
Soils
Clay
Silt
Testing
Sand
Pore pressure
cone penetration test
clay
soil type
silt
Friction
Engineers
sand
Chemical analysis
triaxial test
subsoil
pore pressure

Emneord

  • Silt
  • Soil testing
  • Cone penetration testing
  • Cone penetration tests
  • Cone resistance
  • Friction angles
  • Grain size composition
  • Partially drained
  • Penetration rates
  • Relative density

Citer dette

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abstract = "The standard penetration rate used in cone penetration tests (CPTs) is 20 mm=s, regardless of soil type, which yields fully drained penetration in sand and fully undrained penetration in clay. However, for silty soils that represent an intermediate grain size composition and unique characteristics compared with sand and clay, the standard rate of penetration results in partially drained penetration, often leading to misinterpretation of this soil type. In this study, 15 CPTs, with penetration rates varying from 0.5 to 60 mm=s, were performed at a test site in northern Denmark, where the subsoil consisted primarily of sandy silt with clay bands. The results illustrated that when the penetration rate is reduced, the cone resistance increases, but the pore pressure decreases. The transition between undrained and fully drained penetration was determined by converting the results into a normalized penetration rate. Also evaluated and presented in this paper is how cone resistance obtained under partially drained conditions underestimates the interpreted relative density Dr and friction angle ?. Triaxial test results on undisturbed silt samples were applied for this analysis. {\circledC} 2015. American Society of Civil Engineers.",
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author = "Rikke Holmsgaard and Nielsen, {Benjaminn Nordahl} and Ibsen, {Lars Bo}",
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Interpretation of Cone Penetration Testing in Silty Soils Conducted under Partially Drained Conditions. / Holmsgaard, Rikke; Nielsen, Benjaminn Nordahl; Ibsen, Lars Bo.

I: Journal of Geotechnical and Geoenvironmental Engineering, Bind 142, Nr. 1, 04015064, 2016.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Interpretation of Cone Penetration Testing in Silty Soils Conducted under Partially Drained Conditions

AU - Holmsgaard, Rikke

AU - Nielsen, Benjaminn Nordahl

AU - Ibsen, Lars Bo

PY - 2016

Y1 - 2016

N2 - The standard penetration rate used in cone penetration tests (CPTs) is 20 mm=s, regardless of soil type, which yields fully drained penetration in sand and fully undrained penetration in clay. However, for silty soils that represent an intermediate grain size composition and unique characteristics compared with sand and clay, the standard rate of penetration results in partially drained penetration, often leading to misinterpretation of this soil type. In this study, 15 CPTs, with penetration rates varying from 0.5 to 60 mm=s, were performed at a test site in northern Denmark, where the subsoil consisted primarily of sandy silt with clay bands. The results illustrated that when the penetration rate is reduced, the cone resistance increases, but the pore pressure decreases. The transition between undrained and fully drained penetration was determined by converting the results into a normalized penetration rate. Also evaluated and presented in this paper is how cone resistance obtained under partially drained conditions underestimates the interpreted relative density Dr and friction angle ?. Triaxial test results on undisturbed silt samples were applied for this analysis. © 2015. American Society of Civil Engineers.

AB - The standard penetration rate used in cone penetration tests (CPTs) is 20 mm=s, regardless of soil type, which yields fully drained penetration in sand and fully undrained penetration in clay. However, for silty soils that represent an intermediate grain size composition and unique characteristics compared with sand and clay, the standard rate of penetration results in partially drained penetration, often leading to misinterpretation of this soil type. In this study, 15 CPTs, with penetration rates varying from 0.5 to 60 mm=s, were performed at a test site in northern Denmark, where the subsoil consisted primarily of sandy silt with clay bands. The results illustrated that when the penetration rate is reduced, the cone resistance increases, but the pore pressure decreases. The transition between undrained and fully drained penetration was determined by converting the results into a normalized penetration rate. Also evaluated and presented in this paper is how cone resistance obtained under partially drained conditions underestimates the interpreted relative density Dr and friction angle ?. Triaxial test results on undisturbed silt samples were applied for this analysis. © 2015. American Society of Civil Engineers.

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