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

Rikke Holmsgaard, Benjaminn Nordahl Nielsen, Lars Bo Ibsen

Research output: Contribution to journalJournal articleResearchpeer-review

13 Citations (Scopus)

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. © 2015. American Society of Civil Engineers.
Original languageEnglish
Article number04015064
JournalJournal of Geotechnical and Geoenvironmental Engineering
Volume142
Issue number1
Number of pages10
ISSN1090-0241
DOIs
Publication statusPublished - 2016

Keywords

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

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