Loading...

Interpretation of CPT in unsaturated sands under drained conditions: A numerical study

Keshmiri, E ; Sharif University of Technology | 2021

453 Viewed
  1. Type of Document: Article
  2. DOI: 10.1002/nag.3284
  3. Publisher: John Wiley and Sons Ltd , 2021
  4. Abstract:
  5. A finite difference-based numerical model simulating the cone penetration process in unsaturated sands is presented. Mohr–Coulomb model (MCM) with simple modifications and Sun model (SM) were implemented to capture the unsaturated sand behaviour. It was shown that the cone tip resistance values resulting from the two models were fairly comparable. Predicted cone tip resistance values in dry, saturated and unsaturated sands using MCM were validated by the results of field and calibration chamber tests. Sensitivity analyses were performed, and the influence of parameters including relative density, mean effective stress and apparent cohesion due to suction on the tip resistance was investigated. Based on a large number of numerical analyses, a simple relationship was suggested to predict the cone tip resistance in dry, saturated and unsaturated sands. The accuracy of the proposed relationship was evaluated by a large database of Cone penetration test (CPT) results performed in various calibration chambers containing different sands. Finally, the applicability of the suggested equation in the estimation of the soil relative density and friction angle from CPT results was shown through useful and practical charts and illustrative examples. © 2021 John Wiley & Sons Ltd
  6. Keywords:
  7. Calibration ; Sand ; Sensitivity analysis ; Condition ; Cone penetration tests ; Cone tip resistance ; Dry sand ; Mohr Coulomb model ; Relative density ; Resistance values ; Saturated sand ; Sun model ; Unsaturated sand ; Numerical models ; Cohesion ; Computer simulation ; Cone penetration test ; Coulomb criterion ; Drained test ; Effective stress ; Finite difference method ; Mathematical analysis ; Mohr theory ; Numerical model
  8. Source: International Journal for Numerical and Analytical Methods in Geomechanics ; Volume 45, Issue 18 , 2021 , Pages 2732-2755 ; 03639061 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/nag.3284