Using Piezocone Dissipation Test to Estimate the Undrained Shear Strength (su), Nkt and NΔu Factors in Cohesive Soils - Journal of Geoscience and Environment Protection

GEP > Vol.7 No.8, August 2019

Using Piezocone Dissipation Test to Estimate the Undrained Shear Strength (s_u), N_kt and N_Δu Factors in Cohesive Soils ()

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DOI: 10.4236/gep.2019.78007 583 Downloads 1,545 Views

Author(s)

Dante René Bosch¹, Rubén Rafael Sotelo¹, Fernando María Mántaras²

Affiliation(s)

¹Center of Applied Geosciences, Faculty of Engineering, UNNE (National University of Northeast), Resistencia, Chaco, Argentina.
²Geoforma Engenharia Ltda, Joinville, Brazil.

ABSTRACT

The current practice of geotechnical engineering commonly uses a combination of theoretical and empirical correlations to estimate the soil undrained shear strength in clays from the piezocone test. In order to complement the use of such correlations, the application of a method to estimate the soil undrained shear strength, using measures of the excess pore pressure in dissipation tests of piezocone is presented. In cohesive soils, excess pore pressure and undrained shear strength are dependent on the same variables (stress state, stress history, soil stiffness), which allows them to be related by the theoretical cavity expansion-critical state framework. This paper mentions the mathematical formulation that supports the theoretical framework used, its relationship with the N_kt and N_Δu factors and their estimation in a case studied. The results obtained are consistent within the dispersion found in the international literature and encourage the use of the method in engineering practice.

KEYWORDS

CPTu Piezocone, Overconsolidation Ratio, Undrained Shear Strength, Dissipation Test

Share and Cite:

Bosch, D. , Sotelo, R. and Mántaras, F. (2019) Using Piezocone Dissipation Test to Estimate the Undrained Shear Strength (s_u), N_kt and N_Δu Factors in Cohesive Soils. Journal of Geoscience and Environment Protection, 7, 96-104. doi: 10.4236/gep.2019.78007.

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