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Open AccessArticle

Evaluation of the Undrained Shear Strength in Preconsolidated Cohesive Soils Based on the Seismic Dilatometer Test

1
Faculty of Civil and Environmental Engineering, Warsaw University of Life Sciences–SGGW, Nowoursynowska 159 St., 02-776 Warsaw, Poland
2
Faculty of Civil and Environmental Engineering, Bialystok University of Technology, Wiejska 45E St., 15-351 Bialystok, Poland
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(8), 1660; https://doi.org/10.3390/app9081660
Received: 20 March 2019 / Revised: 15 April 2019 / Accepted: 18 April 2019 / Published: 22 April 2019
(This article belongs to the Section Materials)
The undrained shear strength in cohesive soils can be evaluated based on measurements obtained from the standard dilatometer test (DMT) using single- and multi-factor empirical relationships. However, the empirical relationships presented in the literature may sometimes show relatively high values of the maximum relative error. The add-on seismic module to the seismic dilatometer test (SDMT) extends parameters measurable in a standard dilatometer test by the shear wave velocity Vs as an independent variable. Therefore, a method for evaluating the undrained shear strength in cohesive soils based on data obtained from the seismic dilatometer test is presented in this study. In the method proposed, the two-factor empirical relationship for evaluating the normalized undrained shear strength τfu/σ’v is used based on independent variables: The normalized difference between the corrected second pressure reading and the corrected first pressure reading (p1po)/σv and the normalized shear wave velocity Vs/100. The proposed two-factor empirical relationship provides a more reliable evaluation of the undrained shear strength in the tested Pleistocene and Pliocene clays in comparison to the empirical relationships presented in the literature, with a maximum relative error max RE at about ±20% and the mean relative error RE at about 8%. View Full-Text
Keywords: cohesive soils; undrained shear strength; seismic dilatometer test; statistical analysis cohesive soils; undrained shear strength; seismic dilatometer test; statistical analysis
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MDPI and ACS Style

Galas, P.; Lechowicz, Z.; Sulewska, M.J. Evaluation of the Undrained Shear Strength in Preconsolidated Cohesive Soils Based on the Seismic Dilatometer Test. Appl. Sci. 2019, 9, 1660.

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