Evaluation of the Undrained Shear Strength in Preconsolidated Cohesive Soils Based on the Seismic Dilatometer Test
Paweł Galas , Zbigniew Lechowicz , Maria Jolanta Sulewska
AbstractThe 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 (p1 − po)/σ’v 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%.
|Journal series||Applied Sciences-Basel, [Applied Sciences (Switzerland)], ISSN 2076-3417, (N/A 70 pkt)|
|Publication size in sheets||0.90|
|Keywords in English||cohesive soils; undrained shear strength; seismic dilatometer test; statistical analysis|
|ASJC Classification||; ; ; ; ;|
|Internal identifier||ROC 19-20|
|Score||= 70.0, 14-02-2020, ArticleFromJournal|
|Publication indicators||: 2018 = 0.985; : 2018 = 2.217 (2) - 2018=2.287 (5)|
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