Abstract
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 (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%.
Highlights
In order to determine the geotechnical parameters the cone penetration tests and the standard penetration test (SPT) have wide applications
This paper presents the results of seismic dilatometer tests SDMT and laboratory tests of preconsolidated cohesive soils (Pleistocene clays and Pliocene clays)
The undrained shear strength τfu in cohesive soils from the Ursynów, Bielany, and Stegny sites was determined in CIU triaxial tests on isotropically consolidated samples with shearing in undrained
Summary
In order to determine the geotechnical parameters the cone penetration tests and the standard penetration test (SPT) have wide applications. From in situ tests the cone penetration tests (cone penetration test CPT, cone penetration test with pore pressure measurement CPTU, seismic cone penetration test SCPT) have the widest use for estimating geotechnical parameters over a wide range of materials from very soft soils to weak rock. The flat dilatometer tests (DMT, SDMT) have become popular in many countries for estimating geotechnical parameters in non-cohesive and cohesive soils, their application is low in gravels and soft rocks [1,2]. The flat dilatometer was developed by Marchetti [3,4]. The relationships used to evaluate geotechnical parameters from the dilatometer test such as the corrected first pressure
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