Determination of undrained shear strength and constrained modulus from DMT for stiff overconsolidated clays

Lechowicz, Zbigniew; Rabarijoely, Simon; Kutia, Tetiana

doi:10.1515/sggw-2017-0009

Cited by 4 publications

(5 citation statements)

References 2 publications

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“…The correlations between sounding results and geotechnical parameters require regional determination or adaptation for local conditions [11], [17], [40], [60]. and DMT results for determination of geotechnical parameters (I', cu/Su, Eeod) [5], [6], [15], [17], [26], [27], [30], [40][41][42], [46][47], [61].…”

Section: Methodsmentioning

confidence: 99%

“…Of course, it is recognized that given values require consideration of additional factors, accounting for uncertainty in correlation parameters. Especially, in the case of overconsolidated soils, the impact of stress history plays an important role on evaluation of stiffness characteristic[27],[29]. Some aspects and methodology associated with evaluation of overconsolidated soils (in Polish conditions) can be found in works of Wierzbicki[61].The correlations presented in the article are based of solutions from the literature, therefore widely recognized and already applied in practice, but with additional considerations for local experience so they may be used in the Polish practice with less uncertainty.LIST OF FIGURES AND TABLES:Strain-dependent non-linearity of shear stiffness modulus in light of strain-levels associated with different structure-types and testing methods.Rys.…”

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confidence: 99%

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Evaluation of Stiffness Degradation Curves from in Situ Tests in Various Soil Types

Godlewski

2018

Archives of Civil Engineering

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Increasingly complex design systems require an individual approach when determining the necessary design parameters. As soils are characterized by strong strain-dependent nonlinearity, test methods used to characterize the subsoil should be carefully selected, in terms of their “sensitivity” as well as suitability for the analyzed type of problem. When direct measurements are not available, while design calculation models require specific parameters, indirect parameter estimation may be used. This approach requires calibration and validation of empirical correlations, based on well documented database of tests and case studies. One of the parameters often used, when analyzing soil-structure interaction problems, is the shear stiffness of the soil and its strain-dependent degradation. The aim of the article is to present the procedure for description and evaluation of soil stiffness based on field tests (CPTU, DMT and SDMT) and a large number of reference curves obtained from laboratory tests (TRX) for selected soil types. On the basis of the given algorithm, it is possible to obtain a stiffness module G0 value at any level of deformation, based on in-situ tests.

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Section: Methodsmentioning

confidence: 99%

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confidence: 99%

Evaluation of Stiffness Degradation Curves from in Situ Tests in Various Soil Types

Godlewski

2018

Archives of Civil Engineering

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“…Analysis of DMT and triaxial test results carried out by Lechowicz indicates that, particularly for peat and gyttja, the relationship between the normalized undrained shear strength and the horizontal stress index K D differs from that proposed by Marchetti [20,21] and can be modified as follows [22,23]:…”

Section: Holocene Organic Soilsmentioning

confidence: 96%

Evaluation of deformation and strength parameters of organic soils for the design of geotechnical structures

Lechowicz,

Goławska

2023

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The evaluation of deformation and strength parameters of Holocene organic soils obtained from DMT dilatometer tests based on empirical relationships and ANN Artificial Neural Networks is presented. The evaluation of undrained shear strength τfu, deformation modulus E0.1% and initial shear modulus G0 of Eemian organic soils obtained from DMT dilatometer tests and SDMT seismic dilatometer tests is given, and then its comparison with the values obtained from triaxial tests for the design of underground structures supported by diaphragm walls of the stations of the underground line II in Warsaw, is shown.

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“…Lechowicz et al [51] Pleistocene and Pliocene clays αo = 0.18, α1 = 0.14, α2 = 0.20, α3 = 0.15 Galas [42] (10)…”

Section: Characteristics Of the Tested Cohesive Soilsmentioning

confidence: 99%

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

2019

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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%.

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Determination of undrained shear strength and constrained modulus from DMT for stiff overconsolidated clays

Cited by 4 publications

References 2 publications

Evaluation of Stiffness Degradation Curves from in Situ Tests in Various Soil Types

Evaluation of Stiffness Degradation Curves from in Situ Tests in Various Soil Types

Evaluation of deformation and strength parameters of organic soils for the design of geotechnical structures

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

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