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2020 | OriginalPaper | Buchkapitel

State-Dependent Dilatancy of Soils: Experimental Evidence and Constitutive Modeling

verfasst von : Merita Tafili, Theodoros Triantafyllidis

Erschienen in: Recent Developments of Soil Mechanics and Geotechnics in Theory and Practice

Verlag: Springer International Publishing

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Abstract

This work provides a new evaluation method of the dilatancy for cohesive soils from monotonic and cyclic undrained triaxial tests. Herein it is implemented for experiments performed on Kaolin. Leastwise for this soft soil the dilatancy turns out to be a function of the stress ratio \(\eta \) and the void ratio e along with the intrinsic material parameters. Furthermore, an OCR-definition, which includes the influence of both the stress ratio and void ratio such that \(d = f(\mathrm{OCR},C)\) with C being a set of inherent parameters is proposed. In addition based on the experimental observations it is suggested that there is an overconsolidation ratio \(\text {OCR}_{ci}\) at which the soft soil behaviour changes from contractant in case of \(\text {OCR}<\text {OCR}_{ci}\) to dilatant (the material can both contract and dilate depending on \(\eta \)) in case of \(\text {OCR}>\text {OCR}_{ci}\) with the PTL lying below the CSL in this case. Finally, a constitutive relation describing the behaviour of soft soils including the dilatancy and viscosity is proposed. Some simulations of monotonic as well as cyclic tests are shown to prove the accurate performance of the model.

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Vorheriges Kapitel Geomechanical Influences of Interface Dilatancy
Nächstes Kapitel On FE Modeling of Two-Phase Media Using the up-Discretization
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Fußnoten
1
Taylor in 1954 [3], pp. 345–347.
 
2
Note the equality \(\dot{\sqcup }=d\sqcup /dt\).
 
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Metadaten
Titel
State-Dependent Dilatancy of Soils: Experimental Evidence and Constitutive Modeling
verfasst von
Merita Tafili
Theodoros Triantafyllidis
Copyright-Jahr
2020
Buch
Recent Developments of Soil Mechanics and Geotechnics in Theory and Practice

Print ISBN: 978-3-030-28515-9

Electronic ISBN: 978-3-030-28516-6

Copyright-Jahr: 2020

DOI
https://doi.org/10.1007/978-3-030-28516-6_4

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