Use of discrete element modeling to study the stress and strain distribution in cyclic torsional shear tests

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F17%3A43915088" target="_blank" >RIV/60461373:22340/17:43915088 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1007/s11440-017-0526-4" target="_blank" >https://link.springer.com/article/10.1007/s11440-017-0526-4</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11440-017-0526-4" target="_blank" >10.1007/s11440-017-0526-4</a>

Result language

angličtina

Original language name

Use of discrete element modeling to study the stress and strain distribution in cyclic torsional shear tests

Original language description

In this research, a torsional cyclic shear test was modeled using the 3D discrete element method (DEM). The results are compared against experimental data and micro-mechanical aspects of the soil during the loading are discussed. The aim of the work is to study the homogeneity of strains during this laboratory test and to compare the micro-mechanical behavior of the soil sample for different strain levels. The experimental investigation was performed using a synthetic soil material made of glass beads, which simplifies the modeling and calibration since normal interaction forces do not induce rotation of the particles. Both the model and experimental tests used the same grading distribution and particle size. We showed that the hysteresis cycles can be properly reproduced in terms of shape and magnitude. Thus, we obtained a robust estimation for the secant shear modulus and damping ratio at different strain levels. With this, it was possible to build stiffness degradation and damping increase curve to compare it with experimental data obtained from torsional shear tests. Based on this validation of the DEM model, we discuss the micro-mechanical behavior of the soil and its relation with the macroscopic parameters obtained. It is shown that shear strain distribution on the sample is not uniform and that large values of strains concentrate close to the top of the sample as top rotation increases, which differs from the standard assumption of a constant value across the height of the sample. Additionally, it is observed that at 0.8 times radius, the cumulative torque reaches approximately 90% of the total torque applied to sample.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20401 - Chemical engineering (plants, products)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

ACTA GEOTECHNICA

ISSN

1861-1125

e-ISSN

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Volume of the periodical

12

Issue of the periodical within the volume

3

Country of publishing house

DE - GERMANY

Number of pages

16

Pages from-to

511-526

UT code for WoS article

000401559800004

EID of the result in the Scopus database

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