Imperial College London
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ProfessorCatherineO'Sullivan

Faculty of Engineering, Department of Civil and Environmental Engineering

Professor of Particulate Soil Mechanics
 
 
 
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Contact

 

+44 (0)20 7594 6117cath.osullivan Website

 
 
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Location

 

501Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Ciantia:2019:10.1007/s11440-019-00802-0,
author = {Ciantia, M and Arroyo, M and O'Sullivan, C and Gens, A},
doi = {10.1007/s11440-019-00802-0},
journal = {Acta Geotechnica},
pages = {1337--1356},
title = {Micromechanical inspection of incremental behaviour of crushable soils},
url = {http://dx.doi.org/10.1007/s11440-019-00802-0},
volume = {14},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - In granular soils grain crushing reduces dilatancy and stress obliquity enhances crushability. These are well-supported specimen-scale experimental observations. In principle those observations should reflect some peculiar micromechanism associated with crushing, but which is it? To answer that question the nature of crushing-induced particle-scale interactions is here investigated using an efficient DEM model of crushable soil. Microstructural measures such as the mechanical coordination number and fabric are examined while performing systematic stress probing on the triaxial plane. Numerical techniques such as parallel and the newly introduced sequential probing enable clear separation of  the micromechanical mechanisms associated with crushing. Particle crushing is shown to reduce fabric anisotropy during incremental loading and to slow fabric change during continuous shearing. On the other hand, increased fabric anisotropy does take more particles closer to breakage. Shear enhanced breakage appears then to be a natural consequence of shear-enhanced fabric anisotropy.  The particle crushing model employed here makes crushing dependent only on particle and contact properties, without any pre-established influence of particle connectivity. That influence does not emerge and it is shown how particle connectivity, per se, is not a  good indicator of crushing likelihood.
AU  - Ciantia,M
AU  - Arroyo,M
AU  - O'Sullivan,C
AU  - Gens,A
DO  - 10.1007/s11440-019-00802-0
EP  - 1356
PY  - 2019///
SN  - 1861-1125
SP  - 1337
TI  - Micromechanical inspection of incremental behaviour of crushable soils
T2  - Acta Geotechnica
UR  - http://dx.doi.org/10.1007/s11440-019-00802-0
UR  - http://hdl.handle.net/10044/1/69880
VL  - 14
ER  -
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