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

@inproceedings{Otsubo:2019:e3sconf/20199214006,
author = {Otsubo, M and Tanu, Dutta T and Durgalian, M and Kuwano, R and O'Sullivan, C},
doi = {e3sconf/20199214006},
pages = {1--5},
publisher = {EDP Sciences},
title = {Particle-scale insight into transitional behaviour of gap-graded materials – small-strain stiffness and frequency response},
url = {http://dx.doi.org/10.1051/e3sconf/20199214006},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - CPAPER
AB  - This study aims to develop a fundamental understanding of the role of fine particles on the small-strain stiffness of gap-graded granular soils. Stiffness was measured using cyclic triaxial probes, which give a measure of static stiffness, and dynamic wave propagation data, from which the dynamic stiffness can be measured. Assemblies of loosely packed spherical particles were considered. In the laboratory, local deformation transducers were used to measure the static stiffness, while the dynamic stiffness was calculated from stress wave velocities, measured using planar piezoelectric elements. To relate the particle-scale responses to the overall soil stiffness, complementary discrete element method (DEM) simulations were performed in which both static and dynamic stiffnesses were measured. Both the laboratory and the DEM data indicate that at low fines contents (< 30%) the stiffness decreases with increasing fines content. When the fines content increases from 30% to 35% there is a sharp increase in stiffness with increasing fines content; this is understood to mark the transition point at which the fines start to contribute significantly to the overall behaviour. Analyses of the frequency domain response of shear wave signals revealed that the lowpass frequency increases significantly at this transition point. This observation can be used to develop experimental interpretation protocols to assess to what extent fines are contributing to the overall soil stiffness.
AU  - Otsubo,M
AU  - Tanu,Dutta T
AU  - Durgalian,M
AU  - Kuwano,R
AU  - O'Sullivan,C
DO  - e3sconf/20199214006
EP  - 5
PB  - EDP Sciences
PY  - 2019///
SP  - 1
TI  - Particle-scale insight into transitional behaviour of gap-graded materials – small-strain stiffness and frequency response
UR  - http://dx.doi.org/10.1051/e3sconf/20199214006
UR  - https://www.e3s-conferences.org/articles/e3sconf/abs/2019/18/e3sconf_isg2019_14006/e3sconf_isg2019_14006.html
UR  - http://hdl.handle.net/10044/1/75577
ER  -
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