Imperial College London
Alternate

Dr J Antonio H Carraro

Faculty of Engineering, Department of Civil and Environmental Engineering

Honorary Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 6038antonio.carraro Website

 
 
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Location

 

528BSkempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Liu:2022:10.1061/(ASCE)GT.1943-5606.0002902,
author = {Liu, D and O'Sullivan, C and Harb, Carraro JA},
doi = {10.1061/(ASCE)GT.1943-5606.0002902},
journal = {Journal of Geotechnical and Geoenvironmental Engineering},
title = {Use of combined static and dynamic testing to quantify the participation of particles in stress transmission},
url = {http://dx.doi.org/10.1061/(ASCE)GT.1943-5606.0002902},
volume = {148},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A number of research studies have recognised that not all particles in a sand specimen are active in stress transmission, particularly in the case of gap-graded soils. This has implications for the use of the global void ratio (e), and variables/parameters that depend upon e, to predict the influence of the state on the mechanical behaviour of gap-graded soils. This study explores the possibility of comparing the shear stiffness determined in dynamic wave propagation tests (G_dyn) with stiffness values determined in small-strain probes (G_sta) to assess the extent to which all the particles in a specimen are actively engaged in stress transmission. The idea is initially developed using three-dimensional discrete element method simulations and considering ideal specimens. The practical application of this approach is then tested in a series of drained triaxial compression tests. The numerical studies considered both specimens with continuous, linear particle size distributions as well as gap-graded soils. The results show that the ratio G_sta/G_dyn may be associated with the ratio between the bulk density calculated considering only the stress transmitting particles, ρ_m, and the bulk density calculated considering all the particles, ρ. The ratio ρ_m/ρ is determined by the proportion of inactive particles, which varies with the proportion by mass of finer particles in the soil (F_finer) for gap-graded soils. The relationship between G_sta/G_dyn (e) and F_finer enables a qualitative assessment of the proportion of inactive particles. The corresponding experimental test results show a similar but weaker correlation between the ratio of G_sta/G_dyn and F_finer, this weaker correlation may be attributed to the differences between the simulations and the experimental conditions. However, despite the challenges with experimental implementation, the data presented here support the idea that it may be possible to qualitatively estimate the proportion by volum
AU  - Liu,D
AU  - O'Sullivan,C
AU  - Harb,Carraro JA
DO  - 10.1061/(ASCE)GT.1943-5606.0002902
PY  - 2022///
SN  - 0733-9410
TI  - Use of combined static and dynamic testing to quantify the participation of particles in stress transmission
T2  - Journal of Geotechnical and Geoenvironmental Engineering
UR  - http://dx.doi.org/10.1061/(ASCE)GT.1943-5606.0002902
UR  - http://hdl.handle.net/10044/1/97628
VL  - 148
ER  -
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