Magnetic measurement system of sandy gravel specimens shape during tests in a large triaxial apparatus

Ventini, Roberta; Flora, Alessandro; Lirer, Stefania; Mancuso, Claudio

doi:10.1051/e3sconf/20199202004

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…Particle shape and size determine the phenomenon and degree of sand damage [15]. Circular sand particles are less likely to break than irregular sand particles due to their lower stress concentration [16]. The probability of breaking small particles is smaller than that of breaking large particles, because the breaking of small particles requires more energy.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Dynamic Compressive Behaviors of Sand under Passive Confining Pressure

Kou

Zhang

et al. 2022

Materials

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Dynamic compressive tests of sand under passive confining pressure were carried out using a Split Hopkinson Pressure Bar (SHPB) setup. The dynamic response, energy dissipation and particle-breaking behaviors of sand subjected to high-speed impact were investigated. Sand specimens with moisture contents of 0%, 2%, 4%, 8%, 10% and 12% and relative densities of 0.1, 0.5 and 0.9 were prepared. The variation in the strain rate was controlled between 90 s−1 and 500 s−1. The specimens were confined in a designed sleeve to create passive confining pressure. The experimental results show that the sand specimens were extremely sensitive to the strain rate. When the strain rate was less than 400 s−1, the stress and strain of the specimens increased with the increase in the strain rate but decreased when the strain rate exceeded 400 s−1. The peak strain and peak stress increased with the increase in the relative density. Particle breakage was aggravated with the strain-rate increase. Compared with the specimen without water, the relative breakage rate of the specimen with a moisture content of 12% decreased by 30.53% when the strain rate was about 95 s−1 and by 25.44% when the strain rate was about 460 s−1. The analysis of energy dissipation revealed the essential cause of sand destruction. The specific energy absorption rate increased with the increases in the initial relative density and moisture content.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Dynamic Compressive Behaviors of Sand under Passive Confining Pressure

Kou

Zhang

et al. 2022

Materials

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Influence of particle crushing on the critical state line of rockfill materials

Ventini,

Lirer,

Flora

et al. 2024

E3S Web of Conf.

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The mechanical behaviour of rockfill materials is strongly affected by particle breakage, which causes a continuous variation of the grain size distribution (GSD) until a stationary condition. Although the evolution of grain crushing caused among others by the initial grading, the relative density and stress level has been extensively studied, the relationship describing the influence of the current GSD on other soil properties such as the critical state line is not uniquely defined. In this study, a series of triaxial compression tests with various stress paths under monotonic loading were performed on a rockfill to examine the effect of particle breakage on the position of the critical state lines (CSLs) in the compression plane. Specimens were prepared with the same initial grading and relative density to investigate the evolution of the GSD as a result of grain breakage determined by different stress paths applied in a large triaxial apparatus. In addition, a recently proposed simplified procedure is employed to capture the evolution of the CSLs of the tested crushable rockfill as a function of a breakage parameter related to the breakage index Bg. Experimental results obtained for the tested rockfill demonstrate that the abovementioned procedure is capable to predict the position of the CSL linked to the GSD reached at the end of the triaxial test, also when the critical state condition, defined as the ultimate condition in which shearing could continue indefinitely without changes in volume or effective stresses, is not reached.

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Magnetic measurement system of sandy gravel specimens shape during tests in a large triaxial apparatus

Cited by 2 publications

References 5 publications

Experimental Study on Dynamic Compressive Behaviors of Sand under Passive Confining Pressure

Experimental Study on Dynamic Compressive Behaviors of Sand under Passive Confining Pressure

Influence of particle crushing on the critical state line of rockfill materials

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