Repetitive Compression Tests on a Carbonate Sand

Miao, Guien; Airey, David

doi:10.1007/978-3-319-13506-9_53

Cited by 1 publication

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“…Particle crushing increases with particle angularity and the median particle size in one-dimensional compression tests (Hagerty et al, 1993). An ultimate gradingpossibly dependent on stress history (Miao & Airey, 2015) is thought to exist under very large compression (Hagerty et al, 1993). Experimental studies suggest the existence of an ultimate grading after large shear strains as well (Coop et al, 2004), which depends on normal stress and initial grading.…”

Section: Introductionmentioning

confidence: 99%

Particle shape factors and fractal dimension after large shear strains in carbonate sand

Zhang

Scaringi

et al. 2018

Géotechnique Letters

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Changes of grain shape and breakage under compression and shearing can affect the mechanical properties of granular soils. In this work, a parametric study was performed through ring-shear tests on carbonate sand, under σ n = 600 kPa and v = 6 mm/min, to evaluate the evolution of particle breakage, fractal dimension and particle shape with the shear strain. Breakage mostly occurred for γ ≤ 4000%, with a consequent increase in fractal dimension. Under larger strains, only negligible breakage occurred, while the particles became more rounded, and the fractal dimension increased only slightly. Interestingly, the shape factors also tend towards similar values for particles of any size larger than 0•063 mm after large shearing. This indicates that these particles tend towards a self-similar formand hence scale invariancewhen the grading reaches a fractal particle size distribution. Some tests were also performed on soils with different median size and coefficient of uniformity, which showed that larger particles and poorly graded soils are more prone to breakage, and are closer to a fractal distribution after shearing. Conversely, the final particle shape did not seem to be affected by grading and size significantly.

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