[Geotechnical Engineering]
Peng, Y., Ding, X.*, Xiao, Y., Deng, X., and Deng, W. Detailed amount of particle breakage in non-uniformly graded sands under one-dimensional compression. Canadian Geotechnical Journal, 2019, https://doi.org/10.1139/cgj-2019-0283
Keywords: multi-sized coral sand; impact loading; color grains; absolute particle breakage; breakage index
High Lights:
Quantitatively distinguish the broken and unbroken grains
Detailed particle breakage of granular materials was obtained
Particle breakage indexes excluded the interference effect of size overlap were proposed
Relationships between detailed particle breakage and modes of particle breakage, critical state theory were discussed.
Abstract:
The coexistence of broken and unbroken grains in each size range disturbed the judgement of actual amount of particle breakage. In this study, a series of one-dimensional compression tests were carried out to three kinds of coral sands and a silica sand to clarify the detailed amount of particle breakage for non-uniformly graded sands. Before the compression tests, both coral and silica sand assemblies were divided into different grain-size groups and dyed in different colors, then mixed as non-uniformly graded packings. After the compression, grains of different color in each size range were discerned quantitatively by implementing particle images segmentation on images of grains. Results shown that the extent of particle breakage was found to be larger than the change in relative mass percentage in most size ranges; and the new “absolute particle breakage” wd for each size range satisfied linear relationships with the logarithmic value of compression pressure. Compared with silica sand, coral sand has weaker abrasion under high pressure due to the strong interlock among grains. New breakage indexes of sand samples, based on detailed particle breakage, were proposed. The detailed particle breakage could be useful for proposing breakage-dependent constitutive model of crushable granular soils.
Resource：https://doi.org/10.1139/cgj-2019-0283
