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Porosity of bimodal sediment mixture with particle filling

International Journal of Sediment Research 2017年第2期32卷 253-259页

作者： Weiming Wu Wei Li Department of Civil and Environmental Engineering Clarkson University Institute of Coastal and Nearshore Engineering Ocean CollegeZhejiang University

The porosity of a bimodal sediment mixture is affected by the filling of fine particles in the voids of coarse particles when the particle size range is wide.The classical ideal packing models tend to overestimate the filling,and,thus,underestimate the porosity of the mixture.In this study,an existing random filling model is improved by considering a three-dimensional packing configuration,and a new model is developed by considering how many fine particles are required and how many are available to cover the surface of coarse particles in the sediment mixture.The developed models are validated using measured data and compared with existing models.The new model can reproduce well the variation trend of the mixture porosity as the fraction of fine particles varies.

关键词： Bimodal sediment mixture Porosity particle filling particle packing

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Porosity of bimodal and trimodal sediment mixtures

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International Journal of Sediment Research 2022年第2期37卷 258-271页

作者： Chamil Perera Weiming Wu Ian Knack Department of Civil and Environmental Engineering Clarkson University

This study focuses on the prediction of the porosity of nonuniform sediment mixtures,considering the effects of particle packing.A random particle packing model has been developed for the porosity of bimodal mixtures by extending the existing random particle filling theory.Coefficients in the developed model are calibrated by fitting the model to measured data for a variety of bimodal mixtures,including spherical glass particles,rounded quarry grains,and natural sediments.The model coefficients are found to be functions of the diameter ratio of coarse and fine particles,separately for spherical glass particles and natural sediments due to differences in particle shapes.The bimodal mixture model is then extended to trimodal particle mixtures in three approaches:two based on serial packing and one based on random packing.These models are tested against experimental data of six trimodal mixtures with spherical glass beads.The results show that the random packing model and the fine-medium-coarse particle serial packing model predict well the observed trimodal mixture porosities.

关键词： Porosity particle filling particle packing Bimodal mixture Trimodal mixture

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