Shear strength and volume change behavior of binary granular mixtures
Journal
Journal of GeoEngineering
Journal Volume
15
Journal Issue
2
Pages
103-108
Date Issued
2020
Author(s)
Abstract
This study analyzes the compression and shear behavior of binary mixtures through one-dimensional consolidation and direct shear tests. Two particle size ratios of dry binary mixtures, 6.375 (Type A) and 12.070 (Type B), were adopted in the experiments. The relationships between the void ratio and the fines content (FC) of both mixture types were determined. Two deposition methods were applied during the remolding process on specimens with a relative density of 30% to reduce the separation of the coarse and fine particles. The results show that the two deposition methods have no significant effect on the results. Specimens with FC ranging from 15% to 35%, and an FC of 85%, have relatively unstable initial microstructure, and the compression index at FC 25% is higher than that of FC 35% for the same initial void ratio. Fine grains have a dominant effect on the swelling index within the range of FC 50% to 70%. Particle size ratio has a significant effect on volume change but has less effect on shear strength. Similar volume changes were found from the results of both tests. The findings of this study demonstrate that FC 85% exhibits more compressible behavior than FC 70% and 100%, which is unexpected.
Type
journal article