Shear characteristics of nonuniform distribution of granular materials in ring shear test and impact on landslides

Wang SR*, Lu Y, Huang Y, Rafig Azzam.

HighLight

•The difference of particle size distribution in the upper and lower regions of glass microbeads was studied.

• The changes of test parameters under different particle size distributions are analyzed.

• The corresponding mechanism is proposed to explain the movement and parameter change of the sample.

• The motion patterns of glass beads with different particle sizes were recorded by high-definition cameras.

• PIV method was used to track the particle trajectory and demonstrate the velocity displacement.

摘要

Knowledge of the shear behavior of landslide soil is very important for understanding landslide dynamics. This study investigated the shear behavior of base soil particle materials using ring shear tests with glass beads. Samples with varying particle sizes and distributions were examined to explore how particle size affects shear behavior at different shear velocities. Analysis of the samples included assessment of shear stress, displacement–shear stress fluctuations, and changes in the shear stress standard deviation. Results showed that with increasing shear displacement, shear stress fluctuations stabilize. Greater particle size differences lead to more uniform particle mixing and a lower shear stress standard deviation. Conversely, when smaller particles predominate, particle mixing is less uniform, resulting in a higher shear stress standard deviation. Additionally, this study discussed the shear dilation and compaction mechanisms of samples under large displacement shear.

引用格式：

[1] Wang SR*, Lu Y, Huang Y, Rafig Azzam. Shear characteristics of nonuniform distribution of granular materials in ring shear test and impact on landslides [J]. Powder Technology, 2024, 448: 120332

原文链接