The effec of grain sphericity and roundness on critical state parameters

Date

2024-9

Author

Aksoy, Ahmet Seyit

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In this research study, the critical state parameters- specifically, the angle of critical state shearing resistance and the critical state loci in the void ratio vs. logarithmic effective stress domain- were experimentally assessed for five different silt and sand. The apparatus developed by Santamarina and Cho (2001) was modified to test Cine, Sile Silica, Tekirdag Silica and Aygaz Alluvial sands from Turkiye, along with Sabratah ilt from Libya to assess their critical state characteristics. To eliminate the need for fully saturating the sand samples, image processing techniques were utilized to facilitate the monitoring of volume changes when these samples were subjected to large strains, ensuring to reach critical state. Particle shape characteristics specifically, the sphericity (S) and roundness (R) of grains—were determined using a digital microscope with a 1600x zoom capability. Additionally, grain size distribution, void ratio limits, and specific gravity of the samples were evaluated. These test results, jointly with the data compiled from the literature, were used to assess critical state angle of shearing resistance and locus in the void ratio (e) vs. mean effective stress (p’) domain.

Subject Keywords

Critical state loci, Particle morphology, Angle of shearing resistance, Particle sphericity, Particle angularity

URI

https://hdl.handle.net/11511/111523

Collections

Graduate School of Natural and Applied Sciences, Thesis