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- Title
The Interaction Effect of Particle Composition and Matric Suction on the Shear Strength Parameters of Unsaturated Granite Residual Soil.
- Authors
Wu, Di; Liu, Hailiang; Wang, Changming; Xu, Xin; Liu, Xiaoyang; Wang, Qingyu
- Abstract
The particle composition and water content of granite residual soil (GRS) vary considerably at the horizontal and vertical levels due to weathering environment. This variability has a significant influence on the strength of GRS, especially under the action of matric suction. Five groups of GRS samples with different particle compositions were prepared and tested for soil–water characteristic curve (SWCC) and triaxial undrained shear strength under different matric suctions. Results show that SWCC of GRS is controlled by particle composition and the parameters of SWCC equation all have a well linear relationship with particle composition parameter (particle size fractal dimension D). The coupling of particle composition and matric suction influences the unsaturated shear strength of GRS, mainly by affecting the particle contact mode. When the matric suction varies from 0 to 500 kPa, the strength parameters (apparent internal friction angle φ and apparent cohesion c) show a good linear relationship with log of matric suction lg(ψ). With same matric suction ψ, c and φ show a linear increase and a downward parabolic relationship with particle size fractal dimension D of GRS, respectively. The results will provide some reference for future engineering construction and geological hazard prevention related to GRS.
- Subjects
GRANITE; PARTICLE interactions; FRACTAL dimensions; HAZARD mitigation; INTERNAL friction; SHEAR strength
- Publication
Arabian Journal for Science & Engineering (Springer Science & Business Media B.V. ), 2022, Vol 47, Issue 10, p12453
- ISSN
2193-567X
- Publication type
Article
- DOI
10.1007/s13369-021-06503-9