Journal
GEOSCIENCE FRONTIERS
Volume 11, Issue 2, Pages 375-388Publisher
CHINA UNIV GEOSCIENCES, BEIJING
DOI: 10.1016/j.gsf.2018.10.010
Keywords
Grain crushing; Single-particle strength; One-dimensional compression; Rockfill materials; Weibull distribution
Categories
Funding
- 111 Project [B13024]
- National Science Foundation of China [51509024, 51678094, 51578096]
- Fundamental Research Funds for the Central Universities [106112017CDJQJ208848]
- China Postdoctoral Science Foundation [2017T100681]
- State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining and Technology [SKLGDUEK1810]
Ask authors/readers for more resources
Strength and deformation behaviors of rockfill materials, key factors for determining the stability of dams, pertain strongly to the grain crushing characteristics. In this study, single-particle crushing tests were carried out on rockfill materials with nominal particle diameters of 2.5 mm, 5 mm and 10 mm to investigate the particle size effect on the single-particle strength and the relationship between the characteristic stress and probability of non-failure. Test data were found to be described by the Weibull distribution with the Weibull modulus of 3.24. Assemblies with uniform nominal grains were then subjected to one-dimensional compression tests at eight levels of vertical stress with a maximum of 100 MPa. The yield stress in one-dimensional compression tests increased with decreasing the particle size, which could be estimated from the single-particle crushing tests. The void ratio-vertical stress curve could be predicted by an exponential function. The particle size distribution curve increased obviously with applied stresses less than 16 MPa and gradually reached the ultimate fractal grading. The relative breakage index became constant with stress up to 64 MPa and was obtained from the ultimate grading at the fractal dimension (alpha = 2.7). A hyperbolical function was also found useful for describing the relationship between the relative breakage index and input work during one-dimensional compression tests. (C) 2020, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available