Geomechanics and Engineering
Volume 44, Number 2
DOI: 169-189
Effect of particle geometry on high-stress compressibility of tailings: laboratory experiments and discrete element modelling
Changkun Ma , Ruixin Li , Chao Zhang , Qinglin Chen
Abstract
The permeability and compressibility of a saturated tailing materials are important parameters in the field of mining safety and geotechnical engineering. The geometric characteristics of a porous medium are key factors in the prediction of its permeability and compressibility. In this paper, the compression and hydraulic characterizes of different gradation tailings through high-stress permeability compression tests were herein investigated. Then, the relationship between the geometric parameters and the high-stress permeability and compressibility of tailings is established. Based on PFC numerical simulation, the non-spherical cluster particles with different fractal dimension and other geometric parameters were constructed, and the compression simulations considering particle breakage were carried out. Using tests and simulations analysis, the influence degree on the compressibility of tailings is as follows: Ultrafine content (Fc) > Roundness (Rc) > Sphericity (Sk) > Fractal dimension (Fd). Numerical simulation proves that particle breakage and water film are closely related to particle shape, and the prediction formula proposed has a wider scope of application on high-stress permeability and compressibility of saturated tailings materials.
Key Words
geometrical parameter; high stress; numerical simulation; permeability and compression; saturated tailings material
Address
- Changkun Ma and Chao Zhang — State Key Laboratory of Geomechanics and Geotechnical Engineering Safety, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; Key Laboratory of slope safety risk warning and disaster prevention and mitigation, Ministry of Emergency management, Wuhan, Hubei 430071, China
- Ruixin Li — State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430071, China
- Qinglin Chen — School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China
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