Experimental study on consolidation and strength properties of tailings with different particle size distribution characteristics

Sen Tian (), Yi He, Ruyi Bai, Jie Chen and Guangjin Wang
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Sen Tian: Chongqing University
Yi He: Chongqing University
Ruyi Bai: Chongqing University
Jie Chen: Chongqing University
Guangjin Wang: Kunming University of Science and Technology

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2022, vol. 114, issue 3, No 54, 3683-3699

Abstract: Abstract In the storage process, the tailings particle size distribution varies greatly in different regions of the tailings reservoir, which significantly affects the consolidation efficiency of tailings and the stability of tailings dam. Relying on the actual engineering, this study conducted tailings sampling, consolidation and triaxial shear experiments to explore the consolidation characteristics and strength variation rules of tailings under different gradations. The experiments discovered that, with the increase in fine particle content in the tailings, the compressibility and porosity showed greater changes, and the cut-off point between primary and secondary consolidation became more obvious. Besides, with the increase in consolidation pressure, the consolidation coefficient of tailings fine particles exhibited the greater growth, and the coefficient of compressibility declined sharply. Moreover, as the fine particle content increased in the tailings, the strain softening phenomenon appears gradually, and the shear strength of tailings decreased. When coarse particles were dominant in the tailings, the stronger force chain resulted in the more stable pore structure. Therefore, the research results provide some theoretical guidance for scholars to optimize the settlement and consolidation efficiency of tailings and research the fine microstructure strength of tailings.

Keywords: Tailings; Void ratio; Coefficient of compressibility; Secondary consolidation; Strength characteristics (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1007/s11069-022-05537-y

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