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

Author

Listed:
  • Sen Tian

    (Chongqing University
    The University of Queensland)

  • Yi He

    (Chongqing University)

  • Ruyi Bai

    (Chongqing University)

  • Jie Chen

    (Chongqing University)

  • Guangjin Wang

    (Kunming University of Science and Technology)

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.

Suggested Citation

  • Sen Tian & Yi He & Ruyi Bai & Jie Chen & Guangjin Wang, 2022. "Experimental study on consolidation and strength properties of tailings with different particle size distribution characteristics," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 114(3), pages 3683-3699, December.
    • Handle: RePEc:spr:nathaz:v:114:y:2022:i:3:d:10.1007_s11069-022-05537-y
    DOI: 10.1007/s11069-022-05537-y
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