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Experimental Study on Tailings Deposition Distribution Pattern and Sedimentation Characteristics.
Sen Tian1,2, Ying Zhao1, Yuanheng Gong1
1State Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, China.
ACS Omega
|May 6, 2024
Summary
Tailings pond accidents are frequent. This study reveals that increased fine particle content in tailings weakens stratification, delaying consolidation and impacting dry beach length, crucial for tailings pond stability.
Area of Science:
- Geotechnical Engineering
- Environmental Science
Background:
- Tailings pond accidents pose significant risks, including environmental pollution and economic losses.
- Understanding tailings deposition patterns is vital for improving pond safety and operational efficiency.
Purpose of the Study:
- To investigate the horizontal and vertical deposition patterns of tailings.
- To analyze the impact of particle size distribution on tailings sedimentation and stratification.
- To provide data for enhancing tailings pond stability and consolidation efficiency.
Main Methods:
- Conducted sample particle fragmentation experiments.
- Performed settling column experiments to simulate tailings deposition.
- Analyzed tailings particle size distribution in horizontal and vertical directions.
Main Results:
- Median particle size decreased with distance from the subdam horizontally and with depth vertically.
- Increased fine particle content delayed sedimentation and consolidation completion.
- Higher fine particle content weakened stratification, shifting from independent to floc-type sedimentation.
Conclusions:
- Fine particle content significantly affects tailings sedimentation, stratification, and water retention.
- Weakened stratification and increased water retention can lead to higher saturation lines and shorter dry beaches, compromising pond safety.
- Findings offer theoretical guidance for tailings pond consolidation and stability analysis.
