Study on mechanical properties and destabilization mechanism of unclassified tailings consolidation body under the action of dry-wet cycle

Song, Xuepeng; Hao, Yuxin; Huang, Jin; Wang, Shi; Liu, Wu

doi:10.1016/j.conbuildmat.2022.130022

Cited by 17 publications

(2 citation statements)

References 31 publications

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“…Near the discharge outlet, in the dry beach area, tailings particles are coarser, while they are finer in the sedimentation area farther away. Due to their particle size distribution, tailings materials have a highly sensitive and unstable structure compared to natural soils, leading to significant differences in their static and dynamic behaviors [14][15][16]. Tailings sands, with larger pores, lower density, and lower plasticity index, are less weathered and altered, making them prone to liquefaction and strength loss under dynamic loading [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characteristics of Tailings in Different Depositional Zones: A Case Study of Caijiagou Tailings Pond in Shaanxi, China

Zhang,

Hu,

et al. 2024

Advances in Civil Engineering

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This study examines the widespread practice of upstream tailings dam construction in metallurgical mines in China, conducting comprehensive testing and research on tailings from various depositional zones of the Caijiagou tailings pond. Analysis of the test results from three types of tailings reveals a systematic relationship between the mechanical characteristics of tailings and their depositional zones: the farther from the dam, the finer the tailings particles, categorized as silty clay tailing, silt tailing, and sandy silt tailing. Consistent patterns were observed in the consolidated-drained shear strength and consolidated-undrained effective shear strength of these tailings. Among these, sandy silt tailing exhibited the highest strength, whereas silty clay tailing displayed the lowest. The dynamic stress–strain relationships of all three tailings types are described using the Hardin equivalent viscous-elastic model, where the initial dynamic shear modulus and the maximum dynamic shear stress in the model increased with effective confining pressure. The damping ratios exhibited a three-stage trend with increasing dynamic strain: gradual increase, rapid growth, and then gradual stabilization. Under various consolidated stress conditions, the ratio of the damping ratio to the maximum damping ratio versus the reduction in dynamic shear modulus showed a favorable linear relationship. Under vibration conditions, the dynamic shear stress corresponding to tailings failure increased with higher effective confining pressure and consolidated stress ratio. Finally, this study summarizes the parameters and indicators related to the saturated tailings of iron mines used in the research. Our work provides a foundation and reference for the design of tailings dams and the development and utilization of abandoned tailings ponds.

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Section: Introductionmentioning

confidence: 99%

Mechanical Characteristics of Tailings in Different Depositional Zones: A Case Study of Caijiagou Tailings Pond in Shaanxi, China

Zhang,

Hu,

et al. 2024

Advances in Civil Engineering

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“…At present, there are few reports on the pore structure and permeability of backfill. Song Xue et al [27] found that tailings particles generated from metal mines may contain radioactive components and heavy metal ions, and harmful substances will flow out with water seepage around the backfill after they are used in mine backfill, thus causing pollution to the underground environment and even groundwater. Zhang et al [28] studied the permeability characteristics of backfill and designed and prepared highly durable underground backfill artificial pillars.…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Study on the Improvement of Gangue/Tailing Cemented Fill by Bentonite: Flow Properties, Mechanical Properties and Permeability

Wang,

Chen,

Guo

et al. 2023

Materials

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Backfill mining has significant advantages in safe mining, solid waste utilization and ecological environmental protection, but solid waste materials (tailings, gangue and coal gasification slag, etc.), as derivative residues of the chemical and metallurgical industries, contain a large number of heavy metal elements, which is posing great challenges to the underground environment after backfill. In order to study the feasibility of bentonite for reducing the permeability of gangue/tailing sand cemented backfill body, relevant tests were carried out from the basic performance index, flow performance and mechanical properties of paste backfill materials. The test results show that bentonite has a significant effect on the water secretion rate of cemented fillers, and also promotes the improvement of slump and diffusion diameter of backfill slurry. The enhancement effect of mechanical properties in the early stage is not obvious, mainly concentrated in the middle and late stages of specimen curing. With the increase of bentonite content, the 28-day uniaxial compressive strength increased from 7.1 MPa and 7.9 MPa to 8.7 MPa and 9.0 MPa, respectively. Bentonite is filled between the pores of the cemented backfill with its fine particles and water swelling, which can reduce the porosity and permeability of the gangue and tailings cemented backfill. Therefore, on the premise of satisfying the flow and mechanical properties of paste backfill, bentonite can be used to improve the permeability of cemented backfill and reduce the leaching and migration of heavy metal ions.

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Experimental Research on a Feasible Building Insulation Material Based Reed in China

Liu,

Peng,

Liu

et al. 2024

J. Therm. Sci.

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Study on mechanical properties and destabilization mechanism of unclassified tailings consolidation body under the action of dry-wet cycle

Cited by 17 publications

References 31 publications

Mechanical Characteristics of Tailings in Different Depositional Zones: A Case Study of Caijiagou Tailings Pond in Shaanxi, China

Mechanical Characteristics of Tailings in Different Depositional Zones: A Case Study of Caijiagou Tailings Pond in Shaanxi, China

A Preliminary Study on the Improvement of Gangue/Tailing Cemented Fill by Bentonite: Flow Properties, Mechanical Properties and Permeability

Experimental Research on a Feasible Building Insulation Material Based Reed in China

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