Abstract
Due to precipitation infiltration, evaporation of water, and rising and falling of the wetting line, the tailings are in a cyclical moisture absorption‐dehumidification state for a long time. The mechanism of change of physical and mechanical properties of tailings during the dry and wet cycle is related to the safe operation of the entire tailings dam. In order to explore the variation of the mechanical behavior of tailings in a tailings pond in Hunan Province with the number of dry and wet cycles under different initial water content conditions, the tailings sand samples with moisture content of 6.10%, 10.40%, 14.00%, 18.20%, and 21.00% were subjected to 0 to 6 times of moisture absorption and desorption cycles at natural dry density, and then, the stress‐strain relationship curves, pore water pressure, failure mode, and shear dilatancy of these samples were tested by triaxial consolidation undrained shear test. The test results showed that when the number of moisture absorption and desorption cycles increases, the strength of the tailings sand sample was weakened, and the strength tended to be stable after 3∼5 cycles. In addition, the stress‐strain curve of the sample with lower water content dropped sharply. However, the pore pressure of tailings sand samples with different water contents under different wet and dry cycles all showed a phenomenon of increasing first and then decreasing in general.
Highlights
As a peripheral structure of the tailings pond, the safety and stability of the tailings dam is the most important prerequisite for the normal operation of the mining area
Liu et al [7] found that the dry and wet cycles have a greater impact on low-density soils by studying the effects of different dry density soils on moisture absorption and dehumidification cycles. e above research mainly focuses on the cause of dam failure of tailings dam, the connection between consolidation process and dam stability, the influence of dry and wet circulation on dam body, and the relationship between moisture absorption-dehumidification cycle and matrix suction. erefore, there is no quantitative study of water content, which is an influential factor for geotechnical research
We explore the mechanical properties of tailings samples with different water contents under the natural dry density conditions of the wet and dry cycle, mainly including the failure mode, stressstrain relationship curve, pore water pressure, peak deviator stress, and shear dilatancy characteristics of the specimen under the triaxial consolidation undrained shear test. is has important theoretical and practical significance for enriching and perfecting the theory of unsaturated soil mechanics, innovating and developing the stability analysis method of tailings dam, and preventing the occurrence of tailings dam failure
Summary
As a peripheral structure of the tailings pond, the safety and stability of the tailings dam is the most important prerequisite for the normal operation of the mining area. Vaezi et al [2, 3] studied the tailings sand in the tailings pond and found when the tailing sand is discharged, the consolidation process and the increased sediment density can enhance the stability of the dam. E above research mainly focuses on the cause of dam failure of tailings dam, the connection between consolidation process and dam stability, the influence of dry and wet circulation on dam body, and the relationship between moisture absorption-dehumidification cycle and matrix suction. We explore the mechanical properties of tailings samples with different water contents under the natural dry density conditions of the wet and dry cycle, mainly including the failure mode, stressstrain relationship curve, pore water pressure, peak deviator stress, and shear dilatancy characteristics of the specimen under the triaxial consolidation undrained shear test. We explore the mechanical properties of tailings samples with different water contents under the natural dry density conditions of the wet and dry cycle, mainly including the failure mode, stressstrain relationship curve, pore water pressure, peak deviator stress, and shear dilatancy characteristics of the specimen under the triaxial consolidation undrained shear test. is has important theoretical and practical significance for enriching and perfecting the theory of unsaturated soil mechanics, innovating and developing the stability analysis method of tailings dam, and preventing the occurrence of tailings dam failure
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