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- W2990664908 abstract "The aim of this thesis is to investigate the sedimentation and consolidation behaviour of coal mine tailings after sub-aqueous deposition. The study concentrated on the mathematical, numerical and laboratory physical modelling of the sedimentation and consolidation processes. The results described in the thesis may be used to estimate a required impoundment capacity and the volume of seepage of water from impounded coal tailings, to calculate the rate and magnitude of the surface settlement of impounded coal tailings and to provide information for selecting an appropriate time for land rehabilitation to commerce and determining land re-use options.Coal mine tailings and tailings water from New Hope Colliery which is situated in the West Moreton Coalfield of South-eastern Queensland, Australia, were used as the testing material for the investigation. Physical, chemical and mineralogical properties of the tailings have been studied. The coal mine tailings comprise a little less than 50% mineral matter with the rest being pure coal. The main minerals present are quartz and kaolinite. The coal tailings, with about 25% clay particles, correspond to a low plasticity clay in the Unified Soil Classification System. Their average specific gravity is 1.725. The simultaneous processes of sedimentation and self-weight consolidation of coal mine tailings in a settling pond were idealized as a one-dimensional problem and have been physically modelled in the laboratory using three different settling columns. Factors influencing the process of sedimentation were studied in small columns. Pore water pressures generated by sedimenting and consolidating were measured in tests using a large settling column. A glass settling column was constructed and used for applying gamma-ray attenuation techniques to determine density profiles of settling tailings as well as pore water pressures. Oedometer and Rowe cell consolidation test results were used to determine consolidation parameters for the coal tailings. A coupled mathematical model describing simultaneous sedimentation and consolidation was developed. The model was based on mass conservation and momentum laws and accounted for particle segregation and a moving boundary between a slurry and its supernatant." @default.
- W2990664908 created "2019-12-05" @default.
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- W2990664908 date "2019-11-07" @default.
- W2990664908 modified "2023-09-27" @default.
- W2990664908 title "UQ eSpace" @default.
- W2990664908 doi "https://doi.org/10.14264/238a233" @default.
- W2990664908 hasPublicationYear "2019" @default.
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