ABSTRACT
The increase of water content in tailings is the key cause of various diseases. In order to study the microscopical mechanism of tailings capillary water transport, an online monitoring capillary water rise test system was developed by itself, which mainly includes distortionless high definition digital microscope, 3-D mobile microscopic observation frame, CAMERA/VIEW PLAY CAP wireless acquisition system and computer. The system is used to carry out the dynamic real-time observation experiment of the capillary water rising process of tailings, analyze the movement trajectory and migration characteristics of the capillary water, and clarify the evolution law of the unsaturated tailings micro-structure under the hydraulic path. The results show that: There is a power exponential relationship between the rising height of capillary water and time, and the rising process can be divided into pure inertia stage, viscosity-inertia stage and pure viscosity stage. Capillary absorption is a process of non-uniform water absorption, the water content of the capillary zone decreases with the increase of the height, and its relationship curve shows an inverse “S” shape, the water content varies from 4.15% to 21.3%. Capillary water migration is a dynamic process in both vertical and lateral directions and the most obvious change in the microscopic structure of tailings is the occurrence of water in pores, with the change of the saturation from low to high, the occurrence shows the shape of pendulum, ring cord, capillary and serous liquid bridge. The capillarity of tailings follows the order of macropores, mesopores and micropores to absorb water, most of which occurs in mesopores, the mechanism of ‘in the macropores and mesopores, capillary water increased preferentially’ in tailings granular materials is proposed. The research results revealed the internal correlation mechanism of macro and micro capillary mechanics of tailings, clarified the evolution model of the micro-structure of tailings during the rise of capillary water, and further clarified the reasons for the macroscopic damage phenomenon of granular materials caused by the development process of tailings particle drying to humidification.
KEYWORDS
PAPER SUBMITTED: 2023-07-15
PAPER REVISED: 2023-10-06
PAPER ACCEPTED: 2023-10-16
PUBLISHED ONLINE: 2023-12-10
THERMAL SCIENCE YEAR
2024, VOLUME
28, ISSUE
Issue 3, PAGES [2657 - 2668]
- Yao, H., et al., Current Status and Development of Comprehensive Utilization of Waste Rock in Metal Mines in China, Chinese Journal of Non-ferrous Metals, 32 (2019), 6, pp. 1649-1660
- Sun, W., et al., Experimental Research on Disintegration Characteristics of Subsidence Paste Backfill Body of Tong-Keng Mine, Chinese Journal of Rock Mechanics and Engineering, 36 (2017), S1, pp. S3224-S3232
- Chen, Q., et al., In-Situ Stabilization/Solidification of Lead/Zinc Mine Tailings by Cemented Paste Backfill Modified with Low-Carbon Bentonite Alternative, Journal of Materials Research and Technology, 17 (2022), Mar.-Apr., pp. 1200-1210
- Liu, D., et al., Experimental Study on Capillary Water Migration Characteristics of Tailings with Different Particle Sizes, Geofluids, 5 (2022), 46, pp. 518-530
- Tana, A., et al., Investigation on Mechanical Characteristics and Microstructure of Cemented Whole Tailings Backfill, Minerals, 11 (2021), 6, pp. 592-602
- Liu, D., et al., Effect of the Lenticles on Moisture Migration in Capillary Zone of Tailings Dam, International Journal of Minerals, Metallurgy and Materials, 27 (2020), Aug., pp. 1036-1045
- Lewis, M., et al., Discussion of Capillary Phenomena in Cohesionless Soils, Revue de linfirmière, 42 (2014), 1, pp. 18-21
- Zhang, Z., et al., Evolution of Capillary Force of Liquid Bridge Between Clay Particles in Process from Its Formation Rupture, Rock and Soil Mechanics, 37 (2016), 10, pp. 2845-2850
- Liu, T., et al., Effect of Fly Ash Content on Capillary Water Rise Law in Sandy Soil, Journal of China Coal Society, 41 (2016), 11, pp. 2836-2840
- Liu, D., et al., Experiment on Tailings Capillary Characteristics Based on Particle Size Effect, The Chinese Journal of Non-ferrous Metals, 30 (2020), 11, pp. 2746-2757
- Zandarin, M., et al., The Role of Capillary Water in The Stability of Tailing Dams, Engineering Geology, 105 (2009), 1-2, pp. 108-118
- Zhang, Z., et al., Rising Law of Capillary Water in Tailings Dam of Metal Mine, The Chinese Journal of Non-Ferrous Metals, 24 (2014), 05, pp. 1345-1351
- Zhang, Q., et al., Influence of Temperature and Air Pressure on Rising Law of Capillary Water in Tailings Dam of Metal Mine, The Chinese Journal of Non-ferrous Metals, 27 (2017), 05, pp. 1016-1022
- Yin, G., et al., Experimental Study of Migration Characteristics of Pore Water and Its Effect on Meso-Structure of Tailings, Chinese Journal of Rock Mechanics and Engineering, 31 (2012), 01, pp. 71-79
- Zhang, E., et al., Experimental Study on Capillary Water Absorption Properties of Tailings Paste Filling Material, Non-Metallic Mines, 40 (2017), 06, pp. 33-35
- Jiang, M., et al., New Paradigm for Modern Soil Mechanics: Geomechanics from Micro to Macro, Chinese Journal of Geotechnical Engineering, 41 (2019), 02, pp. 195-254
- Yang, Y., et al., Study on the Shapes of Tailings Particles Based on Microscopy and Image Processing Technologies, Chinese Journal of Rock Mechanics and Engineering, 36 (2017), S1, pp. S3689-S3695
- Jozefaciuk, G., et al., Effect of Humic Acids, Sesquioxides and Silica on the Pore System of Silt Aggregates Measured by Water Vapour Desorption, Mercury Intrusion and Microtomography, European Journal of Soil Science, 66 (2015), 6, pp. 992-1001
- Khlyupin, A., Dinariev, O. Y., Fractal Analysis of the 3-D Microstructure of Porous Materials, Technical Physics, 60 (2015), June, pp. 805-810
- Zhang, T., et al., Engineering Properties and Microstructural Characteristics of Foundation Silt Stabilized by Lignin-Based Industrial by-Product, KSCE Journal of Civil Engineering, 20 (2016), 7, pp. 2725-2736
- Zhang, J., et al., The 3-D Multifractal Characteristics of Soil Pores in Coal Mine Dump Based on CT Scanning, Chinese Journal of Soil Science, 48 (2017), 04, pp. 786-793
- Chareyre, B., Comment on Flow of Wet Granular Materials: A Numerical Study, Physical Review E, 96 (2017), 1-2, pp. 515-526
- Jiao, Y., et al., Analyses of Droplet Spreading and the Movement of Wetting Line on a Solid Surface, Acta Physica Sinica, 65 (2016), 1, pp. 348-355
- Gao, S. Q., Peng, L. H., Capillary Mechanics, Science Press, Beijing, China, 2010
- Wang, Z., et al., Pore Properties of the Lacustrine Shale in the Upper Part of the Sha-4 Member of the Paleogene Shahejie Formation in the Dongying Depression in East China, Geofluids, 2021 (2021), ID6616843
- Huang, Y., et al., Characterization of Pore Microstructure and Methane Adsorption of Organic-Rich Black Shales in Northwestern Hunan, South China, Energy Exploration and Exploitation, 38 (2019), 3, pp. 1-21
- Jia, H., et al., Influence of Water Content on the Physical and Mechanical Behaviour of Argillaceous Siltstone and Some Microscopic Explanations, Chinese Journal of Rock Mechanics and Engineering, 037 (2018), 7, pp. 1618-1628
- Aksu, A. I., et al., Swelling of Clay Minerals in Unconsolidated Porous Media and Its Impact on Permeability, Geo. Res. J., 7 (2015), Sept., pp. 1-13
- Peng, W., et al., Enhancement Technology of Underground-Water Flow Field in Coal Mine to Improve Energy Efficiency of Heat Pump System in Geothermal Energy Development, Thermal Science, 27 (2023), 2A, pp. 1191-1198
- Li, T., et al., Mesoscopic Effect of Water Content on The Shape of Loose Body in Ore Drawing, Journal of Beijing University of Science and Technology, 40 (2018), pp. 665-672
