Study on Flow and Settlement Performance Evaluation and Optimization of Coal Gangue Slurry Filling Material Based on Fractal Gradation
Source abstract
Abstract
Coal gangue slurry filling technology is an effective way of utilizing coal gangue solid waste resources rationally, and its fluidity and sedimentation behavior have an essential influence on filling performance. However, evaluation and optimization methods for the fluidity and sedimentation performance of coal gangue slurry filling materials (CSFMs) are still scarce. In order to solve this problem, based on the fractal grading theory, this paper carried out an experimental study on the influence of the fractal dimension on the flow characteristics of CSFMs, revealed the impact of the fractal dimension on the flow performance of slurry, and constructed a CSFM flow performance evaluation and optimization model based on the fractal dimension. At the same time, the influence of the fractal dimension on solid mass fraction and particle distribution in the CSFM sedimentation process was analyzed using a sedimentation experiment. Combined with fitting analysis and model construction, a CSFM sedimentation performance evaluation method based on fractal dimension D was proposed. The results show that (1) the slump, expansion, and yield stress of CSFMs increased first and then decreased with the increase in the fractal dimension, and the bleeding rate of CSFMs decreased with the rise in the fractal dimension. The analysis of the consistency coefficient of CSFMs shows that the increase in the proportion of fine particles will increase the consistency coefficient. (2) The fitting analysis indicates that the fractal dimension D of CSFMs is negatively correlated with the sedimentation performance PS. The change in D is most significant in the range of 2.3 to 2.4, where the slurry’s stability is poor. When D exceeds 2.5, the slurry’s stability improves significantly. (3) Based on the evaluation of flow performance and settlement performance, the flow performance and settlement performance of CSFMs with fractal dimensions between 2.50 and 2.59 achieve the best balance, which ensures the reliability of long-distance transportation and construction quality. The research results can provide a reference for the pipeline transportation of whole gangue slurry and have important practical significance for realizing the large-scale disposal of gangue solid waste and green mining of coal mines.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Tailings Management and Properties · Geotechnical and Geomechanical Engineering · Rock Mechanics and Modeling
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
Key Laboratory of Western Mines and Hazards Prevention, Ministry of Education of China, Xi’an 710054, China
Funding
The National Natural Science Foundation of China · The Key R & D plan of Shaanxi Province in 2023
References (60)
Show source-provided references
1. Comprehensive utilization and environmental risks of coal gangue: A review10.1016/j.jclepro.2019.117946 ↗
2. Current situation and prospects of coal gangue’s comprehensive utilization
3. Exposure of heavy metals in coal gangue soil, in and outside the mining area using BCR conventional and vortex assisted and single step extraction methods. Impact on orchard grass10.1016/j.chemosphere.2020.126960 ↗
4. Literature overview of Chinese research in the field of better coal utilization10.1016/j.jclepro.2018.02.216 ↗
5. Application and Prospect of Coal Gangue Slurry Filling Technology
6. Deng, Y.L., Wei, K.J., and Zhao, D.F. (2021). Resource Utilization of Coal Gangue Solid Waste in the Field of Construction and Environmental Restoration in China. Energy Res. Util., 33–36.
7. Song, W.J., Zhang, J.X., Li, M., Yan, H., Zhou, N., Yao, Y.N., and Guo, Y.B. (2022). Underground Disposal of Coal Gangue Backfill in China. Appl. Sci., 12.10.3390/app122312060 ↗
8. A long-term study on the soil reconstruction process of reclaimed land by coal gangue filling10.1016/j.catena.2020.104874 ↗
9. Wu, D., Wang, Y.Y., Wang, M.C., Wei, C., Hu, G.Q., He, X.L., and Wei, F. (2021). Basic characteristics of coal gangue in a small-scale mining site and risk assessment of radioactive elements for the surrounding soils. Minerals, 11.10.3390/min11060647 ↗
10. Influence of block shape on macroscopic deformation response and meso-fabric evolution of crushed gangue under the triaxial compression10.1016/j.powtec.2021.02.001 ↗
11. Research on Migration Law of Mn in Mudstone Floor in the Goaf under Coupling Conditions of Seepage and Stress10.15244/pjoes/99907 ↗
12. Current technological innovation and development direction of the 14th Five-Year Plan period in China coal industry
13. Wang, J.Q., Zhang, J.X., Li, M., Sartaj, M., and Wang, Y.B. (2022). A Numerical Simulation of the Interaction of Aggregate and Rockfill in a Gangue Fluidized Filling Method. Sustainability, 14.10.3390/su141912838 ↗
14. Li, Y.B., Yang, Y.K., and Su, X.G. (2011, January 6). Research on In-situ Disposal Technique of Coal Gangue. Proceedings of the 2011 International Conference on Environmental Systems Science and Engineering (ICESSE 2011), Dalian, Liaoning, China.
15. Research progress of technologies for intelligent separation and in-situ backfill in deep coal mines in China
16. Multisolid waste collaborative production of aeolian sand-red mud-fly ash cemented paste backfill
17. Research and application of gangue filling in Xiaobaodang Coal Mine
18. Research on proportion and performance optimization of pure gangue backfilling slurry based on multi-objective differential evolution algorithm10.1016/j.conbuildmat.2024.135432 ↗
19. Wang, C.H., and Gan, D.Q. (2021). Study and Analysis on the Influence Degree of Particle Settlement Factors in Pipe Transportation of Backfill Slurry. Metals, 11.10.3390/met11111780 ↗
20. Study on pumpability of paste filling slurry and filling plugging factors in Daliang Mining Group
21. Rheological properties analysis and critical velocity calculation of filling slurry
22. Liquidity Detection Based on the Slump Testing of Coarse Aggregate Filling Material
23. Fluidity Influencing Factor Analysis and Ratio Optimization of New Filling Slurry Based on the Response Surface Method10.32604/jrm.2022.018607 ↗
24. Experiment and numerical simulation study of polycarboxylate superplasticizer modified cemented ultrafine tailings filling slurry: Rheology, fluidity, and flow properties in pipeline10.1016/j.conbuildmat.2024.137041 ↗
25. Study on the suspended properties of gangue particles with high concentration of gangue and fly ash
26. Assessment of rheological and sedimentation characteristics of fresh cemented tailings backfill slurry10.1080/17480930.2020.1826092 ↗
27. Robustness of the rescaled range R/S in the measurement of noncyclic long run statistical dependence10.1029/WR005i005p00967 ↗
28. Mandelbrot, B.B., and Freeman, W.H. (1982). The Fractal Geometry of Nature, W.H. Freeman and Co.
29. Dynamic fracture behaviors and fragment characteristics of pre-compressed flawed sandstones10.1016/j.ijmecsci.2022.107162 ↗
30. Fractal model for rockfill shear strength based on particle fragmentation10.1007/s10035-015-0591-z ↗
31. Fractal dimension of concrete incorporating silica fume and its correlations to pore structure, strength and permeability10.1016/j.conbuildmat.2019.116986 ↗
32. Quan, C.Q., Jiao, C.J., Chen, W.Z., Xue, Z.C., Liang, R., and Chen, X.F. (2023). The Impact of Fractal Gradation of Aggregate on the Mechanical and Durable Characteristics of Recycled Concrete. Fractal. Fract., 7.10.3390/fractalfract7090663 ↗
33. Rheological properties of cemented gangue backfill material based on fractal characteristics of waste coal gangue10.1007/s11356-023-25452-4 ↗
34. Study on the filling and grouting performance of gangue slurry and its influencing factors
35. Analysis on “Concrete Water Consumption Standard” JGJ63-2006
36. Relationship between fractal dimension and road performance of dense-gradation asphalt mixture
37. Investigation into changes in pastefill properties during pipeline transport10.1016/j.minpro.2017.04.003 ↗
38. Research on fine tailings bleeding characteristics and the influencing factors
39. Study of the laboratory Vane test on mortars10.1016/j.buildenv.2005.08.016 ↗
40. Numerical study on the pipe flow characteristics of the cemented paste backfill slurry considering hydration effects10.1016/j.powtec.2018.11.070 ↗
41. Influence of gangue gradation coefficient on the performance of filling material based on talbol theory
42. Kim, S.W., Yeo, C.E., and Lee, D.Y. (2019). Effect of Fines Content on Fluidity of FCC Catalysts for Stable Operation of Fluid Catalytic Cracking Unit. Energies, 12.10.3390/en12020293 ↗
43. Effect of particle gradation on properties of fresh and hardened cemented paste backfill10.1016/j.conbuildmat.2015.08.057 ↗
44. The effect of coarse aggregate gradation on the properties of self-compacting concrete10.1016/j.matdes.2012.03.035 ↗
45. The effect of coarse aggregate on the bleeding and mechanical properties of cemented paste backfill10.1007/s11771-023-5238-3 ↗
46. Status and prospects of research on the rheology of paste backfill using unclassified tailings (Part 2): Rheological measurement and prospects
47. Experimental study on correlativity between rheological parameters and grain grading of coal gauge backfill slurry
48. Rheological properties of cement-based slurry and evaluation of rheological model: Influence of particle size and shape10.1016/j.conbuildmat.2023.133498 ↗
49. Influences of shear-mixing rate and fly ash on rheological behavior of cement pastes under continuous mixing10.1016/j.conbuildmat.2018.08.091 ↗
50. Effect of Rheology on Properties of Ultra-high Ductility Cementitious Composites
51. Li, Q.C. (2021). Study on the Rheological Behaviour of Cement Pastes with the Addition of Nano-Metakaolin. [Master’s Thesis, Dalian Maritime University].
52. Li, L.T. (2020). Study on Segregation Mechanism and Control Technology Coarse Aggregate Filling slurry in Jinchuan. [Ph.D. Thesis, University of Science and Technology Beijing].
53. Influence of particle gradation and timeliness on rheological properties of filling slurry
54. Explanations for the cause of shear thickening in concentrated colloidal suspensions10.1122/1.550884 ↗
55. Li, W., Shang, Y.M., and Ji, Y. (2008, January 19–20). Analysis of Multiple Objective Decision Methods Based on Entropy Weight. Proceedings of the 2008 IEEE Pacific-Asia Workshop on Computational Intelligence and Industrial Application, Wuhan, China.
56. Effect of coal particle size distribution, volume fraction and rank on the rheology of coal–water slurries10.1016/S0378-3820(03)00198-X ↗
57. Effect of mixture of natural and synthetic surfactant and particle size distribution for stabilized high-concentrated coal water slurry10.1080/19392699.2019.1592166 ↗
58. Particle sedimentation monitoring in high-concentration slurries10.1063/1.4967350 ↗
59. Li, T., Yang, T., Cheng, L.J., Liu, Z.J., and Yang, T.Y. (2024). Study on the suspension state stability of coal-based solid waste filling slurry of long-distance pipeline transportation. Coal Sci. Technol., 1–14.10.3390/pr12091937 ↗
60. An analytical solution to estimate the settlement of tailings or backfill slurry by considering the sedimentation and consolidation10.1016/j.ijmst.2021.02.004 ↗