Abstract
It has been proven that it is a feasible treatment method to prepare paste filling material from coal-based solid waste to fill underground goaf. Based on the complexity of the goaf environment, especially the influence of humidity on paste filling materials, this paper prepared paste filling materials with a mass concentration of 80% by using coal gangue and fly ash, and carried out a uniaxial compression test of coal-based solid waste paste filling materials under four different water-bearing states. The experimental results show that: (1) The binary primary equation fits well the variation trend of paste filling strength with water content. With the increase of moisture content, the compressive strength of paste filling material gradually decreases, and the higher the moisture content, the more obvious the influence on the strength of paste filling. (2) The damage evolution equation and constitutive equation of paste filling materials with different moisture content were established. With the increase of strain, the influence of moisture content on the damage of paste filling material decreases gradually, and the moisture content can promote the damage development of paste filling material to a certain extent. (3) The influence mechanism of moisture content on coal based-solid waste paste filling material is discussed from the three aspects of physical effect, structural effect and chemical effect, which provides a direction for further research on the influence mechanism of moisture content on filling strength. The research on the failure mechanism of coal-based solid waste paste filling and the safety production of the mine can be used as a theoretical support.
Funder
Scientific Research Foundation for High-level Talents of Anhui University of Science and Technology
National Natural Science Foundation of China
Subject
Management, Monitoring, Policy and Law,Renewable Energy, Sustainability and the Environment,Geography, Planning and Development,Building and Construction
Reference38 articles.
1. Basic theory of constructional backfill mining and the underground space utilization concept;Feng;J. China Coal Soc.,2019
2. Coal waste management practices in the USA: An overview;Chugh;Int. J. Coal. Sci. Technol.,2014
3. Rybak, J., Adigamov, A., Kongar-Syuryun, C., Khayrutdinov, M., and Tyulyaeva, Y. (2021). Renewable-Resource Technologies in Mining and Metallurgical Enterprises Providing Environmental Safety. Minerals, 11.
4. Breakage mechanism and pore evolution characteristics of gangue materials under compression;Zhang;Acta Geotech.,2022
5. 3D DEM method for compaction and breakage characteristics simulation of broken rock mass in goaf;Zhang;Acta Geotech.,2022
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