Journal of Chemistry and Chemical Research

The rational application of coal gangue in underground backfilling has emerged as a crucial approach to achieving green mining and comprehensive utilization of resources in mines. This study takes coal gangue as the primary raw material, conducts a systematic analysis of the mechanical properties of backfilling materials under different proportion schemes, and focuses on investigating their strength evolution law. Through laboratory experiments and data comparison, the influences of cement content, coal gangue particle gradation, and additive dosage on the short-term and long-term strength of backfill bodies are identified, and a relatively sound proportion optimization model is established. A reasonable proportion can not only effectively enhance the overall stability of backfill bodies but also improve the load-bearing performance of underground goafs, providing a scientific basis for mine mining safety and the resource utilization of solid wastes. This research offers a feasible path for the engineering application of coal gangue and holds practical significance for promoting the green and low-carbon development of the coal industry.

Coal gangue; Underground backfilling; Proportion optimization; Strength evolution law