Research on proportion optimization and strength evolution law of coal gangue-based underground backfilling materials
煤矸石井下充填材料配比优化与强度演化规律研究

摘要

煤矸石在井下充填中的合理利用已成为实现矿山绿色开采与资源综合利用的重要途径。本研究以煤矸石为主要原料，结合不同配比方案对充填材料的力学性能进行系统分析，重点探讨了其强度演化规律。通过室内试验与数据对比，明确了水泥掺量、煤矸石颗粒级配及添加剂用量对充填体早期和长期强度的影响，并建立了较为合理的配比优化模型。合理的配比不仅能有效提升充填体的整体稳定性，还能改善井下采空区的承载性能，为矿山开采安全和固废资源化利用提供科学依据。该研究为煤矸石的工程应用提供了可行路径，对推动煤炭行业绿色低碳发展具有现实意义。

Abstract

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.