Compression load-bearing characteristics and consolidation mechanism of grout-modified solid backfill materials
To enhance the efficiency of underground solid backfill mining operations and improve the load-bearing capacity of backfill materials,a compaction experiment of solid back-fill materials with different proportions of fly ash was designed.Uniaxial compression tests of cemented backfill bodies at different curing ages were conducted to investigate the mechanical characteristics of the grout-modified loose body compaction.The study analyzed the impact of fly ash content and curing age on the strength,deformation,and failure trends of the cemented fill bodies.By combining the bonding characteristics of the grout-modified loose body compac-tion interface and the hydration process of the cementing slurry,the pressure deformation characteristics and consolidation load-bearing mechanism of the grout-modified solid backfill materials were elucidated.The results show that the load-bearing performance of grout-modified solid backfill materials is dynamically influenced by the interaction of grout-modified loose body compaction and cementing slurry reinforcement,with the load-bearing mechanism comprising three key processes:gangue engagement,bonding reinforcement,and cementation solidification.The stress-strain curve during compaction shows three stages:pore compaction,slip adjustment,and fragmentation reconstruction.With an increase in fly ash content,the re-sistance to deformation strengthens.The fly ash content has a bidirectional effect on the per-formance of the cemented fill body.At 28 days of curing,the cemented fill body with 10％fly ash content reached a strength threshold.The research findings are of great reference value for optimizing solid modification backfill processes and provide theoretical and data support for the improvement of later-stage strength and reduction of backfill costs.
solid waste fillingslurry-modified solid fillingcompaction deformationbearing characteristicsconsolidation mechanismage of maintenance
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