加浆改性固体充填材料承载压缩特性与固结机制  

Compression load-bearing characteristics and consolidation mechanism of grout-modified solid backfill materials

作　　者：杨科[1,2] 方珏静 张吉雄 ASLANI Farhad[4] 何祥 张连富[1,2] 吕鑫 魏祯 YANG Kel;FANG Juejingl;ZHANG Jixiong;ASLANI Farhad;HE Xiangl;ZHANG Lianful;LYU Xin;WEI Zhenl(School of Mining Engineering,Anhui University of Science and Technology,Huainan,Anhui 232001,China;Institute of Energy,Hefei Comprehensive National Science Center,Hefei,Anhui 230031,China;School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;School of Engineering,Civil,Environmental and Mining Engineering,The University of Western Australia,Perth 6009,Australia)

机构地区：[1]安徽理工大学矿业工程学院,安徽淮南232001 [2]合肥综合性国家科学中心能源研究院,安徽合肥230031 [3]中国矿业大学矿业工程学院,江苏徐州221116 [4]西澳大学土木、环境与采矿工程学院,澳大利亚珀斯6009

出　　处：《中国矿业大学学报》2024年第3期456-468,共13页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(52130402);国家重点研发计划项目(2019YFC1904304);国家留学基金委资助项目(202308340082)。

摘　　要：为提高井下固体充填采充作业效率,增强充填材料承载性能,设计了不同粉煤灰掺量的加浆改性固体充填材料压实试验,并开展了不同养护龄期的胶结充填体单轴压缩测试,探究了加浆散体压实力学特征,分析了粉煤灰掺量及养护龄期对胶结充填体的强度影响及变形破坏趋势,结合加浆散体压实界面黏结特性及胶凝浆液水化过程,阐明了加浆改性固体充填材料承压变形特性及固结承载机理.研究结果表明:加浆改性固体充填材料承载性能受加浆散体压实与胶凝浆液交互补强的动态影响,其承载机制包括矸石啮合、黏结补强和胶结固化3个关键过程;压实过程中应力-应变曲线表现出孔隙压密、滑移调整及破碎重构3个阶段,并随着粉煤灰掺量的增加,抵制变形的能力增强;粉煤灰掺量对胶结充填体性能具有双向作用,在养护28 d时,粉煤灰掺量为10%的胶结充填体达到强度阈值.研究成果对于固体改性充填工艺的优化具有较大参考价值,为充填体后期强度提高及充填成本的降低提供了理论及数据支撑.YANG Ke;FANG Juejing;ZHANG Jixiong;ASLANI Farhad;HE Xiang;ZHANG Lianfu;LYU Xin;WEI Zhen;School of Mining Engineering, Anhui University of Science and Technology;Institute of Energy, Hefei Comprehensive National Science Center;School of Engineering, Civil, Environmental and Mining Engineering, The University of Western Australia;School of Mines, China University of Mining and Technology;To enhance the efficiency of underground solid backfill mining operations and improve the load-bearing capacity of backfill materials, a compaction experiment of solid backfill 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 compaction 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 resistance to deformation strengthens. The fly ash content has a bidirectional effect on the performance 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

关 键 词：固废充填 加浆改性固体充填 压实变形 承载特性 固结机制 养护龄期 

分 类 号：TD841[矿业工程—煤矿开采]