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| Macro-fine-micro mechanism of cellulose nanofiber modified gangue cemented filling material |
| WU Jiangyu1, 2, SUN Minhui1, PU Hai1, JING Hongwen1, CHEN Shujian3, WU Yunjie1,ZHANG Hao2, YIN Qian1, MA Dan4 |
| (1. State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Earth Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China; 2. State Key Laboratory of Engineering Materials for Major Infrastructure, Jiangsu Research Institute of Building Science Co., Ltd., Nanjing, Jiangsu 210008, China; 3. School of Civil Engineering, University of Queensland, Queensland, St Lucia 4072, Australia; 4. Key Laboratory of Deep Coal Resource Mining of Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China) |
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Abstract Roadside backfill mining applies gangue cemented rockfill to replace coal pillars, which significantly reduces the loss of coal resources and promotes the source reduction of mine waste. Cemented rockfill is easy to be damaged and deteriorated under the action of overlying strata. It is still a serious challenge to strengthen the performance of cemented rockfill with low cost and high solid waste ratio. In order to solve the fundamental contradiction between the reinforcement of mechanical performances and the cost reduction of filling materials, this paper uses cellulose nanofibers to reinforce cemented rockfill. The macro-meso-micro mechanisms of nano-modified gangue cemented rockfill were investigated. The mechanical compression, acoustic emission monitoring, X-ray diffraction, thermogravimetric, mercury intrusion and microscopic scanning tests were carried out on cemented rockfill materials with different cellulose nanofiber dosages to investigate their strength, deformation and acoustic emission characteristics, hydration products, pore structure and microstructure characteristics. A two media-three interfaces discrete element model was established considering gangue shape parameters, particle size distribution, and interface transition zone between gangue and cemented matrix. The meso-structural characteristics such as force chain network, crack distribution and particle damage after bearing deformation and failure of cemented rockfill materials were discussed. The results show that the compressive strength of cemented rockfill materials increases first and then decreases with the dosage of cellulose nanofibers. The maximum strength enhancement effect induced by the optimal dosage of 0.10% can reach more than 40%, which is attributed to its promotion effect on hydration reaction and the densification of pore structure and interface transition zone. However, it was also found that excessive cellulose nanofibers inhibited the hydration reaction and formed more nanopores. By adjusting the strength ratio of the cementing matrix and the interfacial transition zone to the gangue, the cellulose nanofibers induce the transformation of the main control fracture of the interfacial transition zone to the synergistic control fracture of the gangue bulking-interfacial transition zone. The crack development of the former starts from the interface transition zone, the cemented matrix is seriously damaged, and the gangue damage is small. The crack development of the latter starts from the expansion of the gangue, accompanied by the cracking of the interface transition zone, and the local gangue failure is more serious than cemented matrix.
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2025, Vol. 44 
