Effect of 3D-printed polymer with negative Poisson's ratio structure on the mechanical characteristics of cemented tailings backfill

作者：Jiangyu Wu, Shihao Li, Louyan Shen, Dan Ma, Gaofang Zhu, Qian Yin, Hao Zhang, Hongwen Jing, Hai Pu · 发表于：Case Studies in Construction Materials · 年份：2025 · DOI：10.1016/j.cscm.2025.e04665 · 被引用次数：3 · 研究领域：Tailings Management and Properties、Advanced materials and composites、Rock Mechanics and Modeling

In underground mining environments, the structural instability of cemented tailings backfill (CTB), primarily attributed to brittle fracture behavior, represents a critical safety concern. This research utilized 3D-printed negative Poisson's ratio structural (monomeric, combined, and nested configurations) polymers to improve the brittle fracture resistance of CTB. Uniaxial compression tests, acoustic emission, and scanning electron microscopy were conducted to systematically evaluate the influence of negative Poisson's ratio polymers with different structures on the strength, toughness, stress-strain response, internal damage processes, and microstructural characteristics of CTB. Experimental results showed that using the monomeric configuration negative Poisson's ratio polymer in CTB slightly reduced its strength, while combined and nested configurations increased strength by 27.01 % and 30.66 %, respectively. The post-peak load-carrying capacity and toughness of polymer-reinforced CTB were improved. Specimens reinforced with combined and nested configurations of negative Poisson's ratio structural polymers exhibited superior energy absorption capacity and better internal damage evolution mechanisms, enabling synergistic enhancement of strength and toughness. The cracks in normal CTB were tensile, whereas the cracks in polymer-reinforced CTB were mainly a combination of tensile and shear cracks. The strengthened specimens demonstrated a decreased cumulative number of acoust...