ABSTRACT

The properties of fibre-reinforced cemented paste backfill (CPB) and foam backfill (FB) were investigated through bench-scale vane viscometer, mini-slump and compression tests. Samples of CPB (no air entrained) and FB (10, 20, 30, and 40% air by volume) were made with four concentrations of sisal, basalt, or Nanofibrillated cellulose fibres (0, 0.2, 0.5, and 0.8%). The results show that air entrainment decreased the unconfined compressive strength (UCS) and yield stress of FB, while the addition of the three types of fibre helped to compensate the UCS and built stronger internal bonds and sound structures, which led to different failure characteristics.

摘要

通过台式叶片粘度计、微型坍落度和压缩试验研究了纤维增强水泥浆回填物 (CPB) 和泡沫回填物 (FB) 的性能。CPB（不夹带空气）和 FB（空气体积百分比为 10、20、30 和 40%）的样品由四种浓度的剑麻、玄武岩或纳米原纤化纤维素纤维（0、0.2、0.5 和 0.8%）制成。结果表明，空气夹带降低了 FB 的无侧限抗压强度 (UCS) 和屈服应力，而三种纤维的加入有助于补偿 UCS 并建立更强的内部键和健全的结构，从而导致不同的破坏特征。