Akademik Veri Yönetim Sistemi
POWDER TECHNOLOGY, cilt.471, 2026 (SCI-Expanded, Scopus)
Reinforcement behavior is of great importance for underground backfill systems, as all applied loads act upon it. Three kinds of steel fibers, namely, Hooked-End type (HE), Melt-Extracted type (ME) and Crimped type (C) with a dosage of 2.0 %, were used to prepare CTB specimens with 70 wt% solids and 1:4 binder/tail rate. Uniaxial compression experiments were adopted to assess macroscopic strength features of steel fiber-reinforced tungsten tails cemented backfill (SFCTB). X-ray computed tomography (CT) scanning technique was employed to inspect impacts of porosity, fracture features, and incorporation of diverse types of steel fibers on CTB's strength. Lab results indicate that incorporating steel fibers may augment structure of pores and effectively progress their morphologies. Adding HE and ME steel fibers can hinder fracture development and enhance the bearing capacity of SFCTB, but it leads to an increase in fracture volume by 0.84 % and 0.76 % respectively. In contrast, C steel fibers reduce the fracture volume by 0.47 %, significantly inhibiting fracture propagation and improving compressive strength. The incorporation of HE and C steel fibers decreases the 3D porosity (P3D) by 0.054 % and 0.046 % respectively, while adding ME steel fibers rises P3D by 0.372 %. Key factors such as porosity, crack distribution, and the 3D fractal dimension influence SFCTB's strength features to varying degrees. This study employs CT technology and 3D images to achieve quantitative and visual characterization of the spatial distribution of pores, fractures, and SFCTB after failure. It provides a novel approach for revealing the microscopic mechanism underlying the mechanical properties of SFCTB.