Behaviour of FRP -confined mine pillar under compressive loading: Laboratory tests

Behaviour of FRP -confined mine pillar under compressive loading: Laboratory tests

Ensuring mine pillar stability is essential for underground mining operations. This study systematically evaluates four pillar optimization methods via uniaxial compression tests, analyzing mechanical effects using acoustic emission (AE) monitoring and digital image correlation (DIC). Key findings o...

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Bibliographic Details
Main Authors: Honglin Liu, Jiajie Tian, Yang Xia, Qinlong Ran, Hongchao Zhao
Format: Article
Language:English
Published: Elsevier 2025-09-01
Series:Results in Engineering
Subjects:
Uniaxial compression
Pillar structure
Fiber-confined polymers
Acoustic emission
Mechanical response
Online Access:http://www.sciencedirect.com/science/article/pii/S2590123025026775
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Summary:Ensuring mine pillar stability is essential for underground mining operations. This study systematically evaluates four pillar optimization methods via uniaxial compression tests, analyzing mechanical effects using acoustic emission (AE) monitoring and digital image correlation (DIC). Key findings obtained from this research indicate that: (1) FRP-confined high-water material prismatic specimens (UPFW) exhibit dual-peak mechanical behavior with high axial strain capacity (14 %–16 %). Compared to unconfined prismatic specimens (UPF), high-water material effectively coordinates stress-strain distribution between mine pillars and external FRP containers; (2) FRP-confined specimen failure modes are highly shape-sensitive. UPF specimens show localized tensile fractures with rapid crack propagation from stress concentration, whereas FRP cylindrical specimens (UCF) display smoother FRP rupture surfaces and 29° tensile-shear failure in rock cores; (3) Both UPF and UPFW exhibit multi-peak behavior, transitioning from rock-core-dominated initial peaks to FRP-dependent subsequent peaks, where cross-section geometry and high-water material critically influence post-peak performance; (4) All UW, UPW, and UCF specimens develop characteristic V-shaped displacement zones during failure but exhibit distinct damage evolution patterns, revealing FRP confinement’s critical role in regulating V-zone formation by altering damage propagation paths and energy release behaviors.
ISSN:2590-1230

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