Bearing characteristics and fatigue damage mechanism of multi-pillar system subjected to different cyclic loads

Abstract

Aiming to investigate the fatigue damage mechanism and bearing characteristics of multi-pillar system under cyclic loading, a series of axial cyclic loading tests with different cyclic amplitudes were carried out on triple-pillar marble specimens. The acoustic emission (AE) and digital image correlation (DIC) were jointly applied to monitoring and recording damage evolution and failure behavior of each pillar, which reproduced the cataclysmic instability process of underground pillar groups. Experimental results indicated that the cyclic amplitude exceeding the threshold of damage initiation weakened the resistance to deformation, resulting in obvious release of dissipated energy and the reduction of bearing capacity. Conversely, after low-amplitude cyclic loading, both the pre-peak bearing capacity and the post-peak ductility of the pillar system increased due to the compaction of initial defects, indicating that the peak bearing capacity was closely related to the extent of pre-peak fatigue damage. The axial strain of each pillar was measured by DIC virtual extensometer to present the damage extent during cyclic loading phase. Meanwhile, fracture evolution of typical load drop points was also characterized by transverse strain fields (ε_xx), and observations showed that the damage extent of key pillar undergoing high-amplitude cyclic loads was more serious and violent, accompanied by the ejection of rock debris and loud noises.

Keywords

multi-pillar system / cyclic loading / fatigue damage / bearing characteristics / acoustic emission (AE) / digital image correlation (DIC)

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