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Experimental study on the instability mechanism of a fractured pillar under eccentric compression
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DOI：10.1016/j.tafmec.2026.105736.png)
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Abstract
En 中文
To investigate the instability mechanism of fractured pillars under eccentric compression, uniaxial eccentric compression tests were conducted on sandstone specimens containing a central through-going fracture. Acoustic emission (AE), digital image correlation (DIC), and nuclear magnetic resonance (NMR) techniques were employed to analyze the mechanical properties and damage evolution of the specimens. The results indicate that: (1) Eccentric compression significantly reduces the load-bearing capacity of fractured pillars. When the eccentric distance increases to = /6, the peak strength and elastic modulus of the specimen decrease by up to 32% and 11%, respectively. (2) Under eccentric loading, the AE cumulative count exhibits a distinct two-stage characteristic, the -value fluctuation increases, and AE events gradually migrate from both fracture ends toward the tensile side and the upper fracture tip, displaying an asymmetric distribution. (3) Eccentric loading exacerbates pore damage in the specimens and enhances pore connectivity. As the eccentric distance increases, the proportion of shear cracks decreases, the proportion of tensile cracks increases, and a localized tensile strain band forms on the left side of the fracture. Numerical simulation further reveals that as the eccentric distance increases, secondary cracks on the eccentric side form arc-shaped shear bands through the specimen ends, while the secondary cracks on the opposite side of the eccentric position gradually transition from shear failure to tensile failure, leading to an ultimate failure mode shift from shear to tensile-shear composite failure. These findings provide a theoretical basis for stability assessment of fractured pillars under eccentric compression.
Keywords:
Fractured pillar
Eccentric loading
Mechanical properties
Acoustic emission
Failure mode
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