Failure mechanisms and influencing factors of mechanical behavior in layered anti-dip slope based on micro-shrinkage rock specimens

Abstract

Anti-dip slopes represent a prevalent slope type in mining engineering. To systematically investigate the influence of various factors on the stability of anti-dip slopes under overburden pressure, this study conducted uniaxial compression tests on micro shrinkage layered anti-dip slope specimens. The analysis was performed on the macroscopic failure mode, stress-strain curves, and displacement fitting curves of the specimens with particular emphasis on examining how different factors affect the failure characteristics and mechanical properties of specimens. The study demonstrated that the interlayer thickness, interlayer angle, and anchorage conditions have different effects on the stability of anti-dip slope, and the bolt support anchorage significantly altered both the failure mode and mechanical properties of slope specimens. NPR bolt exhibited superior performance that enhanced axial load-bearing capacity by 6.12%. Furthermore, it effectively controlled horizontal and vertical displacements by 20.2% and 5.4%, respectively. These findings confirmed that NPR bolts could substantially improve the stability of anti-dip slopes through their exceptional mechanical properties and displacement control capabilities.

Keywords

layered anti-dip slope / uniaxial compression / negative Poisson ratio bolt / failure mechanisms / influence factors

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Central South University