Effects of confining pressure and loading direction on the mechanical behavior of schist with high content and aggregation degree of mica
Qiliang Liu, Jing Xiang, Xiaomeng Yin, Kun Song
TL;DR
This study examines how mica content and pressure affect the mechanical behavior of schist, important for tunnel engineering stability.
Contribution
The paper reveals how confining pressure and loading direction influence the mechanical anisotropy of mica-rich schist.
Findings
Peak strength and elastic modulus of schist vary with orientation angle under uniaxial compression.
Confining pressure reduces anisotropy, transitioning rock behavior from anisotropic to isotropic at a critical pressure.
Failure modes change with increasing pressure and orientation angle, influenced by microstructure differences.
Abstract
This article focuses on the mechanical anisotropy of the schist with high content and aggregation degree of mica, which are prone to causing local collapse, large deformation, and support failure in tunnel engineering. The fabric characteristics of rock and the response of mechanical properties to confining pressure and loading direction was emphatically explored by micro tests and compression tests with confining pressures ranging from 0 to 20 MPa. Micro tests reveal that the flaky micas are highly aggregated and directionally arranged in the “matrix” composed of granular minerals and directional cracks are developed along the cleavage or the boundaries of mica. Mechanical tests indicate that the peak strength and elastic modulus of schist subjected to uniaxial compression vary in a shoulder form and U-shaped form with the orientation angle α, respectively. The confining pressure σ3…
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Taxonomy
TopicsRock Mechanics and Modeling · High-pressure geophysics and materials · Tunneling and Rock Mechanics