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Study on the macro-meso-micro mechanical response mechanisms of green sandstone with different fracture spatial configurations under freeze-thaw cycles and cyclic loading
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DOI：10.1016/j.tafmec.2026.105759.png)
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Abstract
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Based on the engineering background where slope rock masses in western cold-region open-pit mines are subjected to long-term freeze-thaw cycles and cyclic loading, this study takes green sandstone specimens with different fracture spatial configurations as the research object. Forced water saturation and freeze-thaw pretreatment tests, followed by uniaxial compression and cyclic loading-unloading mechanical tests, were conducted sequentially. By comprehensively utilizing Digital Image Correlation (DIC), Computed Tomography (CT), and Scanning Electron Microscopy (SEM) technologies, a macro-meso-micro multiscale analytical framework was constructed from an experimental perspective. The study systematically explored the cross-scale degradation mechanism of fractured rock masses and discussed the influence and implications of different fracture spatial configurations on cold-region rock engineering construction. The results indicate that, macroscopically, freeze-thaw damage significantly weakens the ultimate bearing capacity and deformation resistance of the specimens, leading to a notable decrease in peak strength and elastic modulus, while accelerating the accumulation of fatigue damage and the growth of irreversible strain. Under the coupled effect of freeze-thaw damage and fatigue damage, the energy allocation mechanism of the specimens changed, with the energy storage limit decreasing and the proportion of dissipated energy significantly increasing. Mesoscopically, freeze-thaw damage significantly alters the strain localization characteristics on the specimen surface. Freeze-thaw cycles and fracture spatial configurations jointly govern the three-dimensional fracture morphology of the fractured rock mass, causing a substantial increase in the fracture area, volume, and fractal dimension of freeze-thaw specimens. Microscopically, the primary fracture mode of the specimens shifts from intergranular fracture under uniaxial compression to transgranular fracture under cyclic loading-unloading. The freeze-thaw specimens exhibit pronounced transgranular fracture features. The research results of this paper can provide significant reference value for rock engineering construction and disaster prevention in cold regions.
Keywords:
Freeze-thaw cycles
Cyclic loading
Fractured rock mass
Spatial configuration
Dissipated energy
Transgranular fracture
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