Static and dynamic mechanical properties and deterioration of bedding sandstone subjected to freeze-thaw cycles: considering bedding structure effect.

The bedding rock widely exists in nature and its mechanical properties are complex. In this study, the Φ100 mm split Hopkinson pressure bar (SHPB), freeze-thaw(F-T) cycle test system joint with scanning electron microscope and other facilities are applied to investigate the static characteristics, impact characteristics, and damage microstructure of the bedding rock under freezing and thawing conditions. Our experimental results show that under the F-T cycle conditions, the peak point deteriorating path of the static stress-strain curve and the post-peak strain softening curve of the vertical and parallel bedding sandstone specimens have obvious anisotropic characteristics.