Study on Mechanical Properties of Fractured Cyan Sandstone with Freeze-thaw Damage in Slope under Uniaxial Compression
In order to study the mechanical properties of fractured rock masseson slopes in cold re-gion,freeze-thaw cycles and uniaxial compression tests were conducted on sandstone specimens with differ-ent inclination angles and widths of pre-cracks.The results show that the freeze-thaw cyclehas a great influ-ence on the stress-strain curve of this type of rock,mainly manifested as a greater strain in the closure stage of pores and cracks after freeze-thaw cycles,and its proportion is also higher,while the peak stress decreas-esaccordingly.The peak strength and elastic modulus are linearly positively correlated with the inclination angle and width of the pre-crack,and nonlinear negatively correlated with the freeze-thaw cycle,and the initial freeze-thaw cycles have a more significant deterioration effect on the sandstone.Compared with the pre-crack width,the decrease of pre-crack inclination angle has more obvious deterioration effect on the peak strength and elastic modulus of the specimen.The pre-cracked sandstone specimen mainly manifested as single-inclined plane failure,and with the increase of freeze-thaw cycles,the degree of fracture intensi-fies,resulting in more axial cracks.
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