Mechanical Properties of Fractured Granite with Different Dip Angle Under Triaxial Compression
Conventional triaxial compression tests were conducted on fractured granite with different dip angles,and the entire process was monitored using an Acoustic Emission(AE)system.The mechanical and acoustic emission characteristics of the failure process were studied.The results showed that the stress-strain curve characteristics of the rock were significantly affected by the fractures,and the fractured rock samples experienced significant local stress fluctuations and multiple stress drops during the fracture process,weakening their brittle characteristics.Cracks disrupt the structural integrity of rocks,leading to a decrease in resistance to failure,with a reduction rate of up to 41.4%;As the inclination angle of the cracks increases from 0°to 90°,the compressive strength of granite shows a trend of first decreasing and then increasing;The presence of cracks increases the heterogeneity of rock samples and promotes a decrease in their elastic modulus.The failure modes of fractured rock samples are"through cutting fracture surface failure"and"shear failure along fracture surface",which mainly depend on the angle between the fracture surface and the maximum principal stress.The inclination angle of fractures affects the variation pattern of AE signals during the fracturing process of fractured rocks,especially for rock samples with 30°,45°,and 60°inclination angles.The AE ringing count shows a significant"migration"phenomenon,and the signal concentration distribution area widens and moves backwards;As the dip angle increases,the degree of rock fracture activity shows a trend of first decreasing and then increasing.
rock mechanicscrack inclination angletriaxial compressionmechanical prop-ertiesacoustic emission characteristics
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维普
