Experimental study on the effect of prefabricated fissures on the creep mechanical properties and acoustic emission characteristics of sandstone under uniaxial compression

This study investigates the effect of prefabricated fissures on creep mechanical strength and acoustic emission (AE) characteristics sandstone. Under same test conditions, indoor uniaxial compression AE tests were performed intact artificially fissured sandstone specimens using a rock rheometer PCI-? tester controlled with an RLJW-2000 microcomputer. The variation strain, long-term strength, number events, ringing count, energy, RA value two then analyzed to determine properties results show that under stress level, instantaneous total strain specimen was larger than corresponding values specimen. exhibited most significant influence specimen, followed by strain. showed least Furthermore, only 37.5% Owing fissures, significantly reduced. In engineering practice, should be noted for potential failure formation. Moreover, as level increases, events also increases. cumulative generated at various levels is higher maximum count 7.3 times energy 3.8 1.5 4.5 affect Finally, tensile main microcracks inside during creep, shear cracks secondary. consisted mixed tension-shear cracks, but mainly fewer tension cracks. correlates well observed internal microcracks, indicating can used characterize fractures in specimens. has guiding significance characterizing type process creep.