干湿循环下类岩石的声发射特征研究OA

To investigate the effects of wet-dry cycles on the mechanical properties and damage mechanisms of rock-like materials,uniaxial compression and acoustic emission tests were conducted on rock-like speci-mens subjected to different numbers of wet-dry cycles.The stress-strain relationship,elastic modulus,uni-axial compressive strength,and acoustic emission parameters of the specimens were systematically analyzed.The results indicate that as the number of cycles increases,the compressive strength,elastic modulus,and cumulative acoustic emission ring-down counts of the specimens show a declining trend.The degradation rates of compressive strength and elastic modulus were 27.9%and 40.1%,respectively,indicating that the elastic modulus parameter is more sensitive to damage than the compressive strength parameter.The cumula-tive ring-down counts decreased by over 60%with increasing cycle numbers,which can serve as a precur-sor characteristic for specimen instability and failure.The sudden drop in the acoustic emission b-value can also be regarded as a precursor to rupture.The failure mode of the specimens gradually transitioned from tensile failure to shear failure.The findings provide data support for real-time monitoring of rock mass dam-age evolution in wet-dry alternating environments.