Research on stress state and energy evolution of acoustic emission signal during rock materials fracture process
The energy is continuously accumulated and released during the process of rock frac-ture under load.And the meso-fabric characteristics of rock materials,such as inhomogeneity,have significant effects on the acoustic emission generated by fracture.The evaluation methods of strength and energy parameters of different heterogeneous and inhomogeneous rocks were established by rock mechanics test,and the relationship between acoustic emission characteris-tics and stress state and energy background of different heterogeneous rocks was analyzed.The results show that:The rocks have different strength components ruptured at different stress stages,and the acoustic emission signals generated by different stress levels are caused by the rupture of different components.After the rupture damage of rocks,the residual energy is re-lated to the total energy and energy drop.The elastic wave energy monitored by acoustic emis-sion is the main part of the energy drop,which is related to the stress state and material prop-erties.The siltstones are divided into three categories:homogeneous and uniform,heterogene-ous but uniform,heterogeneous and inhomogeneous.The rock with different heterogeneous and inhomogeneous has different fracture and energy release at different stress states,among which homogeneous and uniform rock has the highest strength and energy storage level.The theory of stress state and energy background discrimination based on acoustic emission can be applied to the analysis of microseismic monitoring data in engineering,which provides a theoretical basis for identifying the critical state of rock masses in the mining process and early warning.
mining rock mechanicsacoustic emissionrupture processstress stagecritical stateenergy level
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