Creep acoustic emission of rock salt under triaxial compression

To study and analyze the acoustic emission activity characteristics in the first and stable phases of salt creep, a series of triaxial creep compression tests are carried out using MTS815 flex test GT rock mechanics test system and PCI-2 acoustic emission (AE) monitoring system. The results show: under the triaxial condition, the characteristic parameters of AE such as ringing count rate and energy are proportional to the creep rate. The curve tendency of AE characteristic parameters and creep rate are basically the same. Under the constant confining pressure, the higher axial stress can accelerate the creep rate, and the AE activities also increase, which are characterized by the increase of AE incident points, ringing count rate, energy, cumulative ringing count and cumulative energy. At the same time, through the reduction of points of AE events point, it provides a basis for the study on the long-term time strength and creep damage evolution of salt rock. The creep fractal dimension values of AE of rock salt in various periods are calculated using the G-P algorithm. The laws of rise-fall-fluctuation are summarized. It may that provide the basis for studying the stability of the internal damage of rock salt