Studies on acoustic emission characteristics of sandstone under uniaxial compression

In order to analyze connections of stress-strain diagram and AE parameter during rock failure process under uniaxial compression AE testing,and at the same time,make an analysis about synthesis variables such as accumulated AE events,event rate,energy rate,AE rate versus time.Results indicate that little fracture forms at preliminary stage and larger fracture forms at final stage.Event rate and accumulated AE events have no manifest foreboding information,but AE rate and energy rate are just the opposite.AE location suggests that fractures shift along time from end to central part without any phase of "blank space".AE precursory signal is regarded as an important theory basis to estimate the stability of the rock mass.