关键词: 灰岩, 蠕变破坏, 声发射试验

Abstract: The acoustic emission test of the deep limestone creep deformation of the mine is conducted,so as to study the acoustic emission characteristics of the creep deformation of limestone under different stress level conditions.The study results show that in the early stage of permanent loading,the variation of acoustic emission parameters is relatively active,Possion ratio of limestone also fluctuates greatly;after entering the stage of long-term constant creep deformation,acoustic emission parameters and Possion ratio of limestone fluctuate less;when the loading stress reaches about 90% of the uniaxial compressive strength of limestone,surge phenomenon of the acoustic emission parameters of limestone is appeared.The above study results further show that according to the variation characteristics of acoustic emission parameters and the strain characteristics of limestone in different creep deformation stages,the creep failure of limestone can be predicted to a certain extent.

Key words: Limestone, Creep failure, Acoustic emission test