关键词: 单轴, 冲击倾向, 煤岩样, 应力, 纵波波速, 试验关系模型

Abstract:   To explore the mechanism of rockburst，we established the experimental model between stress and P-wave velocity for burst tendency coal and rock samples from deep coal mine under the uniaxial loadings，and analyzed the parameters of the derived model．The results show that：1) the P wave velocity in rock sample changes more sensitively than that in coal sample under loadings，which means the P wave velocity in rock sample changes more quicker with the increase of stress；2) the velocity gradient of the sample is usually high at the elastic stage and then begins to level out at the plastic stage under the uniaxial loading，which shows that a power function is exist between the P-wave velocity and stress．The calculated correlation coefficients to measured value show that the experimental model has high fitness，and can be well used to describe the stress distribution and identify the risk level of rockburst in mines．

Key words: uniaxial, burst tendency, coal-rock sample, stress, P-wave velocity, experimental model