Study On Acoustic Emission Test And Impact Tendency In The Failure Process Of Coal Rock Sample

Rockburst is a major mine disaster that affects the exploitation of deep coal resources in China.Increasing the accuracy of rockburst disaster prediction and prediction has gradually become one of the main technical problems that need to be solved in domestic coal mine safety production.As coal mines enter deep mining,the dynamic disasters of coal and rock become more serious and the types of disasters become more complex and diverse.However,in general,the areas where dynamic disasters occur cannot be accurately determined,making it more difficult to obtain precursory information.Therefore,in this paper,the acoustic emission experiment is carried out on the uniaxial compression failure of different coal samples,combined with theoretical analysis and experimental analysis,the evolution of the seismic source location during deformation and failure of different types of coal and rock samples,and analysis of the energy before the peak can be inferred The tendency of the impact of the impact,further reveals the characteristics of the acoustic emission precursor information of the ground pressure,and provides a certain theoretical basis for the prevention and control of coal mine dynamic disasters.Acoustic emission signal collection and processing in the whole process of sample destruction,the corresponding relationship between the seismic source location and the energy release in different periods of the sample was systematically analyzed,and combined with the sample destruction During the stress-strain curve of the process,an energy correlation index KAF was proposed to determine the impact tendency of the sample.By comparing the current indicators for judging impact tendency,it is concluded that it is effective.The classification criterion of energy correlation index is divided.A new judgment index is used to judge the impact tendency of coal and rock samples,and the ambiguity of the impact tendency of the sample is determined based on a single index.For each of the four criteria,a Gaussian membership function and a fuzzy evaluation vector were constructed based on the fuzzy comprehensive evaluation method.The weights corresponding to the indicators were determined.The impact tendency of coal and rock samples was redetermined to avoid a single indicator Vagueness of predictions.In this paper,there are 37 figures,10 tables,88 references...