关键词: 声发射, 岩爆, 测试, 预判, Eq/E

Abstract: Estimation of rockburst grade is an important basis for the early warning of rockburst disaster,but the complexity of rockburst itself brings great difficulties to the estimation of rockburst.In order to realize the rapid and accurate estimation of rockburst grade,the AE (acoustic emission) testing technology was adopted to obtain the AE features of standard rock samples (50 mm in diameter and 100 mm in height) in different directions (longitudinal,oblique and transverse) during the indoor uniaxial compression loading process.Using the ratio of the cumulative AE energy Eq before the main fracture to the cumulative AE energy E after the final fracture of samples in different directions,the corresponding new criteria for estimating the rockburst grade was proposed respectively,and the estimation results were compared with the actual rockburst grade and the estimation results of the traditional rockburst estimation criteria.It shows that the estimation accuracy of the criterion based on Eq/E of samples from different directions reaches 80%,which is in good agreement with the actual rockburst grade.Compared with the traditional rockburst estimation criterion,the estimation results of Eq/Ebased rockburst estimation criterion are more reliable.When Eq/E of samples with different directions is used to estimate the rockburst grade,the reliability of the estimated results from high to low is longitudinal,oblique and transverse.The results presented herein have certain reference value for the prevention and control of rockburst disaster.

Key words: acoustic emission,rockburst,test,estimation, Eq/E