The fractal characteristics of the rock-burst debris of specimens under different combined hydraulic-pneumatic gradient stress loading conditions
In order to study the characteristics of rock-burst debris generated by rock mass under different loading paths,a series of gradient loading rock-burst tests were carried out on large-scale specimens using a large-scale true triaxial gradient and hy-draulic-pneumatic rock-burst simulation experimental device which was independent-ly developed.Observing the macroscopic phenomena of specimen failure after rock-burst,and statistical analysis of the quality,quantity and partical size of rock-burst debris,calculating the fractal dimension of rock-burst debris under different gradient loadings by particle size-quantity and particle size-mass method.The results showed:①The rock-burst phenomena which had been generated by the rock masses under the same loading environment and the different top gradient loading conditions were very different,as the top loading gradients of the specimen increased,the thro-wing distance of rock-burst debris became longer,the intensity of rock-burst became larger.②It was found that under different gradient loadings,the size and mass distribu-tion characteristics of rock-burst debris had varied.The larger the top gradient load-ing,the greater the proportion of large particle size debris,the less the quality of deb-ris,explain that the less insufficient the damage caused by rock-burst debris.③The rock-burst debris of the large-diameter specimens under different gradients had dis-played fractal features.It could be seen that the larger the top loading gradients were,the smaller the fractal dimension would be,the smaller the fractal dimension of the rock-burst would be,and the less energy would be consumed when rock-burst oc-cured,more energy was released in the form of debris splashes.
gradient loading rock-burst debris energy consumption fractal di-mensions
LIN Manqing HE Jiaqi LIU Xiqi CHI Ruan ZHANG Dianji ZHANG Lan
The School of Xingfa Mining Engineering,Wuhan Institute of Technology,Wuhan,Hubei 430062,China The School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan,Hubei 430070,C
国内会议
太原
英文
440-458
2019-10-01（万方平台首次上网日期，不代表论文的发表时间）