Ae Characteristics Comparative Analysis Of Rock And Backfill Under Uniaxial Compression

In order to study the AE characteristics of rock and backfill, similarities and differencesbetween them, obtained the mechanical parameteres、AE parameters and waveform datathrough the acoustic emission experiment of sandstone, phyllite, cemented tailings backfilland waste rock cemented tailings backfill under uniaxial compression. Calculated the AEb-value of sandstone, phyllite，cemented tailings backfill and waste rock cemented tailingsbackfill, what’s more, analysed the change characteristics in the whole failure process bycombining with the accumulative count curve and AE rate,compared the change trend of AEb-value in different stress levels by peak stress ratio. Demonstrated AE parameters had thefractal features and confirmed the value of phase space dimension m, besides, studied thechanges of fractal dimension D of AE parameters in different stress levels，at the same time，compared the change trend of fractal dimension D through peak stress ratio. at the same time,the suggestion that how to choose the AE parameters when we forecasted the failure ofsandstone, phyllite，cemented tailings backfill and waste rock was given. Extracted acousticemission signals of sandstone, phyllite，cemented tailings backfill and waste rock cementedtailings backfill in the destructional phase, decomposed these acoustic emission signals byEMD, and compared IMF characteristics from the aspect of correlation coefficient, energyand dominant frequency, The main conclusions are:(1) AE b-value of sandstone, phyllite, cemented tailings backfill and waste rockcemented tailings backfill were changed within a low level, but significantly reduced on thestress-level of over95%of the peak stress.(2) AE rates of sandstone, phyllite and waste rock cemented tailings backfill increasedobviously when the stress near to the peak value, however, AE rates of waste rock cementedtailings backfill decreased to a certain extent, namely tranquil period.(3) All the AE parameters of sandstone, phyllite, cemented tailings backfill and wasterock cemented tailings backfill had the fractal features.(4) According to the change trend of fractal dimension, when we choosed the AEparameters to forecast failure of test-pieces, for sandstone, the preference in turn was fractaldimension of energy, amplitude, counts; for phyllite, cemented tailings backfill and wasterock cemented tailings backfill, the preference in turn was fractal dimension of energy, counts,amplitude. (5) For the AE singals of sandstone, phyllite, cemented tailings backfill and waste rockcemented tailings backfill in the destructional phase, the IMF components energywas mainlyconcentrated on the first, the first two, the first fine and the first four respectively.(6) The IMF components dominant frequency of sandstone, phyllite, cemented tailingsbackfill and waste rock cemented tailings backfill decreased with decomposing, furthermore,the first IMF’s dominant frequency of sandstone and cemented tailings backfill was higher, allof them were above150kHz.(7) The relevancy between the first IMF and the original signal of sandstone, phyllite,cemented tailings backfill was better, and their correlation coefficients were all above0.75;However, the relevancy of waste rock cemented tailings backfill was bad, thecorrelation coefficients were less than0.2, but, its relevancy of the second IMF was well, itscorrelation coefficients were more than0.8.