Infrasound characteristics of cemented tailing filling material under uniaxial compression

The stability of cemented tailing filling body plays a great role in underground mining as bearing body.In recent years, some scholars have carried out experimental research on infrasound signals in the process of rock deformation and failure, but there are few reports about the infrasound signals of cemented tailing filling body.Therefore, the infrasound tests of cemented tailing filling material were carried out in this study.The specimens with three cement-tailing ratios were prepared and carried out infrasound tests under uniaxial compression by using RMT-150C instrument.Initially, the mechanical properties of cemented tailing filling material in the whole process were studied.In addition, the characteristics of infrasound signal energy rate, cumulative energy rate, fractal dimension of energy rate correlation, dominant frequency and frequency band energy in the whole process were also studied.The results show that ① the relative axial strain level at the yield strength point and the peak stress increase, however, the relative axial stress level at the yield strength point and the peak strain decrease with the increase of cement-tailing ratio.② Infrasound signals are generated in the whole process of uniaxial compression for cemented tailing filling material with different cement-tailing ratios.The energy rate of infrasound signals increases sharply near the yield strength point.With the decrease of cement-tailing ratio, the relative stress level increase at the point of infrasound signal energy rate increases sharply.③ The relevant fractal dimensions of infrasound signal energy rate were obtained by using G-P algorithm.The minimum values of the relevant fractal dimensions of infrasound signal energy rate appear after the yield strength point.With the decrease of cement-tailing ratio, the relative stress level increases at the point of the minimum values of the relevant fractal dimensions.④ There is no correlation between the dominant frequency of infrasound signal and cement-tailing ratio.The dominant frequency distribution focuses on the 0-4 Hz before the peak stress.The regularities of the energy proportions of dominant frequency bands (0-1.25, 1.25-2.50, 2.50-3.75 Hz) with different cement-tailing ratios are very similar.The energy proportion rises to the highest value with the frequency band from 0 to 1.25 Hz and decreases to the lowest value with the frequency band from 2.50 Hz to 3.75 Hz before the peak stress.