Experimental investigation on the frequency-spectrum characteristic of stress wave propagation through thermally treated granite

The propagation properties of stress waves in rock masses are significantly affected by high temperature. This paper presents an experimental investigation on the frequency-spectrum characteristics of stress waves in hightemperature granites. The pendulum impact test was performed on high-temperature granite bars to generate stress waves. The frequency-spectrum variation of stress waves in high-temperature granites was investigated by adopting the discrete Fourier transform. The effects of temperature on both the spectral attenuation ratio and the average energy dissipation rate of the harmonic wave were discussed. The results show that frequency spectra of stress waves occur attenuation when stress waves propagate in high-temperature granites. The frequencyspectrum attenuation is more obvious in the granite with higher temperature. Moreover, the spectral attenuation ratio and the average energy dissipation rate of the harmonic wave are significantly affected by the high temperature. The spectral attenuation ratio and the average energy dissipation rate of the harmonic wave increase as temperature increases.