Journal
ROCK MECHANICS AND ROCK ENGINEERING
Volume 51, Issue 5, Pages 1347-1359Publisher
SPRINGER WIEN
DOI: 10.1007/s00603-018-1407-3
Keywords
Artificial rock bar; Viscoelastic wave propagation; Viscosity coefficient; Numerical simulation
Funding
- National Key Research and Development Program of China [2016YFC0801607]
- National Science Foundation of China [51525402, 51374049, 51574060, 51534003]
- Fundamental Research Funds for the Central Universities of China [N160103005]
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Rocks with microdefects exhibit viscoelastic behavior during stress wave propagation. The viscosity coefficient of the wave can be used to characterize the attenuation as the wave propagates in rock. In this study, a long artificial bar with a readily adjustable viscosity coefficient was fabricated to investigate stress wave attenuation. The viscoelastic behavior of the artificial bar under dynamic loading was investigated, and the initial viscoelastic coefficient was obtained based on the amplitude attenuation of the incident harmonic wave. A one-dimensional wave propagation program was compiled to reproduce the time history of the stress wave measured during the experiments, and the program was well fitted to the Kelvin-Voigt model. The attenuation and dispersion of the stress wave in long artificial viscoelastic bars were quantified to accurately determine the viscoelastic coefficient. Finally, the method used to determine the viscoelastic coefficient of a long artificial bar based on the experiments and numerical simulations was extended to determine the viscoelastic coefficient of a short rock bar. This study provides a new method of determining the viscosity coefficient of rock.
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