The dynamic spalling characteristics of rock are important for stability analysis in rock engineering. This paper presented an experimental investigation on the dynamic spalling characteristics of granite with different temperatures and strain rates. A series of dynamic spalling tests with different impact velocities were conducted on thermally treated granite at different temperatures. The dynamic spalling strengths of granite with different temperatures and strain rates were determined. A model was proposed to correlate the dynamic spalling strength of granite, high temperature and strain rate. The results show that the spalling strength of granite decreases with increasing temperature. Moreover, the spalling strength of granite with a higher strain rate is larger than that with a lower strain rate. The proposed model can describe the relationship among dynamic spalling strength of granite, high temperature and strain rate.

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Keywords: Dynamic spalling characteristics, High temperature, Strain rate, Dynamic loading, Granite