Geomechanics and Engineering

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Evolution of dynamic mechanical properties of heated granite subjected to rapid cooling

  • Yin, Tubing (School of Resources and Safety Engineering, Central South University) ;
  • Zhang, Shuaishuai (School of Resources and Safety Engineering, Central South University) ;
  • Li, Xibing (School of Resources and Safety Engineering, Central South University) ;
  • Bai, Lv (School of Resources and Safety Engineering, Central South University)
  • Received : 2018.03.29
  • Accepted : 2018.09.13
  • Published : 2018.12.10
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Abstract

Experimental study of the deterioration of high-temperature rock subjected to rapid cooling is essential for thermal engineering applications. To evaluate the influence of thermal shock on heated granite with different temperatures, laboratory tests were conducted to record the changes in the physical properties of granite specimens and the dynamic mechanical characteristics of granite after rapid cooling were experimentally investigated by using a split Hopkinson pressure bar (SHPB). The results indicate that there are threshold temperatures ($500-600^{\circ}C$) for variations in density, porosity, and P-wave velocity of granite with increasing treatment temperature. The stress-strain curves of $500-1000^{\circ}C$ show the brittle-plastic transition of tested granite specimens. It was also found that in the temperature range of $200-400^{\circ}C$, the through-cracks induced by rapid cooling have a decisive influence on the failure pattern of rock specimens under dynamic load. Moreover, the increase of crack density due to higher treatment temperature will result in the dilution of thermal shock effect for the rocks at temperatures above $500^{\circ}C$. Eventually, a fitting formula was established to relate the dynamic peak strength of pretreated granite to the crack density, which is the exponential function.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Hunan Provincial Natural Science Foundation of China

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