Experimental Study on the Dynamic Properties of Three Types of Rock at Negative Temperature
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To research the geotechnical engineering in the cold region of western China, three types of rock, a sandstone, a marble, a granite, were selected, and tested at low temperatures using a split Hopkinson pressure bar system. The specimens were tested at temperatures ranging from 25 to − 40 °C to characterize the dynamic mechanical properties of the frozen rock. To qualify this characterization, a Temperature Influence Factor is introduced. The results show that low temperatures have the greatest influence on red sandstone. They influence marble to a lesser degree. The influence of low temperatures on granite is small. In addition to these tests, rocks were tested at − 15 °C and at room temperature to analyze strain rate effects. That study found that the rocks show strain rate effects both at low temperature and at room temperature.
KeywordsFrozen rock Dynamic compressive strength Temperature effect Split Hopkinson pressure bar (SHPB)
This work was supported by the National Key research and Development Program “Deep Resources Exploration and Mining” (No. 2016YFC0600903). The authors also thank the anonymous reviewers for their valuable suggestions and comments.
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