Experimental study on dynamic mechanical properties of high temperature sandstone under impact loads
PINQ Qi1，2，3，WU Mingjing 2，3，YUAN Pu 2，3，ZHANG Huan 2，3
(1. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mine，Anhui University of Science and Technology，Huainan，Anhui 232001，China；2. Engineering Research Center of Mine Underground Projects，Ministry of Education，Anhui University of Science and Technology，Huainan，Anhui 232001，China；3. School of Civil Engineering and Architecture，Anhui University of Science and Technology，Huainan，Anhui 232001，China)
Abstract：To investigate the dynamic properties of sandstone under high temperature，impact compression tests at 6 loading rates were carried out under different temperatures of 25 ℃，200 ℃，400 ℃，600 ℃，800 ℃ and 1 000 ℃ using variable cross-section split Hopkinson pressure bar test apparatus and high temperature equipment. Test results show that there shows a positive quadratic function relationship between the dynamic peak stress and the loading rate. Strengthen effect of the temperature on the dynamic peak stress appears in the range of 200 ℃ to 800 ℃，which is most obvious at 200 ℃，while the dynamic peak stress is weaken at 1 000 ℃. There is also a positive quadratic function relationship between the dynamic peak strain and the loading rate. The effect of the temperature on the dynamic peak strain is inconspicuous from 200 ℃ to 600 ℃，but is remarkable at 800 ℃，especially at 1 000 ℃. The dynamic elastic modulus decreases with rising the temperature but is almost independent of the loading rate. The dynamic elastic modulus varies in a certain range from 200 ℃ to 600 ℃，while has a smaller change at 800 ℃ and 1 000 ℃. With increasing temperature，the failure mode presents a transformation from brittle failure to ductile-brittle failure. The bigger the loading rate is，the more the fracture surfaces are，the worse the broken degree is，and the smaller the fracture fragments are. At 1 000 ℃，fracture effect is more remarkable in a larger loading rate.
平 琦1，2，3，吴明静2，3，袁 璞2，3，张 欢2，3. 冲击载荷作用下高温砂岩动态力学性能试验研究[J]. 岩石力学与工程学报, 2019, 38(4): 782-792.
PINQ Qi1，2，3，WU Mingjing 2，3，YUAN Pu 2，3，ZHANG Huan 2，3. Experimental study on dynamic mechanical properties of high temperature sandstone under impact loads. , 2019, 38(4): 782-792.
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2019, Vol. 38 
