冲击载荷作用下高温砂岩动态力学性能试验研究

doi:10.13722/j.cnki.jrme.2018.1299

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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.

Key words： rock dynamics;high temperature sandstone;loading rate;temperature effect;split Hopkinson pressure bar

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	PINQ Qi1
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	WU Mingjing 2
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	YUAN Pu 2
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	ZHANG Huan 2
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Cite this article:

PINQ Qi1,2,3, et al. Experimental study on dynamic mechanical properties of high temperature sandstone under impact loads[J]. , 2019, 38(4): 782-792.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1299 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I4/782

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