不同温度处理后深部砂岩动态力学及损伤特性试验与分析

doi:10.13722/j.cnki.jrme.2018.0181

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Abstract

Dynamic mechanics and damage characteristics of deep sandstone after different temperature treatments in impact failure process were studied using split Hopkinson pressure bar(SHPB) system. The variations of dynamic mechanical parameters(such as dynamic stress，strain，strain rate，fractal dimension，failure mode and damage degree) of deep rock with temperature were analyzed. Test results show that 20 ℃ is the turning point of dynamic mechanical parameters with the temperature range from －15 ℃ to 800 ℃. The dynamic peak stress of sandstone increases with the increase of temperature from －15 ℃ to 20 ℃， and the corresponding inflection point appears at 0 ℃. Meanwhile，the dynamic peak stress decreases with the increase of treatment temperature from 200 ℃ to 800 ℃，furthermore，it decreases sharply when the temperature over 600 ℃. The experimental data shows that there is an obviously strain rate effect for test sandstone after different temperature treatments，and the failure modes of samples are two typical kinds：splitting failure and crushing failure. Additionally，the temperature has significant effect on the damage evolution process of sandstone.

Key words： rock mechanics SHPB temperature dynamic characteristics fractal dimension damage degree

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	ZHANG Rongrong1
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Cite this article:

ZHANG Rongrong1,2. Test and analysis of dynamic mechanics and damage characteristics of deep sandstone after different temperatures[J]. , 2018, 37(S2): 3879-3890.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0181 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/3879

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