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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摘要

利用分离式霍普金森压杆(SHPB)装置研究不同温度处理后深部砂岩的动态及损伤特性，并对砂岩经历－15 ℃～800 ℃作用后的动态应力、应变、应变率、分形维数、破坏模式及损伤度随温度变化的规律进行分析。结果表明：在－15 ℃～800 ℃温度范围内，20 ℃是随温度变化的分界点，其中，－15 ℃～20 ℃时砂岩的动态峰值应力随着温度的升高不断增加，0 ℃时出现转折点；20 ℃～800 ℃时砂岩的动态峰值应力随着温度的升高不断下降，600 ℃后峰值强度急剧下降。试验数据表明温度处理后的砂岩动态特性表现出较强的应变率效应，其破坏模式主要为劈裂拉伸破坏及压碎破坏，砂岩的损伤演化过程受温度影响较大。

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	张蓉蓉1
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关键词 ：岩石力学, SHPB, 温度, 动态特性, 分形维数, 损伤度

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

引用本文:

张蓉蓉1，2. 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[J]. 岩石力学与工程学报, 2018, 37(S2): 3879-3890.
ZHANG Rongrong1，2. Test and analysis of dynamic mechanics and damage characteristics of deep sandstone after different temperatures. , 2018, 37(S2): 3879-3890.

链接本文:

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

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