| 自然冷却后与实时高温下花岗岩物理力学性质对比试验研究 |
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| 引用本文： | 罗生银,窦斌,田红,陈杰,肖鹏,章诗涛.自然冷却后与实时高温下花岗岩物理力学性质对比试验研究[J].地学前缘,2020,27(1):178-184. |
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| 作者姓名： | 罗生银 窦斌 田红 陈杰 肖鹏 章诗涛 |
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| 作者单位： | 1.中国地质大学(武汉) 工程学院, 湖北 武汉 4300742.中国地质大学(武汉) 国家深部地球钻探与资源开发国际研究中心, 湖北 武汉 430074 |
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| 基金项目： | 国家自然科学基金项目(41674180);国家自然科学基金项目(41602374);中央高校基本科研业务费专项基金项目(1810491A19);中央高校基本科研业务费专项基金项目(CUG2170207) |
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| 摘 要： | 岩石经过高温作用后其物理力学性质的变化,直接影响着干热岩资源的开发利用与地下储层的稳定性。以花岗岩为研究对象,对高温自然冷却后和实时高温下的岩样进行物理性质测试与单轴压缩试验,分析对比试样在不同状态下的物理力学性质变化情况。结果表明:(1)自然冷却后与实时高温下的花岗岩质量随温度升高而减小,体积随温度升高而增大,600 ℃时,质量损失率分别为0.24%、0.27%,体积增加率分别为4.21%、3.53%;(2)两种方式下试样的峰值强度、弹性模量整体上呈现减小趋势,600 ℃时,峰值强度分别降低约49.81%、37.19%,弹性模量分别降低约34.35%、26.13%,峰值应变分别增长约70.43%、39.62%;(3)低于400 ℃时,自然冷却后的试样各物理力学性质弱化情况低于实时高温下的试样,但高于400 ℃时,自然冷却后的试样物理力学性质弱化情况较实时高温下试样更严重,出现了高温拐点。研究结果为实际工程中高温岩石工程的岩石稳定性评价提供理论参考。
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| 关 键 词： | 高温岩石 自然冷却 实时高温 物理性质 力学性质 |
| 收稿时间： | 2019-03-08 |
Comparative experimental study on physical and mechanical properties of granite after natural cooling and under real-time high temperature |
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| LUO Shengyin,DOU Bin,TIAN Hong,CHEN Jie,XIAO Peng,ZHANG Shitao.Comparative experimental study on physical and mechanical properties of granite after natural cooling and under real-time high temperature[J].Earth Science Frontiers,2020,27(1):178-184. |
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| Authors: | LUO Shengyin DOU Bin TIAN Hong CHEN Jie XIAO Peng ZHANG Shitao |
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| Institution: | 1. Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China2. National Center for International Research on Deep Earth Drilling and Resource Development, China University of Geosciences (Wuhan), Wuhan 430074, China |
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| Abstract: | The change of physical and mechanical properties of rock under high temperature has a direct impact on the development and utilization of hot dry rock resources and stability of underground reservoirs. Here, we studied granite through physical property and uniaxial compression testing with high temperature natural cooling and real-time temperature treatments. We analyzed and compared the physical and mechanical property changes of the specimens at different temperatures under the two treatments. The results are as follows: (1) The mass of granite decreased with increasing temperature by 0.24% and 0.27%, respectively, while the volume of granite increased with increasing temperature by 4.21% and 3.53%, respectively, under the two treatments. (2) The peak strength and elastic modulus of the specimens decreased as a whole; at 600 ℃, the peak strength decreased by 49.81% and 37.19%, respectively; elastic modulus decreased by about 34.35% and 26.13%, respectively; and the peak strain increased by 70.43% and 39.62%, respectively. (3) At below 400 ℃, mechanical properties of the specimens weakened less after natural cooling than under real-time temperature treatment, but the trend reversed at temperatures higher than 400 ℃, and a high temperature inflection point appeared. The research results can provide reference for stability evaluation of hot dry rock resources and real-time high temperature rock in practical engineering. |
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| Keywords: | high temperature rock natural cooling real-time temperature physical properties mechanical properties |
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