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

doi:10.13745/j.esf.2020.1.19

地学前缘 ›› 2020, Vol. 27 ›› Issue (1): 178-184.DOI: 10.13745/j.esf.2020.1.19

• 地热开发利用模拟和实践 • 上一篇下一篇

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

罗生银(), 窦斌^*(), 田红, 陈杰, 肖鹏, 章诗涛

1.中国地质大学(武汉) 工程学院, 湖北武汉 430074
2.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

收稿日期:2019-03-08 修回日期:2019-04-29 出版日期:2020-01-20 发布日期:2020-01-20
通讯作者: 窦斌
作者简介:罗生银(1995-),男,硕士研究生,主要从事干热岩地热钻采方面研究。E-mail: 1174111784@qq.com
基金资助:
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)

Comparative experimental study on physical and mechanical properties of granite after natural cooling and under real-time high temperature

LUO Shengyin(), DOU Bin^*(), TIAN Hong, CHEN Jie, XIAO Peng, ZHANG Shitao

1. Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China
2. National Center for International Research on Deep Earth Drilling and Resource Development, China University of Geosciences (Wuhan), Wuhan 430074, China

Received:2019-03-08 Revised:2019-04-29 Online:2020-01-20 Published:2020-01-20
Contact: DOU Bin

摘要/Abstract

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。

关键词: 高温岩石, 自然冷却, 实时高温, 物理性质, 力学性质

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.

Key words: high temperature rock, natural cooling, real-time temperature, physical properties, mechanical properties

中图分类号:

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.

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.

图/表 10

图1 花岗岩岩样

Fig.1 Granite specimen

表1 试样分组

Table 1 Grouping of specimens

试样分组	温度/℃	试样数量
T₁	25	3
T₂	200	6
T₃	300	6
T₄	400	6
T₅	500	6
T₆	600	6

图2 质量损失率与温度的关系曲线

Fig.2 Relationship between mass loss rate and temperature

图3 体积增加率与温度的关系曲线

Fig.3 Relationship between volume increase rate and temperature

图4 密度变化率与温度的关系曲线

Fig.4 Relationship between density change rate and temperature

图5 纵波波速与温度的关系曲线

Fig.5 Relationship between p-wave velocity and temperature

图6 自然冷却后与实时温度下花岗岩的应力-应变曲线 a—自然冷却;b—实时高温。

Fig.6 The stress-strain curves of granites after natural cooling and under real-time temperature

图7 峰值强度与温度的关系曲线

Fig.7 Relationship between peak strength and temperature

图8 弹性模量与温度的关系曲线

Fig.8 Relationship between elastic modulus and temperature

图9 峰值应变与温度的关系曲线

Fig.9 Relationship between peak strain and temperature

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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

Comparative experimental study on physical and mechanical properties of granite after natural cooling and under real-time high temperature

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