不同冷却方式下高温花岗岩巴西劈裂及声发射特性试验研究

王亚超; 窦斌; 喻勇; 郑君; 田红; 刘贺娟

doi:10.19509/j.cnki.dzkq.2021.0028

不同冷却方式下高温花岗岩巴西劈裂及声发射特性试验研究

doi: 10.19509/j.cnki.dzkq.2021.0028

王亚超^1,,
窦斌¹,
喻勇¹,
郑君^1, ,,
田红¹,
刘贺娟²

基金项目:

国家重点研发计划 2019YFB1504204

中国地质大学2019—2020学年度教学实验室开放基金资助项目 SKJ2019075

国家自然科学基金项目 41674180

详细信息

作者简介:
王亚超(1997—)，男，现正攻读地质工程专业硕士学位，主要从事地热能开发利用工作。E-mail: 743657451@qq.com

通讯作者:
郑君(1987—)，女，副教授，主要从事地热能开发利用以及钻进自动化研究及教学工作。E-mail: junzheng@cug.edu.cn

中图分类号: P588.13⁺1
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出版历程
- 收稿日期: 2021-05-23

Experimental study on Brazilian split test and acoustic emission characteristics of high temperature granite under different cooling methods

摘要

摘要:
干热岩地热开发中的钻井、储层压裂及热交换等环节均涉及高温岩石冷却的问题，为揭示其中岩石损伤演化规律，基于巴西劈裂试验和声发射技术，研究了不同高温及冷却方式对花岗岩抗拉性质的影响。结果表明：①25~600℃下花岗岩抗拉强度随温度升高而下降，遇水冷却使抗拉强度进-步下降并使其开始大幅下降的温度阈值提前到200，500℃后抗拉强度对遇水冷却更敏感。②荷载达到峰值，声发射累计振铃计数突增，岩样内形成断裂区；受遇水冷却影响，岩样的振铃计数峰值和能量峰值有所下降，间接反映岩石内裂纹更发育，200~300℃时降幅均较大，300℃时和500℃后花岗岩对热处理方式较敏感。③花岗岩破裂面随温度升高由平整向粗糙曲折变化，由脆性向延性转变，遇水冷却促进岩石破裂并促使脆性向延性转变的温度区间提前。研究结果为地热开采中高温岩石的稳定性评价提供理论参考。
- 高温花岗岩 /
- 冷却方式 /
- 巴西劈裂 /
- 声发射 /
- 热损伤
Abstract:
High-temperature rock cooling can occur in the whole process of the drilling, fracturing, and heat exchange during the geothermal energy exploitation in hot dry rock. To reveal the evolution law of rock damage, based on the Brazilian splitting test and acoustic emission technology, the effects of different high temperatures and cooling methods on the tensile properties of granite were studied. The results showed that: ①The tensile strength of granite decreases with increasing temperature from 25℃ to 600℃, and the temperature threshold, at which it decreases greatly, is advanced to 200℃ after cooling with water. After 500℃, the tensile strength is more sensitive to water cooling. ②When the load reaches the peak value, the cumulative ringing count of acoustic emission suddenly increases, and the fracture zone forms in the rock sample. Under the influence of water cooling, the ringing count peak value and energy peak value of the rock sample decrease, which indirectly reflects that the internal cracks of the rock are more developed, and both of their decrease range is larger at 200~300℃. The granite is more sensitive to heat treatment at 300℃ and after 500℃. ③With the increase in temperature, the fracture surface of granite changes from flat to rough and tortuous, from brittle to ductile; Cooling in water promotes rock fracture and advances the temperature range from brittleness to ductility. The research results provide a theoretical reference for the stability evaluation of high-temperature rocks in geothermal exploitation.
- high temperature granite /
- cooling mehtod /
- Brazilian split test /
- acoustic emission /
- thermal damage

HTML全文

图 1 试验设备及流程示意图

Figure 1. Test equipment and process diagram

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图 2 高温花岗岩冷却后抗拉强度与温度的关系

Figure 2. Relationship between temperature and tensile strength of high temperature granite after cooling

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图 3 400℃花岗岩冷却后拉应力和累计振铃计数与位移的关系

Figure 3. Relationship between tensile stress, cumulative ringing count and displacement of 400℃ granite after cooling

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图 4 声发射振铃计数峰值随温度的变化

Figure 4. Changes in peak value of ring count with temperature

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图 5 振铃计数峰值降幅及能量峰值降幅随温度的变化

Figure 5. Changes in peak drop of ringing count and peak drop of energy with temperature

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图 6 声发射能量峰值随温度的变化

Figure 6. Changes in peak energy with temperature

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图 7 高温花岗岩冷却后巴西劈裂破坏图

Figure 7. Brazilian splitting failure diagram of high temperature granite after cooling

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表 1 处理后花岗岩巴西劈裂试验结果

Table 1. Brazilian splitting test results of granite after treatment

温度/℃	抗拉强度平均值/MPa
温度/℃	自然冷却	遇水冷却
25	6.14	6.16
200	6.08	5.89
300	5.89	5.15
400	4.85	4.19
500	4.02	3.08
600	1.86	1.10

下载: 导出CSV

表 2 花岗岩劈裂线粗糙度系数JRC

Table 2. Fracture line roughness coefficient JRC of granite

温度/℃	自然冷却			遇水冷却
温度/℃	L/mm	H/mm	JRC	L/mm	H/mm	JRC
25	11.72	0.92	3.911	11.42	0.90	3.917
200	13.19	1.08	4.081	10.72	0.88	4.114
300	21.66	1.92	4.432	15.68	1.55	5.054
400	17.23	1.77	5.274	10.66	1.14	5.539
500	13.40	1.58	6.177	11.19	1.34	6.284
600	12.07	1.49	6.501	16.46	2.06	6.547

下载: 导出CSV

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