不同温度循环冷却作用后花岗岩巴西劈裂特征及其物理力学特性演化规律研究

doi:10.13722/j.cnki.jrme.2020.0247

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摘要干热岩地热开发中，井筒钻进及热储层的热交换都涉及高温岩体受不同程度的冷热循环，导致井筒破裂失稳或热储层破裂程度增加，为了揭示其机制，采用岩石力学试验机并结合声发射监测系统，研究不同温度循环作用后花岗岩的纵波波速及巴西劈裂破坏过程。结果表明：(1) 随着温度循环次数的不断增加，2种冷却作用下花岗岩所对应的抗拉强度均逐渐降低，遇水冷却循环作用后花岗岩的抗拉强度要低于自然冷却状态下花岗岩的抗拉强度，且花岗岩在高温高循环次数下的劣化程度较为明显，当温度大于500 ℃时，花岗岩试样的表观颜色逐渐变为土黄色，试样逐渐由脆性向延性转化。(2) 根据温度可以将花岗岩的破坏特征分为3个阶段，在低温阶段(100 ℃～200 ℃)，试样均沿着巴西圆盘中心线发生破裂；中温阶段(300 ℃～400 ℃)，试样沿着与直径呈一定角度破裂；高温阶段(500 ℃～700 ℃)，试样破裂模式复杂，较为破碎。(3) 低温阶段时的花岗岩随温度循环的变化其纵波波速、强度特征以及变形均变化较小；当试样处于中、高温度阶段时，随循环次数的增加其强度、波速等各项参数衰减幅度逐渐增大。研究结果可为地热开发中井筒破坏失稳及热储层岩体的破裂模式提供理论参考。

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	李春
	胡耀青
	张纯旺
	赵中瑞
	靳佩桦
	胡跃飞
	赵国凯

关键词 ：岩石力学, 巴西劈裂, 高温花岗岩, 抗拉强度, 循环冷却, 破坏模式

Abstract：In the geothermal development of hot dry rocks，both the wellbore drilling and the heat exchange of the heat reservoir involve high-temperature rock mass subjected to different degrees of cooling and heating cycles，resulting in the failure of the wellbore or the increase of the degree of heat reservoir fracture. In order to reveal its mechanism，a rock mechanics tester and an acoustic emission monitoring system were used to study the longitudinal wave velocity of granite and the process of Brazilian split failure after different temperature cycles. The results show that. with increasing the number of cycles，the corresponding tensile strength under water cooling and natural cooling decreases gradually，and that the tensile strength of granite under water cooling is lower than that under natural cooling and the degradation degree of granite is obvious under high temperature and high cycle times. When the temperature is higher than 500 ℃，the apparent of granite samples gradually turns to earthy yellow，and the stress-time curve under cyclic cooling shows a gradual failure trend. At the same time，the samples gradually change from brittleness to ductility. The fracture of granite occurs along the central line of Brazilian disc in the low temperature stage(100 ℃–200 ℃) and at a certain angle with the disc diameter in the middle temperature stage(300 ℃–400 ℃). In the high temperature stage(500 ℃–700 ℃)，the fracture of granite presents complex and broken. It is also indicated that，in the low temperature stage，the influence of temperature cycles on the longitudinal wave velocity，intensity characteristics and deformation of granite is relatively small，while that，in the middle and high temperature stages，the attenuation amplitudes of the strength，wave velocity and other parameters of granite increase with increasing the number of cycles. The research results can provide a theoretical reference for evaluating wellbore failure and fracture patterns of thermal reservoir rock mass in geothermal development.

Key words： rock mechanics Brazilian splitting high temperature granite tensile strength circular cooling destruction mode

引用本文:

李春，胡耀青，张纯旺，赵中瑞，靳佩桦，胡跃飞，赵国凯. 不同温度循环冷却作用后花岗岩巴西劈裂特征及其物理力学特性演化规律研究[J]. 岩石力学与工程学报, 2020, 39(9): 1797-1807.
LI Chun，HU Yaoqing，ZHANG Chunwang，ZHAO Zhongrui，JIN Peihua，HU Yuefei，ZHAO Guokai. Brazilian split characteristics and mechanical property evolution of granite after cyclic cooling at different temperatures#br#. , 2020, 39(9): 1797-1807.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0247 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I9/1797

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