热损伤花岗岩巴西劈裂行为及损伤机理研究  

Experimental study on Brazilian splitting characteristics of heat damaged hot dry granite

作　　者：吴星辉 张淑坤 钟辉 朱雨 顾树煕 WU Xinghui;ZHANG Shukun;ZHONG Hui;ZHU Yu;GU Shuxi(School of City and Architecture Engineering,Zaozhuang University,Zaozhuang Shandong 277160,China;Shandong Xinkuang Zhaoguan Energy Co.,Ltd.,Qihe Shandong 251113,China)

机构地区：[1]枣庄学院城市与建筑工程学院,山东枣庄277160 [2]山东新矿赵官能源有限责任公司,山东齐河251113

出　　处：《矿业科学学报》2025年第2期184-193,共10页Journal of Mining Science and Technology

基　　金：国家自然科学基金(52274072,52074020);山东省自然科学基金(ZR2024ME257);中国矿业大学煤炭精细勘探与智能开发全国重点实验室基金(SKLCRSM22KF014)。

摘　　要：在干热花岗岩地热开采过程中,储层换热冷却会对高温岩石造成热损伤,直接影响储层岩石的力学性质。为实现深部地热资源与矿产共采,探索了热损伤干热花岗岩的劈裂特性演化规律。以山东烟台深部花岗岩为研究对象,进行热冲击处理,结合巴西劈裂试验和数字图像处理技术,监测岩石表面裂隙的起裂、扩展和贯穿过程。实验结果表明,热损伤过程会改变岩石微观结构,导致岩石出现2种起裂模式;温度对岩石纵波波速和间接拉伸强度具有显著影响,二者随温度的升高逐渐降低,且在450~600℃范围内降幅最为显著,并呈现线性关系。In the process of geothermal exploitation in dry-hot granite reservoirs,the heat exchange and cooling of the reservoir can cause thermal damage to high-temperature rocks,directly affecting the mechanical properties of the reservoir rocks.To achieve the co-extraction of deep geothermal resources and minerals,the evolution law of the splitting characteristics of thermally damaged dry-hot granite has been explored.Taking the deep granite in Yantai,Shandong as the research object,thermal shock treatment was conducted,combined with the Brazilian splitting test and digital image processing technology to monitor the initiation,propagation,and penetration of rock surface fractures.The experimental results show that the thermal damage process changes the microstructure of the rock,leading to two types of crack initiation patterns during the splitting process.Temperature has a significant impact on the longitudinal wave velocity and indirect tensile strength of the rock,both of which gradually decrease with increasing temperature.Within the range of 450~600°C,there is a temperature threshold at which the decrease in the longitudinal wave velocity and indirect tensile strength of the rock is most significant,

关 键 词：干热岩 热冲击 DIC 起裂模式 巴西劈裂 

分 类 号：TD315[矿业工程—矿井建设]