矿业科学学报2025，Vol.10Issue(2)：184-193,10.DOI:10.19606/j.cnki.jmst.2024906
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
摘要
Abstract
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 me-chanical 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 longi-tudinal wave velocity and indirect tensile strength of the rock,both of which gradually decrease with in-creasing temperature.Within the range of 450～600℃,there is a temperature threshold at which the decrease in the longitudinal wave velocity and indirect tensile strength of the rock is most significant,and a linear relationship is observed.关键词
干热岩/热冲击/DIC/起裂模式/巴西劈裂Key words
hot dry rock/thermal shock/DIC/crack initiation mode/Brazilian splitting分类
矿山工程引用本文复制引用
吴星辉,张淑坤,钟辉,朱雨,顾树熙..热损伤花岗岩巴西劈裂行为及损伤机理研究[J].矿业科学学报,2025,10(2):184-193,10.基金项目
国家自然科学基金(52274072,52074020) （52274072,52074020）
山东省自然科学基金(ZR2024ME257) （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) （SKLCRSM22KF014）
