高温环境下花岗岩损伤演变及量化研究  

Damage Evolution and Quantification of Granite in a High-Temperature Environment

作　　者：李琴[1] 张峰 翟预立 黄志强[1] 陈科 Li Qin;Zhang Feng;Zhai Yuli;Huang Zhiqiang;Chen Ke(School of Mechanical and Electrical Engineering,Southwest petroleum University,Chengdu 610500,P.R.China)

机构地区：[1]西南石油大学机电工程学院,成都610500

出　　处：《地下空间与工程学报》2024年第2期437-448,459,共13页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51974272);四川省科技创新苗子工程(2022035)。

摘　　要：为揭示高温环境下岩石的损伤演变,将花岗岩加热至600℃、800℃、1 000℃并分析其断口形貌特征,采用数字图像处理技术、损伤力学和“损伤微元”理论,结合各温度下花岗岩细观裂纹特性,建立了岩石损伤评价方法,并开展岩石损伤量化研究。结果表明:花岗岩的断口特征与裂纹的萌生和扩展相关,且裂纹数量、分布密度随温度上升而增加;各温度区间下,花岗岩细观裂纹长度服从对数正态分布,内部损伤表现形式以短裂纹为主,长裂纹为辅;不同温度下花岗岩细观裂纹由单方向延伸发育成多方向贯穿,最高损伤度和温度呈正相关。该研究揭示了高温下花岗岩内部裂纹损伤演化规律,该损伤评价方法对高温地层岩石稳定性评估和地下工程的维护具有重要的参考价值。In order to reveal the damage evolution of rock under high temperature environment,granite was heated to 600℃,800℃,1000℃and its fracture morphology was analyzed.Using digital image processing technology,damage mechanics and"damage micro element"theory,combined with the characteristics of granite micro cracks at various temperatures,a rock damage evaluation method was established and a quantitative study of rock damage was carried out.The results show that:The fracture characteristics of granite are related to the initiation and propagation of cracks,and the number and distribution density of cracks increase with temperature;In each temperature range,the micro crack length of granite obeys logarithmic normal distribution,and the internal damage forms are mainly short cracks,supplemented by long cracks;At different temperatures,the micro cracks of granite developed from unidirectional extension to multi-directional penetration,and the maximum damage degree was positively correlated with temperature.This study reveals the damage evolution law of granite internal cracks,and the damage evaluation method has important reference value for the stability evaluation of high-temperature formation rock and the maintenance of underground engineering.

关 键 词：岩石裂纹 细观形貌 扫描电镜 能谱仪 损伤评价 

分 类 号：TU45[建筑科学—岩土工程]