分级循环加载下缺陷砂岩裂纹扩展及声发射频谱特征分析  

Characterization Analysis of Crack Propagation and Acoustic Emission Spectrum of Defective Sandstone under Graded Cyclic Loading

作　　者：张五洲[1,2] 鲁鲲鹏 张合星[1] 熊赟 ZHANG Wuzhou;LU Kunpeng;ZHANG Hexing;XIONG Yun(College of Resources and Environmental Engineering,Guizhou University,Guiyang,Guizhou 550025,China;Guizhou Zhiheng Engineering Survey and Design Consulting Co.Ltd.,Guiyang,Guizhou 550004,China;Key Laboratory of Karst Geological Resources and Environment Ministry of Education,Guiyang,Guizhou 550025,China)

机构地区：[1]贵州大学资源与环境工程学院,贵州贵阳550025 [2]贵州省智恒交通设计院有限公司,贵州贵阳550004 [3]贵州大学喀斯特地质资源与环境教育部重点实验室,贵州贵阳550025

出　　处：《河北工程大学学报（自然科学版）》2023年第3期56-63,76,共9页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：贵州省科技厅项目(黔科合支撑[2021]一般512);贵州省交通厅科技项目(2020-123-003)。

摘　　要：针对因岩石力学性能劣化而诱发的工程灾害,以砂岩为研究对象,开展不同裂纹倾角下分级循环加载试验,分析了裂纹倾角对砂岩力学特性和裂纹扩展特征的影响;结合声发射频谱特征对微裂纹的发展情况进行了分析,最后利用关联维数对其变形破坏的有序度进行定量描述。结果表明:随着裂纹倾角的增大,试件的峰值荷载呈逐渐降低的趋势,但是预制裂纹的扩展无明显规律。其中频域信号的出现具有一致性,说明岩石内部微裂纹的萌生、发育、扩展形成大尺度裂纹具有同步性。岩石变形破坏的有序度可用关联维数进行定量描述,表现为关联维数越大,岩石破坏越复杂,其中关联维数变化幅度可以表征岩石内部裂纹的发展剧烈程度。In view of the engineering disasters caused by the deterioration of rock mechanical properties,the sandstone was taken as the research object,and the graded cyclic loading tests were carried out under different crack dip angles.The effects of crack dip angles on the mechanical properties and crack growth characteristics of sandstone were analyzed.The development of microcracks was analyzed based on the characteristics of the acoustic emission spectrum,and finally,the ordered degree of the deformation and failure was quantitatively described using the correlation dimension.The results indicate that as the crack inclination angle increases,the peak load of the specimen gradually decreases,but there is no obvious pattern of pre-crack propagation.The occurrence of frequency domain signals is consistent,indicating that the initiation,development,and propagation of microcracks within rocks are synchronized to form large-scale cracks.The orderliness of rock deformation and failure can be quantitatively described by the correlation dimension,which indicates that the larger the correlation dimension,the more complex the rock failure.The magnitude of the change in the correlation dimension can characterize the severity of the development of internal cracks in the rock.

关 键 词：岩石破坏 多级循环加载 声发射 主频 关联维数 

分 类 号：TU45[建筑科学—岩土工程]