花岗岩及细粒花岗岩声发射时频域特征分析  

Analysis of AE Time-Frequency Characteristics of Granite and Fine-Grained Granite

作　　者：王创业 隋青瑞 游茹 韩天宇 刘城成 Wang Chuangye;Sui Qingrui;You Ru;Han Tianyu;Liu Chengcheng(School of Mining and Coal,Inner Mongolia University of Science and Technology,Baotou,Inner Mongolia 014010,P.R.China;Inner Mongolia Key Laboratory of Mining Engineering,Baotou,Inner Mongolia 014010,P.R.China;Inner Mongolia Research Center for Coal Safety Mining and Utilization Engineering and Technology,Baotou,Inner Mongolia 014010,P.R.China;Inner Mongolia Cooperative Innovation Center for Coal Green Mining and Green Utilization,Baotou,Inner Mongolia 014010,P.R.China)

机构地区：[1]内蒙古科技大学矿业与煤炭学院,内蒙古包头014010 [2]内蒙古自治区矿业工程重点实验室,内蒙古包头014010 [3]内蒙古自治区煤炭安全开采与利用工程技术研究中心,内蒙古包头014010 [4]内蒙古煤炭绿色开采与绿色利用协同创新中心,内蒙古包头014010

出　　处：《地下空间与工程学报》2025年第1期100-108,共9页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(52464014);中央引导地方科技发展计划项目(2024ZY0068);内蒙古自治区研究生科研创新项目(KC2024057S);内蒙古自治区直属高校基本科研业务费(2024RCTDO15);内蒙古自治区高等学校青年科技英才支持计划项目(NJYT22073)。

摘　　要：为进一步研究不同粒度花岗岩内部裂纹演化特征,对花岗岩及细粒花岗岩进行单轴压缩声发射试验。结果表明:对比事件率、累积事件数、能率、累积能量可知细粒花岗岩在裂纹不稳定扩展阶段裂纹萌生能力弱于花岗岩,在峰后破坏阶段表现出较强的脆性特征;花岗岩高幅值声发射(AE)信号占比约为细粒花岗岩的2倍,花岗岩高幅值声发射信号占比更多,破坏更剧烈;主破裂发生之前细粒花岗岩的平均频率(AF)值高于花岗岩,细粒花岗岩在主破裂发生之前孕育更高占比的张拉裂纹;对试样求取主频熵值,发现主频熵值的“波动升高 波动降低”的拐点可作为试样的临界破坏前兆点;试样内部各阶段不同类型AE信号演化规律进行分析,发现在裂纹稳定扩展阶段中花岗岩出现大量低幅值中主频的声发射信号,说明花岗岩在此阶段会积累更多的损伤。In order to further study the characteristics of crack evolution in different granites,uniaxial compression acoustic emission experiments were carried out on granites and fine-grained granites.It is found that by comparing the event rate,cumulative event number,energy rate and cumulative energy,the crack initiation ability of fine-grained granite is weaker than that of granite in the unstable crack growth stage,and the brittle character is stronger in the post-peak failure stage.The proportion of high-amplitude AE signals in granite is about twice that of fine-grained granite,and the proportion of high-amplitude AE signals in granite is more,and the damage is more intense.The AF value of fine-grained granite is higher than that of granite before the main fracture occurs,and the fine-grained granite has a higher proportion of tension cracks before the main fracture occurs.It is found that the inflection point of"fluctuation increasing-fluctuation decreasing"can be used as the critical failure precursor point of the sample.The evolution law of different types of AE signals in each stage of the sample is analyzed,and it is found that a large number of low amplitude and medium frequency AE signals appear in the granite in the stable crack expansion stage,indicating that more damage will be accumulated in the granite at this stage.

关 键 词：RA-AF值 主频熵值 时频域 归一化频谱图 

分 类 号：TU45[建筑科学—岩土工程]