中间主应力对花岗岩双轴压缩破坏过程的声发射演化特征影响  被引量:1

Influence of Intermediate Principal Stress on Acoustic Emission Evolutionary Characteristics of Granite Biaxial Compression Failure Process

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作  者:刘鑫锦 苏国韶[3] 李小玉 张康 冯木生 LIU Xinjin;SU Guoshao;LI Xiaoyu;ZHANG Kang;FENG Musheng(Shandong Rail Transit Intelligent Construction and Operation and Maintenance Technology Engineering Research Center,Jinan 250001,China;Shandong Rail Transit Survey and Design Institute Co.,Ltd.,Jinan 250001,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Guangxi Changzhou Hydro Power Development Co.,Ltd.,Wuzhou 543002,China)

机构地区:[1]山东省轨道交通智慧建造与运维技术工程研究中心,山东济南250001 [2]山东轨道交通勘察设计院有限公司,山东济南250001 [3]广西大学土木建筑工程学院,广西南宁530004 [4]国家电投集团广西长洲水电开发有限公司,广西梧州543002

出  处:《河南科技大学学报(自然科学版)》2024年第1期79-87,97,M0007,M0008,共12页Journal of Henan University of Science And Technology:Natural Science

基  金:国家自然科学基金项目(52169021);山东省博士后创新项目(202103033)。

摘  要:为了探究中间主应力对花岗岩双轴压缩破坏过程的声发射演化特征影响,对花岗岩于不同中间主应力下双轴压缩破坏过程的声发射信号开展了时域及频域多角度综合分析。试验结果表明:中间主应力对花岗岩双轴压缩破坏的声发射前兆有显著影响,即随着中间主应力增大,声发射累计振铃计数达到连续性急剧突变增长阶段的应力水平减小,b值的连续下降速率减小,优势频段(125~250 kHz)占比发生明显转变时的应力水平降低,但低频高幅值信号所占比例增加。得到了花岗岩双轴压缩破坏的多种声发射前兆特征,即在岩石失稳破坏前夕,声发射累计振铃计数呈现连续性急剧突变增长以及b值持续性显著下降,低频高幅值信号出现,优势频段(125~250 kHz)占比展现增加趋势。In order to investigate the influence of intermediate principal stress on the acoustic emission evolution ary characteristics of granite biaxial compression failure process,a comprehensive analysis of the acoustic emission signals of granite biaxial compression failure process under different intermediate principal stresses was conducted from multiple perspectives in time and frequency domains.The test results show that the intermediate principal stress has a significant effect on the acoustic emission precursors of granite biaxial compression failure.With the increase of the intermediate principal stress,the stress level decreases when the cumulative acoustic emission ringing count reaches the continuous rapid growth stage,the continuous decline rate of the B-value decreases,and the stress level decreases when the proportion of the dominant frequency band(125~250 kHz)changes significantly.However,the proportion of low-frequency and high-amplitude signals increases.A variety of acoustic emission precursory characteristics of biaxial compression failure of granite were obtained.On the eve of rock instability and failure,the cumulative acoustic emission ringing count presents a continuous and sudden increase and a significant continuous decline in B-value,low-frequency and high-amplitude signals appear,and the proportion of dominant frequency band(125~250 kHz)shows an increasing trend.

关 键 词:岩石 双轴压缩 中间主应力 声发射 演化特征 

分 类 号:TP273[自动化与计算机技术—检测技术与自动化装置]

 

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