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工程科学与技术:2018,50(5):12-17
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大理岩破坏的声发射双主频特征及其机制初探
(1.四川大学 水力学与山区河流开发保护国家重点实验室, 四川 成都 610065;2.四川大学 水利水电学院, 四川 成都 610065;3.成都大学 建筑与土木工程学院, 四川 成都 610106)
Twin-peak Frequencies of Acoustic Emission Due to the Fracture of Marble and Their Possible Mechanism
(1.State Key Lab. of Hydraulics and Mountain River Eng., Sichuan Univ., Chengdu 610065, China;2.College of Water Resource & Hydropower, Sichuan Univ., Chengdu 610065, China;3.School of Architecture and Civil Eng., Chengdu Univ., Chengdu 610106, China)
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投稿时间:2018-01-31    修订日期:2018-05-29
中文摘要: 声发射是加载过程中岩石微破裂产生的瞬态弹性能释放现象,在岩石力学测试中得到广泛应用。目前,声发射主要通过参数分析和定位分析描述加载过程中岩石的微破裂演变特征。然而,岩石的微破裂包括张破裂和剪破裂两类,声发射信号能否反映岩石的微破裂形式显然是一个值得探究的课题。选取四川宝兴县大理岩,分别进行直接拉伸试验、巴西圆盘劈裂试验和单轴压缩试验,采集了不同试验方法所有试件的声发射波形信号,采用快速傅里叶变换方法编程实现了声发射波形信号的频谱分析,批量获取了声发射波形信号的主频值。统计分析表明:大理岩破坏的声发射信号均存在明显的、与试验方法无关的双主频特征,反映了大理岩破裂的固有特性;初步力学机制分析表明,双主频可能反映了岩石的两种不同微破裂形式,其中低主频带对应微观拉破裂,高主频带对应微观剪破裂。
Abstract:Acoustic emission (AE) is a transient emission of elastic energy due to the micro cracking of rock under loading and is widely used in the various tests of rock mechanics. By now, both parametric analysis and positioning analysis are the most frequently applied techniques in AE to describe the evolution of micro cracking in rock specimen under loading. However, micro cracking can be divided into two types, i.e. shear cracking and tension cracking. It is still an unexplored problem that whether AE signal can reveal the two cracking types. In order to solve this problem, direct tensile test, Brazilian split test and uniaxial compression test were carried out for the Baoxing marble, Sichuan province, China and all the AE waveform signals are recorded for the tests. The waveforms were further analyzed by Fast Fourier Transformation (FFT) to acquire their peak frequencies. Statistics showed that there exist predominant twin-peak frequencies for all the AE waveforms, which are independent of the testing methods and should reflect the inherent cracking property of the marble. Preliminary mechanical analysis indicated that the twin-peak frequencies are most likely the result of the two cracking types, the lower peak frequency is corresponding to the micro tension cracking, while the higher peak frequency to the micro shear cracking.
文章编号:201800112     中图分类号:TU45    文献标志码:
基金项目:国家重点研发计划资助项目(2016YFC0600702)
作者简介:邓建辉(1965-),男,教授,博士.研究方向:地质灾害、高地应力条件下的岩石力学问题.E-mail:jhdeng@scu.edu.cn
引用文本:
邓建辉,李林芮,陈菲,刘建锋,余建.大理岩破坏的声发射双主频特征及其机制初探[J].工程科学与技术,2018,50(5):12-17.
DENG Jianhui,LI Linrui,CHEN Fei,LIU Jianfeng,YU Jian.Twin-peak Frequencies of Acoustic Emission Due to the Fracture of Marble and Their Possible Mechanism[J].Advanced Engineering Sciences,2018,50(5):12-17.