Acoustic emission characteristics of different brittle rocks and its application in brittleness evaluation
Acoustic emission characteristics of different brittle rocks and its application in brittleness evaluation
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不同脆性岩石的声发射特性及其在脆性评价中的应用
DOI：
10.1007/s40948-021-00246-5
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发表时间：
2021-05
影响因子：
5
通讯作者：
Zhao Wanchun
中科院分区：
文献类型：
--
作者：
Zhang Hui;Wang Zhizhang;Song Zhenlong;Zhang Yuzhu;Wang Tingting;Zhao Wanchun
岩石脆性是影响地下工程灾害和能源开采的重要因素。岩石在破坏过程中会产生大量的裂纹，伴随着大量的声发射信号。不同脆性岩石在破坏过程中裂纹的扩展速度和模式不同，其声发射信号也表现出不同的特征。本研究对不同脆性的类岩材料进行了单轴压缩实验并配合声发射监测。结果表明，随着岩石脆性的增加，加载过程中声发射能量急剧增加。岩石破坏过程中，随着岩石脆性的增加，RA（上升时间/振幅）越低、AF（平均频率）越高的声发射信号所占比例越高。基于实验结果，提出了用声发射参数值来评价岩石裂纹扩展状态的方法。该值也是决定裂纹起裂点和残余应力点的参数。基于岩石破坏过程中ibe值的变化特征和岩石峰值后的第一次压降，提出了两种岩石脆性评价标准。与其他脆性评价标准相比，这两个评价标准对不同脆性岩石具有更好的区分能力，可指导人类地下资源开采和工程防灾。在岩石破坏时刻，随着岩石脆性的增加，低RA和高AF的声发射比例逐渐增加。基于Gutenberg和Richter，提出了反映岩石裂纹扩展状态的声发射指标值。基于onibe值，提出了一种灵敏度和可靠性都高于其他脆性指标的脆性指标。
Rock brittleness is an essential factor affecting underground engineering disasters and energy extraction. A large number of cracks are generated during rock destruction, and many acoustic emission (AE) signals are accompanied. The propagation speed and modes of cracks in different brittle rocks differ during failure, and their AE signals also show differing characteristics. In this study, uniaxial compression experiments cooperating with AE monitoring on rock-like materials with different brittleness were conducted. We found that as the rock brittleness increased, the AE energy increased sharply during loading. During rock failure, the proportion of AE signals with lower RA (rise time/amplitude) and higher AF (average frequency) increased as rock brittleness increased. Based on the experimental results, the AE parameteribE-value was proposed to evaluate the crack propagation state of the rocks. ThisibE-value is also a parameter that determines the crack initiation point and residual stress point. Based on the variation characteristic of theibE-value during the rock failure process and the first pressure drop after the peak of the rock, two evaluation criteria for rock brittleness were proposed. Compared with other brittleness evaluation criteria, these two evaluation criteria have better discrimination for different brittleness rocks, guiding human underground resource extraction and engineering disaster prevention.Article highlightsAt the moment of rock failure, the proportion of AE with lower RA and higher AF increases gradually with the increase of rock brittleness.Based on the Gutenberg and Richter, we propose an AE indexibE-value, which can reflect the rock’s crack propagation state.Based onibE-value, we propose a brittleness index, which has higher sensitivity and reliability than other brittleness indexes.
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影响因子：
6.2
作者：
V. Mansurov
通讯作者：
V. Mansurov
DOI：
10.1007/s40948-021-00219-8
发表时间：
2021-01
影响因子：
5
作者：
Jing Yang;Sheng-qi Yang;Guangli Liu;W. Tian;Ye Li
通讯作者：
Jing Yang;Sheng-qi Yang;Guangli Liu;W. Tian;Ye Li
影响因子：
--
作者：
Haoran Li;Zhikai Dong;Zuolin Ouyang;Liu Bo;W. Yuan;Hongwu Yin
通讯作者：
Haoran Li;Zhikai Dong;Zuolin Ouyang;Liu Bo;W. Yuan;Hongwu Yin
影响因子：
6.2
作者：
Jun Zhang;Chi Ai;Yuwei Li;Ming-guang Che;Rui Gao;Jia Zeng
通讯作者：
Jun Zhang;Chi Ai;Yuwei Li;Ming-guang Che;Rui Gao;Jia Zeng
影响因子：
2.1
作者：
A. Schiavi;G. Niccolini;P. Tarizzo;A. Carpinteri;G. Lacidogna;A. Manuello
通讯作者：
A. Schiavi;G. Niccolini;P. Tarizzo;A. Carpinteri;G. Lacidogna;A. Manuello