基于声发射多参量分析的岩桥裂纹扩展研究

doi:10.13722/j.cnki.jrme.2017.0762

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摘要为研究开放性岩桥裂纹扩展特征及破裂机制，通过对花岗岩岩桥试样进行单轴压缩试验和声发射监测，基于应力–应变曲线、声发射参数和频谱特征分析其裂纹扩展过程。研究结果表明：裂纹由倾斜预制裂纹尖端起裂，扩展方向受应力方向控制；应力–应变曲线出现“峰前波动上升”和“峰后阶梯式下降”特征；声发射振铃计数率和能率“突增点”与“相对平静期”间隔出现，累计计数和累计能量曲线“台阶式上升”，“突增点”对应宏观裂纹的形成，而“相对平静期”则是为宏观裂纹增长积蓄能量；声发射频谱对裂纹扩展更灵敏，高频低幅值和低频低幅值信号对应沿晶或穿晶微裂纹，高频高幅值信号对应中尺度或穿晶小尺度裂纹，低频高幅值信号对应宏观大尺度裂纹，中频低幅值信号与已有断面的摩擦有关。本文研究获得的裂纹扩展的声发射特征为岩桥破坏机制和监测提供了依据。

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	朱振飞1
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关键词 ：岩石力学, 岩桥, 单轴加载, 声发射, 频谱分析, 裂纹扩展

Abstract：In order to study the characteristics and failure mechanism of crack propagation in open rock bridge， the uniaxial compression tests with AE monitoring system were conducted on specimens with granite bridge. The crack propagation process was analyzed according to the stress-strain curve and the parameters and spectrum characteristics of AE results. The results showed that the crack was initiated from the tip of the prefabricated crack and its direction was controlled by the stress direction. The phenomena of pre-peak fluctuation rise and post-peak ladder descent occurred in the stress-strain curves. The sudden increase point and relatively calm period of AE count rate and energy rate appeared intermittently and the cumulative count rate and cumulative energy curves rose in steps. Each point of sudden increase corresponds to the formation of a macro-crack，and the energy for the propagation of macro-cracks was accumulated in the relatively calm period. The AE spectrum was more sensitive to the crack propagation. The high frequency and low amplitude and the low frequency and low amplitude signals corresponds to the inter-granular cracks or trans-crystalline micro-cracks. The high frequency and high amplitude signals corresponds to the mesoscale cracks or small scale trans-crystalline cracks. The low frequency and high amplitude signals corresponds to the macro-cracks. The middle frequency and low-amplitude signals are related to the friction of existing section.

Key words： rock mechanics rock bridge uniaxial compression acoustic emission spectrum analysis crack propagation

引用本文:

朱振飞1，2，陈国庆1，肖宏跃2，刘辉1，赵聪1. 基于声发射多参量分析的岩桥裂纹扩展研究[J]. 岩石力学与工程学报, 2018, 37(4): 909-918.
ZHU Zhenfei1，2，CHEN Guoqing1，XIAO Hongyue2，LIU Hui1，ZHAO Cong1. Study on crack propagation of rock bridge based on multi parameters analysis of acoustic emission. , 2018, 37(4): 909-918.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.0762 或 http://www.rockmech.org/CN/Y2018/V37/I4/909

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