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为研究层理倾角对岩石声发射特征的影响,将取自河北滦县司家营铁矿露天坑的层状黑云变粒岩分别加工成层理倾角为0°,45°,90°的3种试件,并进行单轴压缩条件下的声发射试验。通过对不同层理倾角岩石声发射事件时空分布、盒维数以及能量释放特征的分析发现:层理倾角为0°和90°的岩石均发生劈裂破坏且具有相似的声发射事件时空分布规律;层理倾角为45°的岩石以剪切破坏为主,声发射事件时空分布规律与破裂模式有关;随着层理倾角的增大,临近破坏时盒维数降低现象出现的可能性会降低,并且声发射能量释放方式由匀速释放向阶跃式释放转变。研究成果对于利用声发射手段深入揭示层状岩石破裂机制具有一定的学术价值。
In order to study the influence of bedding inclination on acoustic emission characteristics of rock, stratiform black-bedded grained rock from the open pit of the Sijiaying iron mine in Luan County, Hebei Province was processed into a series of stratified dip angles of 0 °, 45 ° and 90 °, respectively Three specimens were tested and the acoustic emission under uniaxial compression was tested. Based on the analysis of spatiotemporal distribution, box dimension and energy release characteristics of acoustic emission events of rock with different bedding angles, it is found that rocks with bedding inclination of 0 ° and 90 ° both have splitting failure and have similar spatiotemporal distribution of acoustic emission events ; The shear instability of the rocks with a 45 ° bedding angle is mainly shear failure, and the spatiotemporal distribution of acoustic emission events is related to the rupture mode. With the increase of bedding inclination, the probability of decreasing the box dimension near the failure will decrease , And the acoustic emission energy release mode changes from uniform release to step release. The research results have certain academic value for revealing the mechanism of layered rock failure by means of acoustic emission.