闪长岩破裂的声发射前兆现象及其裂纹路径演化规律
Precursory phenomena of acoustic emission and evolutionary laws of crack propagation path in diorite fracturing
温骁东 1马庆山 2李进鹏 1张子程 1钟健 2张鹏海2
作者信息
- 1. 招金矿业股份有限公司
- 2. 东北大学资源与土木工程学院
- 折叠
摘要
为了研究岩石破裂过程中裂纹扩展路径演化规律,基于声发射监测数据,结合矩张量反演、裂纹尺度量化及裂纹拓扑关系量化建立了裂纹扩展路径分析方法,并基于室内声发射试验分析了闪长岩单轴压缩破坏过程.研究结果表明:闪长岩在受载过程中产生微裂纹的特征尺度为1.06 mm,明显高于矿物颗粒的平均尺度;随着应力的增加,闪长岩试件内部的微裂纹由离散状态逐渐过渡为相互贯通状态,微裂纹相对集中区域更容易演化为宏观裂纹.
Abstract
In order to study the evolutionary laws of crack propagation paths during rock fracturing,a crack propa-gation path analysis method was established based on acoustic emission monitoring data,combined with moment tensor inversion,crack scale quantification,and crack topological relationship quantification.Through indoor acoustic emission tests,the process of diorite uniaxial compression failure was analyzed.The research results show that the characteristic scale of microcracks generated in diorite during the loading process is 1.06 mm,significantly higher than the average scale of mineral grains.With the increase of stress,the microcracks inside the diorite specimen gradually transition from a discrete state to a coalesced state,and microcrack concentration zones are more prone to evolve into macroscopic cracks.
关键词
闪长岩/声发射/裂纹演化/岩石破裂/前兆规律Key words
diorite/acoustic emission/crack evolution/rock fracturing/precursory patterns引用本文复制引用
基金项目
中央高校基本科研业务专项资金项目(N2201015)
出版年
2024
NETL
NSTL
维普
万方数据