摘要
采矿扰动引起的岩爆等动力灾害严重制约深部矿产资源的开发利用,探索岩石内部裂纹的扩展过程对揭示岩石破坏机制和灾害预警具有重要意义。基于此,对花岗岩在单轴加载作用下的声发射时空响应特征进行了监测。采用单链接聚类(SLC)方法,构造了声发射事件的SLC结构,并通过引入声发射事件的空间相关长度,分析了不同时间尺度下声发射事件之间的空间相关程度。结果表明,声发射事件的三维定位及能量属性可表征花岗岩试样中微裂纹的扩展及损伤演化过程。随着应力的增大,SLC结构中链路长度逐渐减小,裂纹集群内部的相关性增强。空间相关长度经历了“高位波动—平稳波动—突增”的三阶段。在接近花岗岩破裂时,由于应力在试样中的重新分布和传递导致空间相关长度突增,可作为花岗岩失稳预警点。SLC方法为研究岩石裂纹扩展演化过程提供了一种有效方法,可为岩爆等动力灾害预警及防治提供重要的参考。
Dynamic disasters such as rockburst caused by mining disturbance seriously restrict the development and utilization of deep mineral resources.It is of great significance to explore the propagation process of internal cracks in rocks to reveal the rock failure mechanism and disaster warning.Based on this,the spatial-temporal response characteristics of acoustic emission of granite under uniaxial loading were monitored.The single linkage clustering(SLC)method was used to construct the SLC structure of acoustic emission events.By introducing the spatial correlation length of acoustic emission events,the spatial correlation degree between acoustic emission events at different time scales was analyzed.The results show that the threedimensional localization and energy properties of acoustic emission events can characterize the propagation and damage evolution process of microcracks in granite specimens.As the stress increases,the link length in the SLC structure gradually decreases,and the correlation within the crack cluster increases.The spatial correlation length has experienced three stages of high-level fluctuations,stable fluctuations and sudden increase.When it is close to the fracture of granite,the spatial correlation length increases sharply due to the redistribution and transmission of stress in the sample,which can be used as the early warning point of granite instability.The SLC method provides an effective method for studying the evolution process of rock crack propagation,which can provide a reference for the early warning and prevention of dynamic disasters such as rock burst.
作者
王振兴
王洋
樊龙
徐勇勇
张宇
WANG Zhenxing;WANG Yang;FAN Long;XU Yongyong;ZHANG Yu(Shaanxi Shaanmei Caojiatan Mining Co.,Ltd.,Yulin,Shannxi 719000,China)
出处
《矿业研究与开发》
北大核心
2025年第10期144-151,共8页
Mining Research and Development
关键词
花岗岩
岩石破裂
声发射
单链接聚类
空间相关长度
Granite
Rock fracture
Acoustic emission
Single linkage clustering
Spatial correlation length
