不同应力状态下岩石声发射波形分形研究  

Fractal Study on Acoustic Emission Waveform of Rock Under Different Stress States

作　　者：何正刚 

机构地区：[1]北京天地玛珂电液控制系统有限公司,北京100013

出　　处：《煤矿安全》2017年第11期57-60,共4页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51304117;51404140;51574150);中煤科工集团科技创新基金重点资助项目(2014ZD008)

摘　　要：利用TAW-2000型岩石三轴伺服试验机分别对泥岩、细砂岩和粗砂岩3种不同岩性岩石进行单轴压缩试验和剪切试验,并用德国Vallen AMSY-6声发射信号采集系统对加载过程中产生的声发射信号进行采集。采用分形方法分析了2种加载方式以及加载过程中不同阶段的声发射波形差异性和演化规律。研究结果显示:单轴压缩试验过程中产生的声发射信号其分形盒维数普遍大于剪切试验,波形复杂程度更高;随着应力的逐渐增加,单轴压缩试验过程中产生声发射信号的分形盒维数有逐渐上升的趋势,而剪切试验信号的分形特性无此规律。Using TAW-2000 servo testing machine, the uniaxial compression and shearing experiments were tested for mudstone,fine sandstone and gritstone, and at the same time, the Germany Vallen AMSY-6 acoustic emission signal acquisition system was used for collecting the acoustic emission signals. The difference and evolution laws of acoustic emission waveform under two loading modes and at different stages of loading were analyzed by adopting fractal methods. And the results show that the fractal box dimension of acoustic emission during the process of uniaxial compression test is generally greater than that during the process of shear test, and in addition, waveform of uniaxial compression test is more complex than that of shear test. Besides, with the increasing of stress, the fractal box dimensions of acoustic emission signals of uniaxial compression test gradually arise, however, the fractal characteristics of shear test do not have similar law.

关 键 词：声发射 波形分析 分形盒维数 剪切试验 应力状态 岩石破坏 

分 类 号：TD315[矿业工程—矿井建设]