摘要
为研究软岩声发射序列的分形特征,在MTS815程控伺服刚性试验机上,对膏质泥岩、粉砂岩、页岩进行单轴压缩下的声发射试验。结果表明：声发射序列分形是有限度的,超过一定限度不再分形;随相空间维数m的增加,双对数图整体下移且无标度区变窄,同时关联维数D呈现出增加-稳定-发散的发展过程;3类岩石均在应力水平40%~50%时,关联维数D值最大,随后声发射活动在主破裂附近产生丛集现象,关联维数降低至较低水平;声发射分形维数的演化表现为＂波动-上升-有起伏的整体下降＂链式模式,同时得出损伤破裂的分形识别模式为＂峰值-第2波峰＂模式或称＂反对号（■）＂模式。据此为岩体稳定性监测提供一种新的识别方法。
In order to study on the fractal characteristics of acoustic emission（AE） sequence of soft rock, AE test of the gypsum mudstone, fine sandstone and shale was carried out in the MTS815 programmable servo rigidity testing machine under uniaxial compression. The results show that the fractal of AE sequence is limited, and exceeding a certain limit is no longer a fractal;with the increase of phase space dimension（m）,double logarithmic diagram move down,scale-free zone is narrowed and the correlation dimension（D） shows the development process of increasestabilization-dispersion at the meantime; when three types of rocks are in the stress level of 40%-50%, the correlation dimension（D） is the biggest, and then the AE produce has the cluster phenomenon near the main rupture and the correlation dimension reduces to a low level; the evolution of AE fractal dimension is volatility-rose-decline with fluctuations and fractal recognition pattern of damage and destruction is＂peak to the second peak＂mode or called＂against ture（■）＂mode. This provides a new recognition method for monitoring the stability of rock mass.
出处
《中国测试》
CAS
北大核心
2016年第6期9-13,共5页
China Measurement & Test
基金
国家自然科学基金项目(41272321)
关键词
声发射
振铃计数率
分形
相空间维数
关联维数
acoustic emission
ringing counts rate
fractal
phase space dimension
correlation dimension
