基于灰色关联度的砂岩加载过程中AIRT演化特征研究

AIRT evolution features in the process of sandstone loading based on gray correlation

在受力岩石的红外辐射效应研究中,AIRT时序曲线应用广泛,但试件岩石成分、损伤分布不均又各向异性,导致AIRT时序曲线形式多样,共性特征隐蔽,难以明确分类.文中以单轴压缩下粉砂岩红外观测试验为依托,对原AIRT时间序列,先进行重采样和归一化处理,再进行灰色关联聚类分析,以序列间发展趋势的相似程度为定量指标,进行分类.结果表明:此次试验,临界值取0.7,可将AIRT时序曲线分成2类,其中,第Ⅰ类曲线占60%,具明显的红外异常前兆,此种数据处理方法 ,对AIRT演化特征及灾变前兆定量研究具有一定的参考意义.

In the study of the effect of stress rock infrared radiation, although AIRT temporal curve is used widely, due to uneven distribution and anisotropy of rock specimen composition and damage, the AIRT tempo-ral curve is always in a variety of forms with common features hidden and difficulty to be classified clearly.The paper, based on infrared observation experiment of siltstone under uniaxial compression, resamples and normalizes the original AIRT time series, then carries out grey correlation clustering analysis and classifies them with development trend of similar degree between sequences as quantitative indicators. Results show that for the test, when the critical value is 0.7, the AIRT temporal curve can be divided into two categories, the first class curve of which accounts for 60 % of all, with obvious infrared abnormal precursors, and the data pro-cessing method has very important reference significance for the AIRT evolution characteristics and catastro-phe precursor quantitative research.