基于深度聚类−1D−CNN的黄砂岩单轴压缩破坏预警研究

Deep Clustering and 1D−CNN for Early Warning of Uniaxial Compression Failure in Yellow Sandstone

  • 摘要: 声发射(AE)参数变化特征能够揭示岩石破坏的内在规律,因此基于AE特征建立前兆信息识别模型是黄砂岩破坏监测预警的核心。开展关于黄砂岩的单轴压缩声发射特征试验,基于自编码器−K−Means深度聚类算法,对黄砂岩单轴压缩全过程的AE参数片段进行聚类分析。分析结果表明:标签为“2”的参数片段在加载前中期基本无分布,在临近峰值应力前呈现“密集−持续”的分布特征,将标签“2”参数片段的出现作为黄砂岩破坏的前兆特征。基于该前兆特征采用1D−CNN+BiLSTM方法建立黄砂岩单轴破坏的短临预警模型,结果显示:1D−CNN+BiLSTM模型仅在峰值前“15~30 s”内能大量识别出标签为“2”的AE信号片段,与聚类结果的误差在“2~4 s”内。该结果表明1D−CNN+BiLSTM模型能够有效捕捉AE信号片段的变化特征,实现黄砂岩单轴压缩的破坏预警。

     

    Abstract: The variation characteristics of acoustic emission (AE) parameters can reveal the underlying mechanisms of rock failure. Therefore, establishing a precursor identification model based on AE features is central to monitoring and providing early warning for yellow sandstone failure. Uniaxial compression experiments were conducted on yellow sandstone to investigate its AE characteristics. A deep clustering algorithm combining an autoencoder and K−Means was employed to perform cluster analysis on AE parameter segments covering the entire uniaxial compression process. The analytical results indicate that parameter segments labeled “2” were essentially absent during the initial and middle loading stages but exhibited dense − continuous distribution characteristics immediately prior to the peak stress. Therefore, the emergence of label “2” parameter segments can be regarded as a precursor feature for the failure of yellow sandstone. Based on this precursor feature, we developed a short−term warning model for uniaxial failure of yellow sandstone using a hybrid 1D−CNN and BiLSTM method. The results show that the 1D−CNN+BiLSTM model identified a substantial number of Label “2” AE segments, but only in the “15~30” second window preceding peak stress. The timing of these identifications exhibited an error of merely “2~4” seconds compared to the clustering results. This indicates that the 1D−CNN+BiLSTM model can effectively capture the changing features of AE signal segments, enabling effective early warning for the uniaxial compressive failure of yellow sandstone.

     

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