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Zhangwei Chen, Zhixiang Liu, Jiangzhan Chen, Xibing Li, and Linqi Huang, Intelligent identification of acoustic emission Kaiser effect points and its application in efficiently acquiring in-situ stress, Int. J. Miner. Metall. Mater., (2025). https://doi.org/10.1007/s12613-024-2977-6
Zhangwei Chen, Zhixiang Liu, Jiangzhan Chen, Xibing Li, and Linqi Huang, Intelligent identification of acoustic emission Kaiser effect points and its application in efficiently acquiring in-situ stress, Int. J. Miner. Metall. Mater., (2025). https://doi.org/10.1007/s12613-024-2977-6
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声发射Kaiser效应点的智能识别及其在高效获取原位应力中的应用

摘要: 大型深部地下工程建设迫切需求准确的原位应力信息,当前声发射(AE)Kaiser效应法因其成本低、操作简便,具有广泛应用前景。在该方法中,Kaiser点的识别准确性和效率尤为关键。为此,本研究将混沌理论与机器学习相结合,提出一种快速、精准识别Kaiser点的智能方法。该方法基于相空间重构(PSR)、遗传算法(GA)和支持向量机(SVM)构建了声发射分区识别模型,并通过模型分类结果的图示法来实现Kaiser点的识别,本文将其称为基于PSR–GA–SVM的分区图示法(PPPGS)。该模型在测试集上取得了94.37%的识别准确率,其他评估指标同样表现优异。PPPGS识别出的Kaiser点与切线-交点法的结果相近,但准确率更高。同时,分类模型的特征重要性评分中,PSR提取的分形维数仅次于累计AE计数,排名第二,验证了其作为分类特征的重要性和可靠性。最终,将其应用于中国贵州深部磷矿的原位应力测量,验证了PPPGS的实用性。

 

Intelligent identification of acoustic emission Kaiser effect points and its application in efficiently acquiring in-situ stress

Abstract: Large-scale underground projects need accurate in-situ stress information, and the acoustic emission (AE) Kaiser effect method currently offers lower costs and streamlined procedures. In this method, the accuracy and speed of Kaiser point identification are important. Thus, this study aims to integrate chaos theory and machine learning for accurately and quickly identifying Kaiser points. An intelligent model of the identification of AE partitioned areas was established by phase space reconstruction (PSR), genetic algorithm (GA), and support vector machine (SVM). Then, the plots of model classification results were made to identify Kaiser points. We refer to this method of identifying Kaiser points as the partitioning plot method based on PSR–GA–SVM (PPPGS). The PSR–GA–SVM model demonstrated outstanding performance, which achieved a 94.37% accuracy rate on the test set, with other evaluation metrics also indicating exceptional performance. The PPPGS identified Kaiser points similar to the tangent-intersection method with greater accuracy. Furthermore, in the feature importance score of the classification model, the fractal dimension extracted by PSR ranked second after accumulated AE count, which confirmed its importance and reliability as a classification feature. The PPPGS was applied to in-situ stress measurement at a phosphate mine in Guizhou Weng’an, China, to validate its practicability, where it demonstrated good performance.

 

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