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基于多钻进参数综合指标的岩性分类智能识别方法

Rock type identification based on comprehensive identification indexes of multiple drilling parameters

  • 摘要: 为解决传统煤巷顶板岩性探测实时性低、探测范围受限等问题, 提出了一种基于随钻探测技术预测岩性的方法。首先基于钻进参数构建破岩能量、逻辑回归概率和岩石硬度3种岩性分类综合指标, 然后分别建立概率分类模型和随机森林模型, 利用宏平均ROC分析得到模型参数, 最终实现基于多钻进参数综合指标的概率分类和随机森林模型的岩性分类智能识别。利用自主研发的实验室随钻探测平台, 开展了不同种类岩石拼接试件的随钻探测试验, 验证了该岩性分类智能识别方法的可靠性。结果表明: 3种岩性分类综合指标较采用单一钻进参数岩性分类的效果更好; 采用岩性分类综合指标的随机森林模型, 能够准确识别不同种类岩石拼接试件的拼接界面、岩石厚度和岩石类别, 预测准确率均高于92.9%, 查准率、查全率和F1-Score均高于88.7%。

     

    Abstract: To address the issues of low real-time responsiveness and limited detection range in traditional coal roadway roof type detection, a rock type identification method based on measurement while drilling (MWD) technology was proposed in this study. Firstly, three comprehensive indexes for rock type identification, namely rock-breaking energy, logistic regression analysis, and rock hardness, were established based on drilling parameters. Secondly, a probability classification model and a random forest model were established, and the model parameters were obtained by macro-average ROC analysis. Finally, intelligent rock type identification was achieved through both the probabilistic classification model and the random forest model, which were driven by the multi-parameter comprehensive indexes. With the aid of a self-developed laboratory MWD platform, MWD experiments were conducted on spliced specimens composed of different rock types to validate the reliability of the proposed intelligent identification method. The results demonstrate that the three comprehensive indexes outperform single drilling parameters in rock type identification. The random forest model, utilizing these comprehensive indexes, accurately identifies the splicing interfaces, rock layer thicknesses, and rock types in the spliced specimens, achieving a prediction accuracy of 92.9%. Additionally, the precision, recall, and F1-score of the model all exceed 88.7%.

     

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