Prediction of surrounding rock stability of coal roadway based on machine learning and its application
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摘要: 煤巷围岩稳定性分类对指导现场岩体工程设计、施工、管理具有重要的理论和工程实际意义。本文选取了影响煤巷围岩稳定性的7个关键指标,采用现场案例、调查问卷和文献计量等方法收集样本并建立了围岩稳定性分类数据库,基于6种机器学习方法分别建立了煤巷围岩稳定性分类预测模型。经模型计算得出,神经网络和改进的支持向量机模型具有较高的预测准确性。将模型应用于霍州矿区实际工程,结果表明,神经网络和改进的支持向量机方法预测精度高、可靠性好。Abstract: The classification of surrounding rock stability of coal roadway has important theoretical and practical significance for the design, construction and management of on-site rock mass engineering.This paper selected seven key indexes that affect the surrounding rock stability of coal roadway, collected the samples through field cases collection, questionnaires and literature measurement, and established the surrounding rock stability classification database.By drawing on six machine learning methods, this study established the classification prediction models of surrounding rock stability of coal roadway accordingly.Through model calculation, it is concluded that the Neural Network and the improved Support Vector Machine model have higher prediction accuracy.The model is applied to the actual project of Huozhou mining area.Results show that the neural network and the improved support vector machine methods have high prediction accuracy and good reliability.
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表 1 核函数种类
Table 1. Kernel function type
核函数名称 函数表达式 线性核函数 $K\left(x_i, x_j\right)=x_i^{\mathrm{T}} x_j $ 多项式核函数 $K\left(x_i, x_j\right)=\left[\gamma x_i^{\mathrm{T}} x_j+b\right]^d $ Sigmoid核函数 $K\left(x_i, x_j\right)=\tanh \left(\gamma x_i^{\mathrm{T}} x_j+b\right) $ 径向基核函数 $K\left(x_i, x_j\right)=\exp \left(-\gamma\left\|x_i-x_j\right\|^2\right) $ 表 2 数据库初始样本
Table 2. Initial samples of database
序号 σt σb σc H L N X 类别 1 80.12 9.23 50.90 750 7 0.90 100 4 2 45.40 9.38 45.40 532 15 1.71 70 3 3 24.31 6.89 63.50 296 12 0.87 100 3 4 72.27 4.83 47.20 350 16 0.96 15 2 5 58.00 13.65 58.00 162 24 2.05 100 1 6 43.60 3.42 4.96 303 17 0.38 15 5 7 73.83 4.84 19.90 288 12 0.97 25 2 8 48.51 5.66 48.10 430 14 1.05 70 3 ⋮ ⋮ ⋮ ⋮ ⋮ ⋮ ⋮ ⋮ ⋮ 140 37.45 7.09 51.80 255 11 1.10 40 2 表 3 围岩分类数据归一化
Table 3. Normalization of surrounding rock classification data
序号 σt σb σc H L N X 类别 1 0.91 0.48 0.62 1.00 0.00 0.29 1.00 4 2 0.39 0.49 0.55 0.66 0.11 0.65 0.67 3 3 0.08 0.29 0.79 0.29 0.07 0.28 1.00 3 4 0.79 0.12 0.57 0.37 0.12 0.32 0.06 2 5 0.58 0.84 0.71 0.07 0.23 0.80 1.00 1 6 0.36 0.00 0.00 0.30 0.14 0.06 0.06 5 7 0.81 0.12 0.20 0.27 0.07 0.32 0.17 2 8 0.44 0.18 0.59 0.50 0.10 0.36 0.67 3 ⋮ ⋮ ⋮ ⋮ ⋮ ⋮ ⋮ ⋮ ⋮ 140 0.27 0.30 0.64 0.22 0.11 0.38 0.33 2 表 4 6种机器学习算法的精度
Table 4. Accuracy of 6 machine learning algorithms
算法 精度/% 算法 精度/% RBF-SVM 96.4 提升法 71.4 神经网络 92.9 随机森林 85.7 决策树 64.3 k均值聚类 60.7 表 5 工程应用巷道参数
Table 5. Roadway parameters for engineering application
序号 矿井名称 巷道名称 σt σb σc H L N X 类别 1 李雅庄矿 6031巷 27.5 9.38 65.1 639.0 8.0 1.5 20.0 3 2 辛置矿 2-608巷 44.8 5.70 48.1 536.0 14.0 1.7 70.0 4 3 曹村矿 11-11071巷 46.1 7.20 46.1 142.0 8.0 0.7 20.0 2 4 2-10311.2巷 78.6 8.60 57.9 500.0 8.0 1.8 80.0 2 5 三交河矿 2-6011巷 58.0 13.70 58.0 221.0 24.0 1.1 100.0 2 6 2-5131巷 58.0 13.70 58.0 206.0 24.0 2.1 20.0 2 7 2-5081巷 58.0 13.70 58.0 218.0 24.0 2.1 20.0 2 8 六采区轨道巷 58.0 13.70 58.0 162.0 24.0 2.1 100.0 2 9 2上-3162 62.7 10.40 42.5 280.0 80.0 4.0 100.0 1 10 木瓜矿 9-2031巷 44.4 3.40 5.0 288.0 17.5 0.2 20.0 5 11 9-2011巷 44.4 3.40 5.0 256.0 17.5 0.2 25.0 5 12 干河矿 二采区回风巷 65.1 4.10 21.4 523.0 12.0 1.6 100.0 3 13 2-1081巷道 58.3 5.30 49.9 535.0 12.0 0.4 30.0 3 -
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