基于GA-BP神经网络的边坡变形预测研究

Prediction on slope deformation using the method of GA-BP neural network

  • 摘要: 露天矿山高边坡的变形预测是保障矿山安全生产的重要手段。本文以西藏某矿山边坡为对象,采用高精度合成孔径干涉雷达对矿区南帮边坡进行了全天候位移监测,分析了边坡变形的基本规律;采用小波降噪理论对采集的位移监测数据进行了降噪处理,并且为了避免预测模型陷入局部极小值,引入遗传算法(即GA算法)整合进BP神经网络的训练步骤中,用于优化BP神经网络的初始权值和阈值设置,建立了GA-BP神经网络边坡变形时序预测模型,并与BP神经网络边坡变形时序预测模型进行对比分析。研究结果表明: GA-BP模型较BP模型的预测精度提高了10%以上,预测的平均误差仅有2.43%,模型收敛速度加快10倍以上,GA-BP的回归系数优于BP模型。因此, GA-BP模型预测边坡变形的精度、收敛速度、泛化能力均得到了提高,对矿山边坡变形预测更为可靠,可为矿山边坡安全生产提供保障。

     

    Abstract: The deformation prediction of high slopes in open pit mines is an important means to ensure the safety of mining production. This paper takes the slopes of a mine in Tibet as an object and uses high-precision synthetic aperture radar (SAR) interferometry to monitor the displacements of the southern slopes of the mining area in all weather conditions, and analyzes the basic law of slope deformation; The displacement monitoring data was denoised using wavelet denoising theory, and to prevent the prediction model from falling into local minima, genetic algorithm was introduced into the training steps of the BP neural network to optimize the initial weights and thresholds of the BP neural network. A GA-BP neural network slope deformation time series prediction model was established and compared with the BP neural network slope deformation time series prediction model. The research results show that the GA-BP model has improved the predictive accuracy of the BP model by over 10%, with an average prediction error of only 2.43%. The model convergence speed has increased by more than 10 times, and the regression coefficients of the GA-BP model are superior to those of the BP model. Therefore, the GA-BP model has improved the accuracy, convergence speed, and generalization ability of slope deformation prediction, making it more reliable for predicting slope deformations in mining areas and providing security for mining slope safety production.

     

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