Many mines in Guizhou
Province are in urgent need of renovation
to ensure harmonious operation and prolong their lifespan. The key
to successful renovation lies in the prudent selection of the appropriate
mining technologies. Therefore, a comprehensive investigation was
conducted on steep coal mines in Guizhou Province, and a comprehensive
evaluation framework was established. Spearman correlation analysis
was performed on various factors, selecting geological conditions
and working face parameters with high correlation as the input variables
and mining methods as the output variables. The optimal values of
each hyperparameter were determined through orthogonal experiments,
and the neural network structure was confirmed to be “17-9-3”.
Five variants of backpropagation (BP) algorithms were meticulously
tested, and a genetic algorithm optimizing the BP neural network (GA-BP)
was further assessed to improve the model’s prediction accuracy.
The accuracy of the model was evaluated via the coefficient of determination
(R
2) and mean squared error (MSE). The
research results indicated that the variable step–size algorithm
with a momentum term (VSS + MT) was the optimal algorithm for the
BP neural network. Additionally, the MSE values of the artificial
neural network and GA-BP neural network in the testing phase were
0.06 and 0.04, with prediction success rates of 70 and 90%, respectively,
and R
2 values of 0.79 and 0.85, respectively.
Thus, the GA-BP neural network demonstrated superior performance.
Finally, industrial application of the model was conducted on a working
face in the Zhong-Yu coal mine. The evaluation index for the working
face was “0.847, 0.09, 0.111”, suggesting that fully
mechanized mining should be adopted. The evaluation results were consistent
with the current production status of the mine, verifying the reliability
of the model in practical applications.