Chen Luwang, Wang Yingxin, Ou Qinghua, et al. 2021. Prediction model for development height of water-conducting fractured zone during mining near loose stratum considering influence of overburden structure:A case study of Huaibei coalfield[J]. Journal of Engineering Geology, 29(4): 1048-1056. doi: 10.13544/j.cnki.jeg.2021-0319.
    Citation: Chen Luwang, Wang Yingxin, Ou Qinghua, et al. 2021. Prediction model for development height of water-conducting fractured zone during mining near loose stratum considering influence of overburden structure:A case study of Huaibei coalfield[J]. Journal of Engineering Geology, 29(4): 1048-1056. doi: 10.13544/j.cnki.jeg.2021-0319.

    PREDICTION MODEL FOR DEVELOPMENT HEIGHT OF WATER-CONDUCTING FRACTURED ZONE DURING MINING NEAR LOOSE STRATUM CONSIDERING INFLUENCE OF OVERBURDEN STRUCTURE: A CASE STUDY OF HUAIBEI COALFIELD

    • In coal mining near the loose layer,the water-conducting fractured zone of overlying strata connected with the overlying aquifer can lead to the occurrence of roof water disaster. When other mining factors are similar,the roof overburden structure of different mining working faces can lead to the great difference in development height of water-conducting fractured zone. Therefore,17 measured data of the development height of water-conducting fractured zone in overlying strata during mining near the loose stratum in Huaibei coalfield were selected as prediction samples. The vectors of one row and two columns were selected to quantify the roof overburden structure of the mining panel near the loose layer. The five influencing factors include coal seam mining thickness,coal seam dip angle,panel length,mining depth and loose layer thickness as the input data. Combined with the five factors,the measured development height of water-conducting fractured zone was thought as the output data. Then,based on the neural network with radial basis function,a prediction model for the development height of water-conducting fractured zone during mining near the loose layer considering influence of overburden structure was established. The model was applied to the Qingdong coal mine in Huaibei coalfield. Through the verification of borehole flushing fluid leakage and borehole color TV observation,the relative error of the model prediction result is 3.3%,which is much lower than the error of 19.2% of the empirical formula calculation result in relative mining specification. This method provides theoretical support for the reasonable determination of the development height of water-conducting fractured zone during mining near loose layer.
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