Research on the Surface Movement Law and The Inversion of Surface Subsidence Prediction Parameters of Repeated Mining in Shallow Buried Deep Coal Seams
DOI:
https://doi.org/10.54097/njhfr352Keywords:
Repetitive mining, Laws of surface movement, surface fitting.Abstract
In order to explore the surface deformation law of multi-coal seam mining under repeated mining conditions, and deepen the understanding of the estimated parameters of surface subsidence in the mining area, in order to provide a technical reference for the " Mining under three" pressed coal mining in the mining area. Based on the measured data of the 22208 working face of the live chicken and rabbit mine; Two methods, curve fitting method and surface fitting method, were used to obtain the estimated parameters of surface subsidence; The results show that under the condition of repeated mining, the protective coal pillars left after the excavation of the upper coal will hinder the surface settlement of the lower coal mining, and the surface subsidence curve will be lifted. During the mining process of the working face, it is affected by repeated mining, which leads to the breaking of the overlying rock layer and the activation and development of fractures, so that the maximum subsidence of the surface exceeds the actual mining thickness of the coal seam of 22208. Comparing the fitting results of curve fitting and surface fitting, it is found that the accuracy of the fitting parameters of the inclined sinking coefficient, the main influence tangent of the tendency, the offset distance of the trend inflection point and the offset distance of the inclined left inflection point obtained by the surface fitting method are improved by 3.9%, 5.6%, 4% and 3.1%, respectively, and the accuracy of the fitting parameters of the inclined horizontal movement coefficient is significantly improved to 13.2%, which is not affected by the layout of the observation line, which is more in line with the actual needs of the project. The research results can provide a technical reference for repeated mining in shallow buried deep multi-coal seam mining areas.
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