Scheme Design and Engineering Application of Gangue Filling in Mine Goaf
Gangue filling can not only effectively solve the environmental problems caused by a large amount of gangue accumulation,but also effectively prevent the roof collapse of goaf and control the surface subsidence.Aiming at the problem of surface subsidence in mine goaf,the development characteristics of'three zones'are obtained by using three-dimensional seismic exploration technology,and the spatial distri-bution of underground goaf is inverted.The numerical calculation method is used to simulate the transporta-tion characteristics of gangue filling pipeline in goaf under different engineering parameters,and the differ-ence of slurry velocity distribution and fluidity settlement law is analyzed.Directional wells and vertical wells are set as controls to further carry out on-site evaluation and verification of filling effects.The results show that the effective grouting depth of the two filling methods is about 60 m above the coal seam roof,and the filling rate in the effective filling space of the directional well is about 40%higher than that of the vertical well.Therefore,the gangue filling technology in goaf based on ground drilling provides a favorable way for gangue treatment and environmental protection.
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