Research on spatiotemporal evolution law of purification efficiency of collapsed coal and rock mass in goaf:Taking Lingzhida Coal Mine as an example
The construction of underground reservoirs in goaf is of great significance to the utilization of mine water resources.As the mine water passes through the collapsed coal and rock mass,suspended matter in the water will migrate and deposit,thereby affecting the purifi-cation efficiency of the collapsed coal and rock mass in the goaf,and thus affecting the water purification capacity and service life of the underground reservoir in the goaf.The hydrodynamic dispersion equation considering the source and sink terms was used as a mathematical model to describe the migration and deposition process of suspended matter in the collapsed coal and rock mass in the goaf,and the varia-tion law of suspended matter concentration with the length of the process in the goaf was studied.The service life of the underground reser-voir in the goaf of Lingzhida Coal Mine was estimated,and the influence of retention factor on the service life of the underground reservoir in the goaf was analyzed,providing a theoretical basis for evaluating the service life of the underground reservoir in the goaf.
goafwater purificationcollapsed coal and rock masspurification efficiencyspatiotemporal evolution
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