Research on the influence of land reclamation on water inflow and the irrigation water regression coefficient in goaf of Buertai Coal Mine
Mine land reclamation is one of the primary approaches to address ecological environmental concerns in mining areas.However,the process leads to a substantial influx of irrigation water into the goaf,increasing mine water inflow and adversely affecting mine safety.Aiming at investigating the influence of land reclamation above the coal mine goaf on the mine water inflow,determining the irrigation water regression coefficient in the goaf,and coordinating the relationship between irrigation and reclamation in mining areas and coal mine production,the irrigation water regression coefficient in the goaf was studied by field experiment and numerical simulation.The results indicate that under multi-year average meteorological conditions,the irrigation water regression coefficient in the loess and sandy regions of the study area are 30.30％and 30.38％,respectively,and it takes 424 days for irrigation water to reach the goaf.The time required for irrigation water to reach the goaf is influenced by the thickness of the loose layer and the development height of the water flowing fractured zone,the required time is positively correlated with the thickness of the loose layer and inversely proportional to the development height of the water flowing fractured zone.The infiltration process of irrigation water exhibits a noticeable hysteretic effect,the thicker the loose layer,the more obvious the hysteretic effect and the smaller the monthly fluctuation of the irrigation water regression coefficient.
coal mine goafland reclamationmine water inflowirrigation water regression coefficientinfiltration process
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