Space-time Evolution Law of Overlying Strata Voids Based on Surface Subsidence Data Inversion
In order to clarify the relationship between overlyingstrata voids and surface subsidence,field measurement and numerical simulation methods wereused to analyze the surface subsidence and overlying strata voidsmeasurement data of similar working faces,calibrate the discrete element numerical model parameters of the study area,and study the evolution law of overlying strata voids.The results show that the surface subsidence process of the 42106 shallow buried working face is characterized by initial subsidence,rapid subsidence,slow subsidence,and stabilization.The surface subsidence speed at the measuring points shows a pattern of first increasing and then decreasing.The porosity of the overlying rock increases with the advance distance before full mining,and decreases with the advance distance of the working face after full mining.
overlying strata voidssimilar working facesparameter calibrationsurface subsidence
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