Research on Evolution Law of Overlying Rock Fractures in Goaf of Close Range Coal Seams
The complex geological conditions caused by the distribution of mining fields,surrounding tunnels,and goaf areas pose unstable factors to the safety production of the mine.In response to the above issues,a theoretical modeling method is adopted to establish a mechanical model of the goaf roof,derive and analyze the deflection function of the roof bending and sinking,and use numerical simulation software to simulate and study the evolution law of overlying rock fractures in the goaf.Drilling exploration was conducted in actual coal mines,and the results showed that the development height of cracks in the overlying strata was between 1.3～3.4 m.The overlying strata were damaged but had a small impact range.The minimum thickness of stable rock layers between coal seams was 12.2 m,and the cracks had integrity and certain bearing capacity.
coal seam goafoverlying rock fracturesevolution lawdrilling detection
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