Analysis of overburden migration law and induced surface subsidence in close coal seam mining

In order to analyze the movement law of roof overburden and surface subsidence induced by overburden failure in short-distance coal mining,physical and numerical simulation experiments are adopted to demonstrate the short-distance coal mining in a coal mine.The results show that in the process of mining,the stress of the original rock above the coal seam is disturbed and the energy is released,which induces the continuous deformation of the overburden.In the process of short-distance coal mining,the strata between upper and lower coal seams are fractured due to the overlying rock action of the upper and lower coal seams,which leads to the connection phenomenon of upper and lower goaf,and the pressure relief superposition area is formed in the energy release area.At this time,the induced effect on surface subsidence is most obvious and intuitive.Coal bed mining strata on the deformation failure pattern more intuitive than lower coal,coal seam under the dual compound effect of coal strata subsidence phenomenon more intense than on coal seam mining and the surface subsidence induced effect is bigger,the numerical simulation of the surface subsidence value of 3.7 m,similar to simulate the surface subsidence value of 5.6 m,and the theoretical calaculation is 5.279 m.The overall difference is small,and can verify each other.