Surface subsidence law caused by fully mechanized caving mining under railway

In order to ensure the safe running of the special railway for Guozhuang coal mine, the law of surface movement and deformation in goaf of the coal mine was studied on the basis of the analysis of the actual observation data, the monitoring scheme and control measures of railway under dynamic coal mining conditions were put forward in accordance with that. The results show that the surface movement and deformation are intense, the subsidence value is large, but the subsidence velocity is relatively small on account of fully mechanized caving; Surface subsidence coefficient, the main impact tangent tanβ, maximum subsidence angle are 0.76, 2.78, 89°. The total duration of surface movement is long, with the time of active period accounting for 58.7% and the subsidence amount in active period accounting for 89% of the total subsidence amount. Therefore, monitoring and prevention should be strengthened during active period.