Prediction method for surface movements and deformation induced by extra-thick steeply inclined coal seam horizontal slice mining

The strata and surface movements have notable features of repeatedly mining subsidence cumulation,when extra-thick steeply inclined coal seam applied horizontal slice mining.And new prediction model was needed to establish for describing the shape of subsidence basin.Based on analysis of a large number of field observed data and similar model test,according to the strata and surface movements mechanism,and subsidence propagation direction characteristics of the of steeply inclined coal seam mining,a prediction model was established which was based on shifty variation propagation angle of extraction of extra-thick steeply inclined coal seam applied horizontal slice mining.A Boltzmann fitting relationship between subsidence coefficient and thickness of coal seam,mining depth,dip angle of coal seam was put forward at condition of full and non-full slice mining.An approach to determine the prediction model's parameters was proposed.The prediction results of the surface movements shows that the prediction model can better reflect the actual law,the parameters is clear in physical meaning,easy to determine.