Abstract:
The Longwall working face has high mining intensity and advance speed. The original stress balance of overlying strata of the coal seam is altered in a short time. It could produce different degrees of deformations in the overlaying strata,which causes serious impacts and damages to underground mining activities and ground infrastructure. Understanding the temporal and spatial characteristics of strata movement and deformation caused by mining is essential to prevent and control related disasters. It is of great significance to coal mine safety production.Based on the influence function method used to predict the surface subsidence,through the transformation of relevant parameters and theoretical derivation,the method is extended to the calculation and prediction of the movement and deformation of underground rock strata,and the final two-dimensional mining subsidence prediction model and the dynamic two-dimensional mining subsidence prediction model of the overlying strata in the horizontal coal seam are established. The model has been used to predict and evaluate the damage effect of the overlying strata of the coal pillar,to evaluate the safety of coal mining under the water,and to optimize the strata of the gas extraction roadway,which shows that the model has good practicability.