Analysis and Study on Max Height of Water Flowing Fracture Zone in Fully Mechanized Top Coal Caving Mining Face in Horizontal Seam

Under the horizontal seam condition,the discrete element simulation method was applied to analyze the movement features of the overburden strata above the fully mechanized top coal caving mining face.According to the displacement and stress migration law of the overburden strata,the height of the water flowing fracture zone in the overburden strata was determined.The verification of the mine site measurements showed that the fracture zone height measured with the numerical simulation was well fitted with the actual measured results and the application of the numerical simulation method could be feasible to determine the height of the water flowing fracture zone in the overburden strata above the fully mechanized top coal caving mining face.