Fracture Zonation for Overlying Strata in Underground Mining of Shallow Coal Seam

摘要

Overburden fractures are the passageways for water resource loss in underground mining. A new zonation for overburden movement was present through the analysis on hydraulic aperture and permeability according to numerical calculations. Fractured zone was divided into three parts, the upper, the middle and the lower and their heights were educed. In the bedding plane, end fracture development zone and middle fracture compaction zone were defined and their range was calculated out. The achievements can be used for water resource conservation and gas prevention or drainage, etc.