Analysis on Numerical Simulation of Mine Strata Behavior Law in Shallow Depth Seam with Bulk Overbarden Soil and Thin Bedrock Overburden

In order to analyze the movement law of the strata above the first coal mining face in the seam with a shallow depth of bulk overburden soil and thin bas e bedrock, especially to analyze the roof initial pressurized and periodical pressurized distance to the UDEC software was applied to numerically simulate the pressure behavior law of the roof strata above the first coal mining face in Shenmu Huisen Liangshuijing Mine. Based on the circumstance, a site measurement was conducted.Th e results showed that the calculated value of the roof initial pressurized distance in the first coal mining face was about 40.0 m and the site measured distance was 32.8 m.The calculated value of the roof periodical pressurized distance was about 20 m, the site measured roof periodical pressurized distance was about 16.522.0 m and th e average distance was 19.5 m.The forced roof caving distance of 20 m could eliminate the roof initial pressured.The forced roof caving could be effectively to relax and reduce the roof initial pressurized strength and scale.The key to ensure the forced roof caving results is to improve the blasting operation quality of the roof forced cavi