Research and application of overlying strata fissures spread in fully mechanized coal caving mining technology

摘要

Through theoretical analysis and numerical simulation methods, research the thick seam of high gas condition in Fully Mechanized Coal Caving Mining Technology, due to the impact of mining before and after work face, at the top cover rock fissures evolution, closure and expansion law. Expatiate rock fissures distribution and wealth region in top cover work face. Use GD3Q-A/B rock drilling detector, to verify the conclusions of numerical simulation. Finally, according to Wangpo coal mine in Shanxi Province project to improve the effectiveness of gas deflate, put forward reasonable proposed about layout of gas deflate drill ings within the scope of the fracture zones, and evaluate the technical and economic effects.