Abstract: Taking the open-off cut in 21208 working face of Chensilou Coal Mine as example, and according to the actual geological conditions of the working face, the once-tunneling construction technology of the large cross-section open-off cut in full-mechanized face is studied. The study provides a reference for other mines under similar condition by summarizing the advanced methods and successful experience.

Key words: Fully-mechanized face, Open-off cut, Large cross-section, Once-tunneling, Equipment installation