Anchorage Supporting Design of Large-section Open-off Cut at Fully-Mechanized Caving Face and Study on Surrounding Rock Stability

In view of the production and geological condition of large-section open-off cut with the area of 7.5m×2.7m at North 1st fully mechanized caving face of Gongwusu Coal Mine,the anchor-supporting basis was put forward with the application of engineering analogy.28 supporting plans were stimulated with FLAC3D and the preliminary plan was determined according to the simulation effects.The feasibility of the plan was analyzed with physical analogue method.The stability of surrounding rock was assessed through actual measurement of roof abscission layer to test the rationality and reliability of the plan.