Application Research on the Key Technology of Roof Cutting and Retaining Roadway in High Ground Stress Thick Coal Seam Fully Mechanized Caving Face
Aiming at the coal pillars with a certain width left between the original working faces of Guhanshan Mine,there are problems such as resource waste,difficulty in supporting stress concentration in tunnels,and tight mining continuity during mining.By comprehensively using theoretical,simulation,and on-site testing methods,the technology of cutting top and leaving tunnels is proposed.The results show that the basic roof on the side of the goaf after top cutting falls with mining,and the gangue supports the overlying rock in a timely manner and suppresses its rotation and sinking.Propose to use anchor cables to strengthen the roof structure and ensure the stability of the goaf retaining roadway.The shrinkage of the rear side of the roadway along the goaf is 485 mm,the shrinkage of the top and bottom plates is 686 mm,and the bottom bulge is 500 mm.The main reason for the large bottom bulge is that there is 1-2 m of bottom coal left,and the strength of the bottom plate is low.After simple undercover repair,it can meet the requirements of secondary use,providing scientific reference for the implementation of goaf retaining technology in thick coal seam top coal caving mining conditions.
stress concentrationroof cutting pressure reliefretaining roadway along goafnumerical simulation
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