Abstract:
For the in-depth study of protective layer mining fault area overlying rock fissure and overburden mining include stress, based on the similarity research methods, analysis of protective layer mining fault during crack evolvement, roof fault should force change trend, the migration characteristics of overlying strata.The results show that the protective layer mining is easy to cause the roof near the fault coal rock formation fault zone; rock roof increased significantly in the fault zone, the density curve is "W" shape; the bottom roof fault with the face close to show different changes and away from the table with the top cover rock stress; migration has time effect, overlying the same horizon with the advance of working face of subsidence and displacement show "waterfall" shaped distribution.