Steeply dipping seam refers to the coal seam with dipping angle in the range of 35°～55°, which is well recognized to be very hard to mine by the mining industry all the world.Based on physical simulation test, some fundamental researches focused on the rock strata breaking and moving process, Rock structure stability mechanism and control provide a theoretical basis for mining safely and efficiently in steeply dipping seam.The results indicated that time sequence and unbalance are main caving traits of main roofs, In tendency direction, the bedding separation initially emerge at the upper position (two-thirds) of roof beams, which induces tensile failure and roof caving shifting towards the upper parts of working face, which results in the critical layer zone conversion and change along inclination, forming scalar structure.Mechanics model and stability criterion of scalar structure is established and destabilization model of critical layer rock is revealed.
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