(2) Since the coal layer directly face sandy shale roof, caving and easy delamination, especially when the crossing angle is small faults, roof fall most likely, timely recovery process must be frame shift with pressure, improve the strength of the support bracket .
(3) When the working face partially meets the fold, it must follow the hard roof of the fold to recover, and at the same time lower the bottom mining height and timely support the coal gang.
(4) When the working face is partially treated with the bedding and the joint roof is relatively developed, the overall supporting strength must be increased, the amount of the top and bottom plates should be reduced, and the bottom mining height should be lowered, and the roof and coal gang should be supported in time.
Other measures should be made according to the specific conditions in the on-site mining process.
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