Influence of rock bolting on stability of drifts in thick seams of weak coal (research on models).
Abstract
According to the current temporary instruction, it is recommended to use rock bolting only in rocks of strength not lower than 3 (on the scale of M. M. Protodyakonov). According to preliminary calculations, the use of rock bolting in the drifts through thick coal seams, in particular, at the Kuzbass hydro-mines, should give a significant technical and economic effect. Since the coal strength factor of thick coal seams often does not exceed 0.3-0.5, and the coal mass is characterized by significant fracturing, it was necessary to justify the possibility of using rock bolting in difficult conditions. In this connection it was necessary to reveal the character of deformation of weak fractured coal near the mine workings, secured with rock bolts at different dip angles of seams ...
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