Abstract: In deep tectonic stress area, shoulder bolt broken and failure phenomenon is prominent in coal roadway; and it’s easy to induce roof collapse accident. It is an immediate requirement to solve support failure problem. In view of “shoulder bolt breakage” in deep coal roadway under the action of tectonic stress, a mechanical analysis model of shoulder bolt is established to analyze the action of slippage of coal ribs along roof on bolts; and stress and deformation characteristics of shoulder bolt are gotten. Shoulder bolt breaking mechanism is discovered. Under slippage shear force produced by tectonic stress, bending deformation of bolt body happens; and the shear force of shoulder bolt is biggest in interface between coal seam and roof, where the bolt body is cut off easily. Focused on the problem of shoulder bolt breakage, “controlling and yielding coupling support” control technology is put forward. The research results have been successfully applied to engineering practice.

Key words: deep coal roadway, shoulder bolt, shear breakage, controlling and yielding coupling support