Study on Time-Dependent Failure Mechanisms and CBAG Differential Support Technology of Roadway in Steeply Inclined Coal Seam

In Sichuan Province, China, most coal seams that are mined steeply inclined; their roadways’ surrounding rocks asymmetric, with non-equilibrium deformations and unstable anchorage structures, thus making major safety hazards highly likely. Using field observations a universal distinct element code (UDEC) numerical simulation method, this paper analyzed the time-dependent failure of ventilation roadway Working Face 1961 Zhaojiaba Mine, revealing preconditions for such damage bidirectional deterioration mechanism deformation as well stress rocks. Moreover, built an mechanical model thick layer roof proposed cross-boundary anchor-grouting (CBAG) differential support technique. Calculations proved new was particularly effective in restraining expansion tension cracks, preventing slipping dislocation rock masses on curved side. The feedback engineering applications showed maximum development depths cracks arc straight inclined 150 m behind working face only 1.5 1.10 m, decreasing by 61.3% 47.6%, respectively, compared primary support. technology offers overall thick-layer bearing structure roadways, effectively large roadways seams.