Abstract: The main controlling factors for stability of roadway roof in wedge model have been proposed in response to the structural characteristics of crossing coal seam roadway; meanwhile, mechanical model of roof cantilever beam for wedge segment has been established. Through static strength analysis and deflection calculation of this roof section, the formula for solving the minimum support resistance was obtained. By imputing engineering and geological conditions of Gucheng Mine of Lu’an Group into the resistance formula, it is concluded that the minimum support resistance in the model is 0.12 MPa. Corresponding anchor cable supporting scheme has been proposed considering safety factor as 1.4. Field industrial experiments and mine pressure monitoring results show that the supporting design scheme based on calculating support resistance can control roof deformation and maintain roadway stability.

Key words: crossing coal seam roadway, wedge structure roof, stress analysis, deflection, support resistance