Numerical Simulation Analysis of Optimization of Peripheral Rock Section in Large Inclination Angle “Three Soft” Roadway

In order to solve the problem of asymmetric deformation and damage of the surrounding rock in the transport road of Yiluo Mine 35050, the paper adopts the numerical simulation method of FLAC 3D, and establishes the numerical simulation models of four kinds of large inclination angle “three soft” coal seams with different cross-section shapes (straight-wall arch, rectangle, pentagonal heteromorphism, and right-angled trapezium), and investigates the mechanism of deformation and damage of the four kinds of roadways under the mining of the “three soft” seams with large inclination angle through numerical simulation. Through numerical simulation, we studied the deformation and damage mechanism of the four kinds of cross-section shapes of the roadway under the mining of “three soft” coal seam. By comparing and contrasting the four different support sections under the same stress field and unsupported condition of excavation, the distribution law of stress, displacement and plastic zone of the roadway perimeter rock was studied, and the optimal support section was obtained. The study further reveals the asymmetric stress distribution characteristics and deformation damage law of the roadway surrounding rock in the large inclination angle “three soft” coal seam, and analyzes the dynamic evolution of its progressive asymmetric deformation damage.