Supporting Parameters Optimization for Large-section Open-off Cut in Shallow-buried Depth Seam with Thin Bed Rock

To solve the influence of shallow-buried depth, thin bedrock, and easy weathering of surrounding rock on open-off cut support, using numerical simulation and theoretical analysis method, we use orthogonal test to optimize bolt support parameters. The results show that the compressive stress zone formed by a bolt further overlays with the decrease of row spacing; effective compressive stress range first increases and then decreases with the decrease of bolt length; roadway surrounding rock deformation reduces approximately logarithmic law gradually and tends to be stable; the principle of compensation is determined using a structured reinforcement anchor parameters. Scene surrounding rock deformation monitoring results show that the deformation of surrounding rock has been well controlled, the desired effect is achieved.