Optimization of Support Parameters for Large-Section Open-Cut Roadways in Fully Mechanized Mining with Large Mining Height

The extensive adoption of large mining height technology and the progressive deepening of mining operations have presented formidable challenges to the safety of roadway support. The selection of roadway support configurations and their operational parameters is critically important in underground mining operations. Taking the open cut of Hongliu Coal Mine as the engineering background, this study conducts similar model experiments and field monitoring to evaluate the large-section open-cut support system. We aim to address unreasonable parameters and the low efficiency of this system in fully mechanized mining faces with large mining heights. The results demonstrate that deformation and failure initially occur at the cut corners. According to field observation data, the convergence of the system’s two sides across the three measuring stations is markedly greater than the roof subsidence on average (104.9 mm vs. 46.0 mm). This indicates the collapse of surrounding rocks on both sides. The peak abutment pressure of the cutting hole occurs approximately 16 cm from the coal wall (scaled to 3.2 m on site).