Study on the Stability of Surrounding Rock in Deep High-Stress Soft Rock Roadways at Jining No. 2 Coal Mine

In response to the challenges of large deformation and difficult support in deep high-stress soft rock roadways, this study takes the 133 Upper 03 Comprehensive Mining Face Track Roadway at Jining No. 2 Coal Mine as the engineering background. Through on-site surveys and laboratory tests, the causes of deformation and failure in the surrounding rock were analyzed. Based on the principle of collaborative support for roadways, a support scheme combining "bolts + cables + shotcrete + deep and shallow hole grouting + inverted arch" was proposed. The results of on-site monitoring indicated that, after implementing the collaborative support scheme, the maximum floor-to-roof convergence was 24.1 mm, the maximum sidewall convergence was 17.4 mm, and the maximum delamination was 7.8 mm, all within acceptable limits. Additionally, the surrounding rock showed no significant cracking, and the grouting effectively bonded the fractured rock mass, verifying the effectiveness of the collaborative support scheme.