Optimization and application research on pressure relief parameters of high-stress roadway drilling in micro-disseminated gold mines

The stability control of surrounding rock in deep high-stress roadways is a significant challenge in mining engineering. This study investigates the optimization of drilling pressure relief parameters for such roadways in the Jinfeng Gold Mine of Guizhou. By integrating digital image correlation technology, similarity simulation experiments, numerical simulation, and field monitoring, we systematically analyzed the displacement evolution and crack development characteristics under varying drilling numbers and layouts. Key findings include: (1) The strain concentration zone around the roadway exhibits a butterfly-shaped distribution, and the presence of boreholes alters the stress structure of the surrounding rock. (2) A positive correlation exists between the number of pressure relief holes and the pressure relief effect. Considering both the pressure relief effectiveness and roadway maintenance cost, the optimal number of boreholes is determined to be six. (3) A triangular arrangement of boreholes provides a superior pressure relief effect compared to horizontal and longitudinal arrangements.The optimal spacing between boreholes in this configuration is 240 mm. Field application of the optimized scheme demonstrated a significant reduction in roadway deformation, with roof subsidence and convergence decreased by 63% and 40%, respectively. This indicates the proposed technique effectively controls the stability of surrounding rock in high-stress roadways and can be widely promoted.