To address the inefficiency of existing support systems in preventing localized failures in deep roadways at the Jiaojia Gold Mine, this study integrates rock mechanics theory and engineering practice. Through field investiga-tions and analysis of typical failure patterns, advanced 3D structural plane scanning technology was employed to systematically master roadway rock mass failure characteristics and causes. A 3DEC discrete element software was used to develop a 3D numerical model for roadway excavation that simulates and analyzes the stability of various support schemes. An innovative diagonal bolt support scheme was proposed, specifically optimized for the complex stressenvironment of the surrounding rock. Numerical simulation results demonstrate that the optimized support system significantly enhances both global and local stability, effectively suppressing failure initiation and ensuring safe opera-tions in deep roadways. This solution not only improves support efficiency but also reduces construction costs, providing critical references and technical insights for stability control in fractured surrounding rock under deep mining conditions at the Jiaojia Gold Mine.