Decision-Making Analysis of Ground Support Selection in a Critical Mine Infrastructure Tunnel

This research focuses on addressing the significant challenges faced by a critical mining infrastructure tunnel, an essential part of a mining company’s operations. Set against the backdrop of increasing global demand for copper, primarily driven by the rise in electric vehicle and renewable energy industries, the study underscores the vital role of copper. The objective is to ensure the efficient and sustainable functioning of this crucial mining infrastructure. The study employs a blend of qualitative and quantitative approaches, including Cost-Benefit Analysis (CBA) and the Analytic Hierarchy Process (AHP), to evaluate and prioritize ground support alternatives. These methodologies are chosen for their ability to assess the economic viability, safety, and sustainability of the tunnel. Facing the tunnel’s degradation, which threatens safety and efficiency, the goal is to stabilize the structure through 2041. Insights are drawn from expert opinions via the Delphi method and empirical data from site and geological surveys to devise strategic, sustainable solutions for tunnel maintenance and expansion. The study’s multifaceted approach using the Delphi technique, CBA, and AHP addresses the tunnel’s technical, economic, and sustainability challenges. It’s critical for the tunnel’s role in the global copper supply and the company’s operations. Through AHP, ground support Types C and D were identified as optimal, with Type C using Steel Sets and closer bolt spacing with shotcrete, ensuring stability. Type D is preferred for its economic efficiency but still considers the minimum factor of safety requirement. uses shotcrete arches and wider bolt spacing without additional shotcrete, aligning with a 27.3% priority score for cost-effectiveness. These methods balance the tunnel’s technical needs with safety and cost considerations. The Delphi method validated the AHP findings, reflecting an expert consensus on Type D’s suitability. CBA provided the financial rationale, emphasizing Type D’s lower costs. Ultimately, the choice of Type D reflects a strategic analysis of immediate and future needs, combining technical diligence, cost efficiency, and long-term planning into a coherent decision-making process informed by a breadth of expertise. For future research on the Critical Underground Mine Infrastructure Tunnel should encompass environmental and social factors, enhancing overall sustainability and impact. It’s crucial to involve a diverse range of stakeholders, ensuring broad perspectives are considered. This inclusive approach will improve the effectiveness, acceptance, and long-term viability of such engineering and construction projects.