Quantitative analysis reveals that RMR classification significantly influences excavation speed and stabilization duration in tunnels, suggesting better planning strategies.
Tunnel construction is crucial for developing transportation infrastructure in regions with complex geological conditions, such as Macedonia, where mountainous terrains, variable rock masses, and high groundwater inflow often cause delays and cost increases of 20-30%. This study analyses how the Rock Mass Rating (RMR) classification impacts time efficiency in tunnel design and construction, aiming to identify optimal strategies for reducing time and risks in local projects. The methodology involves quantitative analysis of 341 tunnel segments with RMR values from 0 to 80, using field data, statistical methods, and comparisons with international projects. Results show that low RMR values enable rapid excavation (2.35-5.71 m/day) but require intensive stabilization (20-50 days) with measures like rock bolts, pipe umbrellas, and shotcrete, while high RMR values reduce stabilization time to 5-10 days. Technologies with smaller excavation steps (0.75 m) optimize time by 30-40%, particularly for 55-60 m² sections. Integrating RMR into planning reduces collapse risks by 15-20%, costs by 20-30%, and ensures economical and safe construction.
No takes yet. Share an insight, caveat, or question.
Gjorgjevska et al. (2025) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: