Identification of Correlation between Demand Performances to Damage of Lining Concrete for Tunnel Management

摘要

Infrastructure maintenance is becoming increasingly important in Japan. Especially in Hokkaido, about 350 conventional construction method road tunnels have been constructed over the past 40~50 years. In the next ten years, the number of these conventional construction method road tunnels are aging and suffering from damage, deterioration and environmental attack. Also, the number of deteriorating tunnels is predicted to increase significantly in the near future at an astonishing speed. Therefore, many conventional construction method road tunnels will come to its rehabilitation stage, and almost tunnel linings must be maintenance or repair. This research project will be developed to the efficient tunnel maintenance system and a quantitative criterion from pictures of tunnel lining concrete using the life cycle cost theory. Firstly, demand performance of tunnel linings in cold region are identified by the Analytic Hierarchy Process (AHP) model based on the weights and consistency indices (CI) using the tunnel user, tunnel inspection engineer's and tunnel management engineer's interview. Secondly, the outline of conventional construction method road tunnel management system is illustrated and defects and problems to be overcome are clarified. And, many type of cracks and detailed items for evaluation of tunnel linings were set up based on the aforementioned interview using the AHP procedure. The proposed criterion was employed for some actual conventional construction method read tunnels in order to investigate the applicability. The tunnel lining crack evaluation results by using the proposed criterion were generally correct to results of detailed inspection at site. However, the evaluation for exfoliation of concrete was not always corresponding to the detailed.