Sustainable Decision-Making Framework for Multi-purpose Utility Tunnels Using TOPSIS
摘要
Utilities are in high demand and are a necessity worldwide, which requires constant improvement and upgrading. However, a lot of our utilities are still laid using traditional buried methods, which has now become a problem in both developed and developing nations due to their aging and “spaghetti” problem. Multi-purpose utility tunnels have been gaining popularity as it is known as a more sustainable alternative to our utility issues. The challenge that decision makers usually face is the expensive start-up cost of multi-purpose utility tunnels compared to the traditional buried utilities method, which makes the latter the preferred option most of the time. This study has developed a sustainability framework that considers four major aspects of sustainable construction, which looks into the social, economic, environmental, and technical aspects of the decision-making in order to arrive at the most optimal decision for utility distribution and laying, not just looking at the initial construction cost. TOPSIS was used as a simple and straightforward tool to rank the order of preference using a hypothetical case study. The eight most important criteria identified in the research were public safety, customer satisfaction, construction costs, operations and maintenance costs, greenhouse gas production, land, air, and noise pollution, design and constructability, and future upgrading and planning. Results show that given equal weighting importance to each criterion, MUT was the more sustainable option. It was also determined that even with a higher weight assigned to the sub-criteria of the economic aspects, that is, construction costs and operations and maintenance costs, MUT was still the more sustainable choice compared to the traditional buried method. Overall, MUT provides a sustainable alternative in our densely populated communities.