ABSTRACT
Utility tunnels are underground structures that accommodate numerous infrastructure facilities, including power, telecommunication, gas, and water, inside an urban environment. Utility tunnels can efficiently employ underground space by integrating various infrastructure facilities into a single underground space. Nevertheless, utility tunnels are prone to various problems, including fire, floods, and intrusion. Hazardous gases created by a fire can impact utility tunnel workers and cause casualties. In Korea, utility tunnels are legally classified as enclosed facilities, necessitating the installation of gas detection sensors. Nevertheless, there are no explicit regulations regarding installation locations and intervals. Against this backdrop, this study examines and analyzes accident cases that occurred in Korea. Thereafter, we simulate fire incidents in power facilities using computational fluid dynamics analysis. The simulation involves the installation of gas detectors at regular intervals and the calculation of the diffusion time and trend of gas diffusion.
