Risk Assessment Method and Application for Tunnel Lining Demolition Construction

The maintenance, reconstruction, and expansion of tunnels often require the removal of existing tunnel linings. However, there is a paucity of research on risk assessments during tunnel lining demolitions. In order to address this gap, we developed a risk assessment model for tunnel lining demolitions using a fuzzy hierarchy comprehensive evaluation and expert surveys. This model draws on on-site construction experience. A fuzzy hierarchy comprehensive evaluation assesses risk probability, while expert questionnaires evaluate risk loss. Our study applied this model to a tunnel project in Qinghai, determining that the overall risk level falls within category "V3", indicating acceptable risk. Nonetheless, ongoing vigilance and monitoring measures are necessary throughout the construction process. These findings contribute to a deeper understanding of tunnel lining demolition risk assessments for improving project management and safety.