Leakage risk assessment of cofferdam tunnels based on combined weighting-cloud model
Jianping Fang, Xiaoyi Shi, Mengxi Zhang · 2023
To ensure the construction and operation safety of the cofferdam tunnel, it is necessary to evaluate the leakage risk of the tunnel. Based on the AHP-DEMATEL combined weighting method, considering the mutual influence between the same-level indicators, a three-level evaluation index system for cofferdam tunnels is constructed from four aspects: engineering and hydrogeology, construction quality, structural deformation and stability, and structural damage. Using the cloud model, we determine the degree of membership of each index to the risk level. Through fuzzy mathematics, comprehensively judge the water leakage risk level of the cofferdam tunnel. Taking the Heyi Road Crossing River Tunnel in Quzhou City as an example, the membership degree of each index is calculated. According to the principle of maximum membership degree, we determine the tunnel&s;s water leakage risk level and verify the method&s;s effectiveness. This method can effectively predict the occurrence of water leakage diseases in tunnels and provide a theoretical basis for similar projects in the future.