Study on Service Performance Assessment of Large River-Crossing Shield Tunnel Based on Index Correlation

As the service time of the large river-crossing shield tunnels grows, the types and number of tunnel structural diseases increase gradually, and the service performance of the tunnel decreases gradually under the combined influence of multiple defects. The disease detection data of Shanghai Yan'an East Road Tunnel during structural overhaul in 2015 are collected and compiled. The service performance assessment indexes are determined based on the defect detection data and actual working conditions of Yan'an East Road tunnel. Refer to relevant papers, norms, etc., to divide the assessment level of each index. The degree of association between the indexes is explored by the apriori algorithm in the data mining method. The influence matrix is constructed based on the magnitude of the correlation between the indexes. The calculation process of analytic network process (ANP) is modified according to the influence matrix to form a comprehensive assessment model of service performance of large river-crossing shield tunnel considering the correlation of indexes. Yan'an East Road river-crossing tunnel is taken as an example to conduct the demonstration application of the proposed comprehensive assessment model.