Fuzzy Multiattribute Decision-Making Model Based on an Improved DEAHP for Selection of a Shield Auxiliary Construction Method

Using a suitable shield auxiliary construction method (SACM) is crucial when encountering adverse geological conditions in tunneling. However, its current selection often relies on the experience of the project team and is normally limited in scientific reasoning. This paper proposes a novel decision model based on the fuzzy multiattribute decision-making method (FMDM) using the group decision theory. The proposed revised data envelopment analysis and analytic hierarchy process (R-DEAHP) method is derived by introducing a general consistency solution formula to strengthen the consistency of the judgment matrix. The model is programmed to deal with five adverse geological conditions typically encountered in coastal areas. The project costs (U1), construction time (U2), engineering complexity (U3), and environmental protection (U4) are determined as the evaluation indices. The comparisons of the R-DEAHP and previous studies indicate that the R-DEAHP avoids the frequent occurrence of equal weights of influence factors and produces true weights and the best local priorities. The weight ranking of evaluation indices obtained from the R-DEAHP is U1 > U2 > U4 > U3. The applicability and feasibility of the SACM decision-making schemes based on the FMDM for soft-hard uneven strata and local hard rocks are verified by their engineering applications in Xiamen Metro Line 4. The statistical analysis of field data demonstrates that the SACMs suggested by the FMDM effectively reduce shield attitude deviations and optimize tunneling operational parameters. The proposed approach is a new theoretical attempt regarding the SACM decision and provides a useful tool for the operational management of actual tunneling projects.