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There are numerous technical and methodological approaches for evaluating the rerouting of the Tian-Chang Tunnel. In this paper, a method that offers the simultaneous consideration and treatment of multidimensional and multicriteria factors has been adopted. Given the characteristics and scope of the diversion project in this paper, the analysis is based on a rigorous "multi-level and multi-criteria weighted evaluation method." This analytical method would be more systematic and structured, resulting in frequently more objective evaluation outcomes. For the comprehensive evaluation of the "Tian-Chang Tunnel rerouting project" presented in this paper, the "multi-level and multi-criteria weighted evaluation method" has been utilized.
The comprehensive evaluation of the project to reroute the Tian-Chang Tunnel is conducted hierarchically, beginning with objectives, targets, and criteria. Seven evaluation objectives are established, including "geological conditions of each scheme," "length of each scheme's route," "thickness of rock overburden in the tunnel," "long-term stability of each scheme," "power generation benefit assessment," "feasibility of each scheme's implementation," and "newly established western portal." There are 11 evaluation criteria at the next level: "tunnel rock layer collapse," "degree of rock fragmentation," "tunnel length," "project budget," "project duration," "rock above the crown," "stability of the newly established western portal," "increase in power generation capacity after each scheme's completion," "regulatory impacts," "excavation earthwork volume," and "reduction in original road maintenance mileage." The multi-level and multi-criteria weighted evaluation method is a systematic approach that employs a hierarchical structure to deconstruct complex multi-criteria assessment schemes from the top down, according to the hierarchy of objectives, targets, and criteria. It permits the accumulation of opinions or contributions from relevant technical experts in order to evaluate the relative strengths of each scheme. The evaluation method relies on evaluation parameters at the criterion level, and it provides qualitative descriptions and quantitative data as performance measures for these evaluation parameters based on the characteristics of each scheme. Comparing performance measures and assigning scores based on their relative quality. After weighting these scores based on the criteria, the scheme with the highest total score is considered the most optimal. This method facilitates the analysis and selection of recommended (or preferable) schemes.
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