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In this study, the performance-based evaluation factors for rock slopes have been deducted using Delphi- method. Validity of the result was verified through factor analysis. Performance of rock slope is classified as soundness, stability and durability. Through the Delphi survey, 17 factors including discontinuity orientation are deducted for soundness, 4 factors and 3 factors are selected for stability and durability, respectively. Validation is conducted using Exploratory Factor Analysis (EFA) for 24 factors, and all factors are found to be valid. As a result of Exploratory Factor Analysis (EFA), 3-types of performance were subdivided into internal soundness, external soundness, risk, damage and durability of slopes and protection (reinforcement) facilities.Key words Rock slopes, Performance evaluation, Delphi method, Factor analysis               ,       .    ,    .     ,   17  ,   ,    4  .    3   .     24    (EFA)  , 24        . ,     3    ,  , ,     /   . ,  ,  ,

A Study on Performance-based Evaluation Method for Rock Slopes : Deduction of Evaluation Factors