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In this paper, an attempt is made to apply the Fuzzy sets theory to a quantitative estimation for the possibility of accidents in a tunnel-face under construction. The method proposed here uses the degree of belonging and the similarity of Fuzzy clusters as the membership functions for the possibility of accidents. The proposed membership functions lead to a crisp value, namely “Possibility indicator”. In addition, “Fuzzy distribution entropy” is defined so as to know the certainty of the clustering parameters and Possibility indicator which are used. In order to verify the applicability of the proposed method, a estimation sample is demonstrated.

A PROPOSAL FOR A QUANTITATIVE ESTIMATION METHOD FOR THE POSSIBILITY OF ACCIDENTS UNDER TUNNEL CONSTRUCTION BY THE FUZZY CLUSTERING METHOD