STUDY OF ROCK MASS CLASSIFICATION BASED OF A QUESTIONNAIRE

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  • アンケートに基づくトンネル施工時の岩盤分類に関する研究
  • アンケート ニ モトズク トンネル セコウジ ノ ガンバン ブンルイ ニ カン

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Abstract

Rock mass classification applied to a tunnel face under construction is composed of the engineering and geological factors of the rocks. Unfortunately, many of the classification factors are qualitatively described. At the present stage, an engineer's subjective judgments play an important role in rock evaluation. The present study aims to show the details of the above subjective system. Much of the data used to evaluate the rocks under construction are documents, sketches and so forth. In this study, questionnaires using the above qualitative data are distributed among experienced engineers. Results of these questionnaires are collected and analyzed by using the fuzzy sets theory. By numerical examples, we make empirical factors and the manner of decision making of an engineer clear.

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