FAN Xinyu, JIA Zhixian, BAI Xueliang, YANG Tianjun, LIU Yong. 2019: CLASSIFICATION OF EXTREMELY SOFT ROCK TUNNELS USING COMPREHENSIVE EVALUATION MODEL OF ENTROPY-WEIGHTED FUZZY. JOURNAL OF ENGINEERING GEOLOGY, 27(6): 1236-1243. DOI: 10.13544/j.cnki.jeg.2018-310
    Citation: FAN Xinyu, JIA Zhixian, BAI Xueliang, YANG Tianjun, LIU Yong. 2019: CLASSIFICATION OF EXTREMELY SOFT ROCK TUNNELS USING COMPREHENSIVE EVALUATION MODEL OF ENTROPY-WEIGHTED FUZZY. JOURNAL OF ENGINEERING GEOLOGY, 27(6): 1236-1243. DOI: 10.13544/j.cnki.jeg.2018-310

    CLASSIFICATION OF EXTREMELY SOFT ROCK TUNNELS USING COMPREHENSIVE EVALUATION MODEL OF ENTROPY-WEIGHTED FUZZY

    • This paper introduces the fuzzy mathematics theory to solve the defects of traditional methods that are insufficient consideration of complexity in extremely soft rock classification. It establishes the evaluation indexes with total uniaxial compressive strength,drill core quality RQD,spacing of discontinuities,conditions of discontinuities,water content and dry saturated hydroscopic moisture ratio of rock. It adopts the entropy method to calculate index weight so as to avoid subjectivity of evaluation index assignment. Thus,an entropy weight fuzzy based comprehensive evaluation model for rock classification is established. This model is applied to a hydropower station tunnel in Indonesia. It chooses 15 tunnel sections for evaluation. The results show that the surrounding rock are mainly class Ⅳ or Ⅴ. The results are highly consistent with tunnel support types that are determined on site. It is considered that the classification results of this model are better than the traditional RMR classification method through comparison and analysis. It shows that the fuzzy mathematics can solve the complexity and fuzziness problems of extremely soft rock influencing factors. The entropy weight method can reduce the subjectivity of human factors. The combination of the two methods can achieve objective evaluation. This approach can provide reference for the classification of extremely soft rock tunnel.
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