岩盤の破壊基準と長期強度に関する一考察

DOI Web Site 被引用文献6件 参考文献44件
  • 大久保 誠介
    Department of Geosystem Engineering, The University of Tokyo, Bunkyo–ku, Tokyo 113–8656
  • 福井 勝則
    Department of Geosystem Engineering, The University of Tokyo, Bunkyo–ku, Tokyo 113–8656
  • 新 孝一
    Geotechnical and Earthquake Engineering Department, Central Research Institute of Electric Power Industry

書誌事項

タイトル別名
  • Failure Criterion and Long-Term Strength of Rock.
  • ガンバン ノ ハカイ キジュン ト チョウキ キョウド ニ カンスル イチ コウサツ

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抄録

At first, study on loading-rate dependency of strength was briefly summarized. It is well known that uniaxial (unconfined) compression strength increases with loading rate. Though only limited data are available, some authors reported that confined strength increases with loading rate. Also, tensile strength obtained by uniaxial tension, indirect tension and bending tests increases with loading rate. Based on the summarized experimental results, a failure criterion in which loading-rate dependency of strength is considered was proposed；high criterion for high loading rate and low criterion for low loading rate. As an extreme case, long-term strength or failure criterion at extremely low loading rate can be obtained. The simplest form of the long-term strength is σ1 = a·σ3 where σ1, σ3 are major and minor principal stresses, and constant `a' varies from 2 to 6 depending on rock. For validation of the proposed failure criterion, rock stresses were plotted on σ1 vs. σ3 diagram. It was found that all data except one were plotted under the line σ1 = 4σ3. It is reasonable to consider that, in relatively stable rock mass, rock stress is maintained at a certain value or condition lower than a long-term strength. If so, this result supports the validity of the proposed failure criterion.

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  • 資源と素材

    資源と素材 115 (4), 213-218, 1999

    一般社団法人 資源・素材学会

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