あるＶ字谷におけるシーティングの力学的背景に関する研究

DOI Web Site 被引用文献1件 参考文献8件
  • 藤井 義明
    Division of Structural and Geotechnical Engineering, Graduate School of Engineering, Hokkaido University, Kita–ku, Sapporo 060–8628
  • 石島 洋二
    Division of Structural and Geotechnical Engineering, Graduate School of Engineering, Hokkaido University, Kita–ku, Sapporo 060–8628
  • 堀場 夏峰
    Technical Research Institute, Nishimatsu Construction Co. Ltd.
  • 稲葉 力
    Technical Research Institute, Nishimatsu Construction Co. Ltd.

書誌事項

タイトル別名
  • A Study on Mechanical Backgrounds of Sheeting Joints in a V-shaped Valley.
  • アル Vジダニ ニ オケル シーティング ノ リキガクテキ ハイケイ ニ カン

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抄録

There are a considerable number of sheeting joints at a V-shaped valley in Japan, which is a construction site for a P-Dam. Sheeting joints could cause water leakage and reduce the strength of rock mass as a dam foundation. The mechanical backgrounds of sheeting joints were therefore investigated. In-situ stress measurement by the stress relief method revealed that maximum horizontal stress, which is almost perpendicular to the P-River, is about 12 MPa. This result coincides with results obtained by the Deformation Rate Analysis method. It was also clarified that the temperature in rock mass shows large day-variation as deep as 30 cm, and that a significant temperature gradient appears under direct sunlight. Through numerical analyses, it was determined that an inclined crack near a free surface can grow much longer than that in an infinite medium. From these points of view, it was considered that the sheeting joints are exfoliation as a result of crack propagation near the free surface under horizontal stress concentrated by the geometry of the V-shaped valley and periodically-acting horizontal thermal stress.

収録刊行物

  • 資源と素材

    資源と素材 114 (12), 869-874, 1998

    一般社団法人 資源・素材学会

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