Strength Evaluation of Rockfill Materials Considering Confining Pressure Dependency

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  • YAMAGUCHI Yoshikazu
    独立行政法人土木研究所 水工研究グループダム構造物チーム
  • SATOH Hiroyuki
    独立行政法人土木研究所 水工研究グループダム構造物チーム
  • HAYASHI Naoyoshi
    独立行政法人土木研究所 水工研究グループダム構造物チーム
  • YOSHINAGA Hisayuki
    独立行政法人土木研究所 水工研究グループダム構造物チーム

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  • 拘束圧依存性を考慮したロック材料の強度評価
  • コウソクアツ イソンセイ オ コウリョシタ ロック ザイリョウ ノ キョウド ヒョウカ

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Description

It is necessary to evaluate shear strength of rock materials, which are major materials for a rockfill dam, considering the confining pressure dependency for the rationalized design and seismic performance evaluation of this type of dam. However, the triaxial compression test, which is the most common strength test for rockfill materials, has a problem in test precision under low confining pressure condition.<br>In this study, we carry out large-scale triaxial compression tests under low confining pressure, large-scale box shear tests, and laboratory and field surface sliding tests for rock materials. Based on results of these tests, we investigate the evaluation method of the shear strength of rockfill materials under low confining pressure condition. In addition, we discuss the setting method of the design strength of rock materials considering the confining pressure dependency.

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