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発表 A new judgment method for long-term stability of rock as subgrade in snowy cold region

作成年度 2009年度
論文名 A new judgment method for long-term stability of rock as subgrade in snowy cold region
論文名(和訳) 新しい岩盤路床の安定性評価法について
論文副題
発表会 2009 International Joint Symposium between IEGS (Korea)、 NIRE and CERI (Japan)
誌名(No./号数)
発表年月日 2009/11/03 ~ 2009/11/05
所属研究室/機関名 著者名(英名)
防災地質チーム日下部 祐基(KUSAKABE Yuuki)
防災地質チーム伊東 佳彦(ITO Yosihiko)
防災地質チーム阿南 修司(ANAN Syuuji)
北海道開発局坂本 多朗(SAKAMOTO Taro)
抄録
Various rocks in Hokkaido were examined to establish a new judgment method for long-term stability of natural rock as subgrade in snowy cold region. Rocks were mainly collected from actual road construction site、 and rock type of them is sedimentary rock、 volcanic rock and pyroclastic rock. Sample number is twenty one. For the purpose、 saturated density、 water absorption、 P-wave velocity and unconfined compression strength of the specimen were measured after the repetition of freezing and thawing. Maximum cycle of freezing and thawing is 300、 and cycle number of 150 was adopted as a threshold for judging the long-term stability as subgrade from measurement result of actual subgrade rock which suffered freezing and thawing for several years. By comparing destruction cycles of each rock with measurement result for rock property、 the new judgment criteria can be evaluated as follows: 1. Saturated density is 2.2g/cm3 or more、 2. Water absorption ratio is 6% or less、 3. P-wave velocity is 3.0km/s or more、 and 4. Unconfined compression strength is 15MN/m2 or more. Rock which clears all of the criteria is judged to have long-term stability as subgrade in snowy cold region
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