降雨による砂質斜面崩壊発生時の過剰間隙水圧と崩土の運動に関する水路実験研究

• 王 功輝

  京都大学大学院

• 佐々 恭二

  京都大学防災研究所

書誌事項

タイトル別名

• Study on the Excess Pore Pressure Generation at Failure and the Resulting Movement of Sandy Slope in Flume Test by Rainfall
• コウウ ニ ヨル サシツ シャメン ホウカイ ハッセイジ ノ カジョウ カンゲキ スイアツ ト ホウド ノ ウンドウ ニ カンスル スイロ ジッケン ケンキュウ

抄録

By using a small flume, a series of tests has been carried out to trigger rainfall-induced-slope failure. The detailed monitoring of excess pore pressure and the soil displacement revealed that a high excess pore pressure was generated not before the failure, but during the subsequent motion after the failure. The variation of shear stress, normal stress and pore pressure during failure shows that approximately full liquefaction failure could be initiated even when the soil was in naturally drained state in slopes. By using silica sand no. 7 (D₅₀ = 0.14 mm) and no.8 (D₅₀ = 0.0576 mm) and changing the samples' initial dry density and flume angle (20 and 30 degrees), the effects of grain size, initial density and flume angle on the generated pore pressure and fail-ure mode were analyzed. Results from tests of different initial densities show that there is an optimal density index for excess pore-pressure generation. Moreover, observed failure phenomena show that the failure mode was dependent greatly on the grain size and flume angle. In fact, flowslides were initiated in the tests on finer silica sand (no. 8) when the flume angle was 30 degrees, while in other tests, just retrogressive sliding ap-peared.

収録刊行物

• 地すべり

  地すべり 37 (2), 40-47_1, 2000

  公益社団法人 日本地すべり学会

キーワード

• 降雨
• 水路実験
• 斜面崩壊
• 液状化
• 間隙水圧
• 流動化

詳細情報

• CRID: 1390001204545344000
• NII論文ID: 10013010749
• NII書誌ID: AN00332562
• DOI: 10.3313/jls1964.37.2_40
• ISSN: 18843956
• ISSN: 02852926
• ISSN: http://id.crossref.org/issn/02852926
• NDL書誌ID: 6353996
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6353996
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可