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  1. 紀要論文
  2. 琉球大学農学部学術報告
  3. 49号
  1. 部局別インデックス
  2. 農学部

地すべり土の残留強度と残留状態からの強度の回復に関する研究

http://hdl.handle.net/20.500.12000/3624
http://hdl.handle.net/20.500.12000/3624
8e4cb27c-37c9-4d7b-a7da-e840e64ab118
名前 / ファイル ライセンス アクション
KJ00000162638.pdf KJ00000162638.pdf
Item type デフォルトアイテムタイプ(フル)(1)
公開日 2008-02-14
タイトル
タイトル 地すべり土の残留強度と残留状態からの強度の回復に関する研究
言語 ja
作成者 中村, 真也

× 中村, 真也

ja 中村, 真也

Nakamura, Shinya

× Nakamura, Shinya

en Nakamura, Shinya

アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
主題
言語 ja
主題Scheme Other
主題 回復強度
言語 ja
主題Scheme Other
主題 再圧密
言語 ja
主題Scheme Other
主題 残留摩擦係数
言語 ja
主題Scheme Other
主題 垂直応力
言語 ja
主題Scheme Other
主題 粘土鉱物
言語 ja
主題Scheme Other
主題 リングせん断
内容記述
内容記述タイプ Other
内容記述 The reactivated landslide has been subjected to repeated sliding and recession since the geological age. The shear strength of the shear zone is reduced to the residual state during sliding, but could be recovered to some extent during the recession period. This study describes the residual strength characteristics and the strength recovery from the residual state by means of a ring-shear test, for landslide soils which showed a considerable variation in physical and mineralogical composition. 1. The appropriate relation was obtained in the whole range between the residual strength parameter φ, and the total of the contents of preferred-oriented clay minerals (smectite, vermiculite, chlorite mica) in the <420μm soil samples. The relationship between them was expressed as a chair-shaped curve and the transitional region in which control of φ, changed from the non-preferred-oriented minerals to the preferred-oriented clay minerals was clearly observed. It is indicated that the parameter of φ, could be estimated based on the relationship φ, and the total contents of preferred-oriented clay minerals in the <420 μm soil samples. 2. Based on the relationship between the residual friction coefficient and effective normal stress, the curvilineared residual strength envelope was divided into tow parts which are the lower half and the higher half of hte effective normal stress. The residual strength parameters were determined at each part, cr was not zero at the lower half of the effective normal stress while it was zero at the higher half, and φ, was greater at the lower half than that at the higher half. 3. The recovery of the shear strength of the samples contained high amount of sand particlessubjected to large-displacement sheaar by re-consolidation was clearly detected at the effective normal stresses below 150kPa. The recovery rate increased with the decreasing normal stress but the strength did not recover to the level of the fully-softened stregth. Furthermore, for the samples contained high amount of clay particles, the rate of decrease in the strength against the peak strength was gerat but the recovery rate was negligible at the whole normal stress. The differences between the recovered strength and the residual strength were 1°-4° for the samples contained high amount of sand. 4. Landslide soils containing high amount of silt and sand and dominating with quartz and feldspars showed a strong recovery of strength at effective normal stresses until 400kPa, due to the re-consolidation effect on the disturved thin-layer still existing on the shear surface in the residual state. In landslide soils dominating with quartz and feldspars but containin gconsiderable amounts of mica and chlorite, the recovery of strength was noticed at lower normal stresses but hardly seen at higher normal stresses. This is ascribable to the formation of residual shear surface due to the presence of preferred-oriented minerals at higher normal stresses. The recovery of strength was not essentially recognized in landslide soils dominated by prefered-oriented minerals such as smectite, due to the development of residual shear surface to make slickenside.
内容記述タイプ Other
内容記述 紀要論文
出版者
言語 ja
出版者 琉球大学農学部
言語
言語 jpn
資源タイプ
資源タイプ departmental bulletin paper
資源タイプ識別子 http://purl.org/coar/resource_type/c_6501
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
識別子
識別子 http://hdl.handle.net/20.500.12000/3624
識別子タイプ HDL
収録物識別子
収録物識別子タイプ ISSN
収録物識別子 0370-4246
収録物識別子タイプ NCID
収録物識別子 AN00250548
収録物名
言語 ja
収録物名 琉球大学農学部学術報告
書誌情報
号 49, p. 97-142
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