WEKO3
アイテム
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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 \u003c420μm 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 \u003c420 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. 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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/20.500.12000/36248e4cb27c-37c9-4d7b-a7da-e840e64ab118
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
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 | |||||||||
| タイトル | ||||||||||
| タイトル | Studies n Residual Strength and strength Recovery from Residual State for Landslide Soils | |||||||||
| 言語 | en | |||||||||
| 作成者 |
中村, 真也
× 中村, 真也
× 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 | |||||||||
| 主題 | ||||||||||
| 言語 | ja | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | 再圧密 | |||||||||
| 主題 | ||||||||||
| 言語 | ja | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | 残留摩擦係数 | |||||||||
| 主題 | ||||||||||
| 言語 | ja | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | 垂直応力 | |||||||||
| 主題 | ||||||||||
| 言語 | ja | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | 粘土鉱物 | |||||||||
| 主題 | ||||||||||
| 言語 | ja | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | リングせん断 | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | recovered strength | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | re-consolidation | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | residual firiction coefficient | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | normal stress | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | clay mineral | |||||||||
| 主題 | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | ring shear | |||||||||
| 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 | ||||||||||
| 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 | ||||||||||
| 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 | |||||||||
| 収録物名 | ||||||||||
| 言語 | en | |||||||||
| 収録物名 | The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus | |||||||||
| 書誌情報 |
号 49, p. 97-142 |
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