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Behavior and stability of a large-scale cut slope considering reinforcement stages

Behavior and stability of a large-scale cut slope considering reinforcement stages. Landslides (2009) 6:pp263–272 Gi-Chun kang . Young-Suk Song . Tae-Hyung Kim. 授課老師 : 林昭遠老師 學號 : 79842019 報告人 : 陳則佑. 大綱. 前言 研究區域概述 原理與方法 結果與討論 邊坡穩定分析 結論. 前言.

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Behavior and stability of a large-scale cut slope considering reinforcement stages

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  1. Behavior and stability of a large-scale cut slope considering reinforcement stages Landslides (2009) 6:pp263–272 Gi-Chun kang . Young-Suk Song . Tae-Hyung Kim 授課老師:林昭遠老師 學號:79842019 報告人:陳則佑

  2. 大綱 • 前言 • 研究區域概述 • 原理與方法 • 結果與討論 • 邊坡穩定分析 • 結論

  3. 前言 • 韓國，山區覆蓋約70％的土地總面積。許多崩塌經常發生在施工階段，嚴重影響人為安全和財產損失;因此須設計適當的對策，減少邊坡破壞使災害影響減低至最小程度。 • 本研究利用穩定樁、土釘和地錨加強邊坡穩定，並在不同的施工階段進行數值分析和實地監測。

  4. 研究區域概述 裂縫3 鑽探1 裂縫2 鑽探2 裂縫1 鑽探3

  5. 崩積土 風化土壤 粉質黏土 風化岩 軟岩 地下水位 總應力 凝聚力 摩擦角 土壤模數

  6. 原理與方法 填土 地錨 開挖 穩定樁 土釘和排水管 穩定樁

  7. 傾斜管 • 量測穩定樁的變形 • 應變計 • 量測穩定樁應變的變化量和估算樁的彎曲應力的變化量。 • 水位計 • 量測不同高度的地下水位高度 地錨 上邊坡 穩定樁 下邊坡 高速公路施工平面概述圖

  8. No.37(上邊坡) No.51(下邊坡) 變形量 結果與討論 地錨 最大變形量 崩積土 風化土壤 深度 粉質黏土 風化岩 軟岩 A-A斷面各階段樁的變化量

  9. 上邊坡 No.51 下邊坡 地錨 最大彎曲應力 A-A斷面各階段樁的彎曲應力變化量

  10. 上邊坡 下邊坡 變形量明顯增加 開挖 階段 各階段樁的最大變化量

  11. 開挖 階段 第三場 第二場 地下水 小於0.5m 地下水 地下水 累計雨量 第一場 時間 降雨和地下水對每個階段樁的最大變化量

  12. 邊坡穩定分析 • 本研究使用SLOPILE(v3.0) • 進行邊坡穩定分析。 • SLOPILE利用無限邊坡的原理基於Fellenius和Bishop簡化方法量測平面破壞和圓弧破壞。 SLOPILE流程圖

  13. 上邊坡 下邊坡 地錨 分析數值 量測數值 分析數值和量測數值的比較

  14. 增加約0.3 F.S. 時間 Dry condition Rainy cindition 安裝排樁後F.S.>1.5 安裝排樁後F.S.>1.2 穩定 穩定

  15. 結論 • The deflection of piles was increased gradually as the reinforcement work processed. Also, the maximum deflection and bending stress of piles were measured at the part of colluvial soils including the silty clay layer. • The most critical stage among the reinforcement stages was the soil-nailing work stage. This increasing of pile deflection was influenced by the excavation before installing soil nails.。 • The safety factor of the slope gradually tends to increase subjected to reinforcement stages. The safety factor was rapidly increased after installing piles in the upper part, and that was increased gradually in the lower part. The safety factors are satisfied with the allowable sta-ndard value in both dry and rainy conditions.

  16. 謝謝聆聽

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