| 研究生: |
黃意晴 Huang, Yi-Ching |
|---|---|
| 論文名稱: |
彰濱海床土壤動態性質模式之探討 Study on the Dynamic Property Model of Changbin Seabed Soils |
| 指導教授: |
倪勝火
Ni, Sheng-Huoo |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 土木工程學系 Department of Civil Engineering |
| 論文出版年: | 2023 |
| 畢業學年度: | 111 |
| 語文別: | 中文 |
| 論文頁數: | 128 |
| 中文關鍵詞: | 海床土壤 、雙曲線模型 、剪力模數 、阻尼比 、動態特性 |
| 外文關鍵詞: | offshore subsoil, hyperbolic model, shear modulus, damping ratio, dynamic properties |
| 相關次數: | 點閱:70 下載:5 |
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本研究以使用台灣彰濱海床土壤重模試體進行室內試驗所得到之數據相互搭配獲得土壤的完整動態特性曲線並進行模擬,經由使用Hardin (1978)之最大剪力模數模型及Darendeli (2001)之雙曲線模型取得土壤動態性質曲線之模型參數,由此探討平均有效圍壓、孔隙比、飽和度以及細粒料含量等四項土壤參數對土壤動態性質模型之影響,並將由預測模型求取之剪力模數與室內試驗所得之試驗值進行比較。
研究結果顯示,最大剪力模數會隨著平均有效圍壓增加而增加,並隨孔隙比增加而減少。正規化剪力模數衰減曲線之參考應變與平均有效圍壓、孔隙比、飽和度成正相關,而與細粒料含量成負相關;曲率係數主要與平均有效圍壓有關並與其呈正相關。其中,參考應變及曲率係數與平均有效圍壓之關係可由經驗公式表示。然而,阻尼比曲線的部分則因雙曲線函數之特性而導致曲線模擬結果與試驗結果於平均有效圍壓大小對阻尼比曲線之影響不相符。
This study investigates the complete dynamic properties of Taiwan Changbin offshore soil by combining the data obtained from laboratory tests using reconstituted soil specimens. The soil behavior is simulated using the maximum shear modulus model proposed by Hardin (1978) and the hyperbolic models proposed by Darendeli (2001) to determine the model parameters of the soil dynamic properties. Four soil parameters, namely average effective stress, void ratio, saturation, and fines content, are examined for their influence on the soil dynamic property models. The predicted shear modulus values from the proposed model are compared with the experimental values obtained from indoor tests.
The results indicate that the maximum shear modulus increases with an increase in average effective stress and decreases with an increase in void ratio. The reference strain of the normalized shear modulus degradation curve is positively correlated with average effective stress, void ratio, and saturation, while it is negatively correlated with the fines content. The curvature coefficient is mainly related to the average effective stress and shows a positive correlation with it. The relationship between the reference strain, curvature coefficient, and average effective stress can be represented by empirical formulas. However, the damping ratio curve is not well represented by the hyperbolic function due to its characteristics, which results in discrepancies between the curve simulation and test results concerning the influence of average effective stress on the damping ratio curve.
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