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題 名 | 基樁承受側向荷載後之表面摩擦特性=Characteristics of Skin Friction of Laterally Loaded Pile |
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作 者 | 張增宏; 蔡雅惠; 鄭百成; 張惠文; | 書刊名 | 臺灣公共工程學刊 |
卷 期 | 2:1 民95.06 |
頁 次 | 頁1-11 |
分類號 | 441.17 |
關鍵詞 | 側向荷載; 定體積摩擦試驗; 過壓密比; 樁-土界面; Lateral load; Constant volume friction test; Overconsolidation ratio; Pile-soil interface; |
語 文 | 中文(Chinese) |
中文摘要 | 基樁廣見於各項工程中,基樁藉由樁身之摩擦力與樁尖的支承力,將上部結構物之荷重傳遞到深層較堅硬之土層或岩盤上,而樁身摩擦力之大小與其所承受之側向應力有關。本研究以臺北粉質黏土為土樣,利用改良式直接剪力試驗儀,進行樁-土界面之定體積摩擦試驗,在試驗中以預壓密壓力與過壓密比等因素表示基樁承受側向荷載後之樁周土壤力學特性,探討樁表面摩擦特性。試驗結果顯示,樁-土界面之有效正向應力、摩擦比、有效應力路徑均受過壓密比影響。在相同初始有效正向應力時,當土壤之過壓密比愈大,樁-土界面之有效正向應力隨著界面滑動位移增加而遞增之速率愈大。且樁-土界面之極限摩擦比亦隨過壓密比之增加而增加。而於不相同預壓密壓力但相同過壓密比之情況下,所得之摩擦比曲線則趨近相同。本研究以過壓密比為參數,建立樁-土界面破壞前的過壓密土壤之理論摩擦比曲線模式。 |
英文摘要 | Pile foundation is popularly used in various constructions. It transmits the load of the superstructure to stiff soil or rock bed in deeper stratum by means of skin friction around pile and bearing capacity of the pile tip. However, the magnitude of skin friction is related to the lateral stress on pile. This study carried out a series of constant volume friction tests of pile-soil interface by the modified direct shear apparatus on Taipei silty clay. By changing reconsolidation pressures and overconsolidation ratios, this study investigate the characteristics of skin friction of the laterally loaded pile. The results exhibited that the overconsolidation ratio would affect effective normal stress, friction ratio, and effective stress path of soil. As the increasing of the overconsolidation ratio of soil, the increasing rate of effective normal stress due to the increasing of sliding displacement of interface became higher at the same initial effective normal stress. The ultimate friction ratio of pile-soil interface was raised with the increasing of the overconsolidation ratio. The friction ratio curves of pile-soil interface approximated to a similar curve under different preconsolidation pressures at the same overconsolidation ratio. This research established the theoretical model of friction ratio curve of overconsolidation soil by overconsolidation ratio before failure. |
本系統中英文摘要資訊取自各篇刊載內容。