Evaluation of Interpretation Criteria for Piles under Compression Loading

樁基礎受壓載重之詮釋法評估

陳梅竹(Maria Cecilia M. Marcos)；陳逸駿(Yit-Jin Chen)；張凱鈞(Kai-Chun Chang)

詮釋法 ； 打擊樁 ； 預鑽孔植入式PC樁 ； 場鑄樁 ； 排水土層 ； 不排水土層 ； 礫石層 ； interpretation criteria ； driven piles ； pre-bored PC piles ； drilled shafts ； drained soils ； undrained soils ； gravelly soils

先進工程學刊

9卷3期（2014 / 07 / 01）

177 - 182

英文

本研究用打擊式PC樁、預鑽孔植入式PC樁以及場鑄樁之靜載重試驗資料，評估樁基礎受軸向壓載之詮釋法。各種基樁在排水及不排水情況下，以不同的詮釋法檢驗各類基樁的載重位移曲線及行為關係。依分析結果，於各不同種類的基樁，每一種詮釋法所呈現之趨勢大致上相同。所有分析亦顯示DeBeer法之詮釋結果較低，可作為各詮釋法之低限值；而Chin法之值永遠大於量測結果，則可作為上限值之標準。經分析各載重－位移曲線，場鑄樁於卵礫石層之曲線呈現高度的韌性，打擊樁在排水土層則有較高的勁度。最後，本研究建立各種基樁於不同土層之正規化載重－位移曲線，同時顯現各詮釋法間之相互關係。

This paper presents an evaluation of interpretation criteria for deep foundations under axial compression loading. Static load test data on driven PC pile, pre-bored PC pile, and drilled shaft under drained and undrained conditions were subjected to various interpretation criteria and used to examine the relationships of load-displacement behavior of different pile types. The general trend of each interpretation method demonstrates similarity for all pile types. In all events, DeBeer method is the lower bound criterion and Chin method is the upper bound and is always above the measured data. The normalized load-displacement curve of drilled shaft in gravelly soils shows great ductility whereas the curve of driven pile in drained soils exhibits a stiffer response. Based on these analyses, the interrelationships of these criteria for different pile types under drained and undrained soils are established in terms of normalized capacity and displacement.