884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

（溫州市建筑設(shè)計(jì)研究院，325000）

［提要］通過五根直徑相同、樁長相近、位于同一場地的超長大直徑鉆孔灌注樁在拔力與壓力作用下的對(duì)比試驗(yàn)，分析抗拔樁與抗壓樁在變形性狀和荷載傳遞機(jī)理的相同性和差異性。試驗(yàn)結(jié)果表明，對(duì)于超長大直徑鉆孔灌注樁，樁側(cè)摩阻力總是上部土體首先發(fā)揮，而后逐漸傳遞給下部土體，樁側(cè)摩阻力均存在強(qiáng)化效應(yīng)和退化效應(yīng)，樁沉降（上拔）以樁身壓縮（伸長）為主；抗拔樁樁頂Q-s曲線呈陡降型，抗壓樁樁頂Q-s曲線呈緩變型，樁承受豎向上拔力所表現(xiàn)出來的剛度明顯小于承受豎向壓力所表現(xiàn)出來的剛度。

［關(guān)鍵詞］超長大直徑鉆孔灌注樁；抗拔；抗壓；對(duì)比試驗(yàn)

Comparative Test Research on Resistant Extraction and Pressure of Super-long and Large-diameter Bored Piles/Chen Yuelin (Wenzhou Architectural Design and Research Institute, Wenzhou 325000, China)

Abstract:Based on comparative test on resistant extraction and pressure of five super-long and large-diameter bored piles with same diameter and similar length in the same ground, the community and difference of distortion behavior and load transmission property are analyzed. The test results show that lateral friction on the top pile reaches the limiting strength earlier than that on the bottom, and the lateral friction is reinforced or weakened with load developing, and the set

tlement(ascending) is produced mainly by pile compressing(extending).Q-s curve is post nonlinear for resistant extraction and adagio nonlinear for resistant pressure, and pile rigidity is clearly less for resistant extraction than resistant pressure.

Keywords:large-diameter and super-long bored piles; resistant extraction; resistant pressure; comparative test