注浆成型螺纹桩接触面特性试验研究

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摘要为揭示新型注浆成型螺纹桩抗拔承载机制，对桩–土界面开展试验研究。借助自主研制的大型接触面剪切仪，量测普通桩土接触面与不同螺纹间距接触面的剪切应力与相对剪切位移关系，并观察桩土接触的破坏形态。试验研究表明，无螺纹桩–土界面产生平面形态破坏面，而螺纹桩–土界面呈现拱形曲线形态破坏；螺纹加固效应主要是增大桩土间的黏聚力从而提高桩土界面的抗剪强度；桩土界面上的螺纹间距存在某一最优值，可形成最大的拱形破坏面，从而螺纹桩–土界面将发挥最大抗剪强度。

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关键词 ：桩基础, 注浆成型螺纹桩, 抗拔桩, 接触面, 大型直剪试验

Abstract：In order to understand the uplift bearing mechanism of a new-developed grouting-screw uplift pile，experimental investigation of mechanical behaviors of the pile-soil interface was carried out. A large-scale self-developed shear apparatus is used to measure the shear stress-displacement of pile-soil interface and to observe the corresponding failure mode. Experimental results show that the non-screw pile-soil interface generates a failure plane，whilst the screw pile-soil interface produces an arch-curvature failure surface. The screwing effect on the pile-soil interface behavior leads to an increase in cohesion and shear resistance. There exist some critical interval spaces between the two neighboring screws，where the largest arch-curvature failure surface is reached and the maximum soil-pile friction resistance is activated.

Key words： pile foundations grouting-screw pile uplift pile interface large-scale direct shear test

收稿日期: 2013-05-02

引用本文:

钱建固1，2，陈宏伟1，2，贾鹏1，2，黄茂松1，2，胡玉银3. 注浆成型螺纹桩接触面特性试验研究[J]. 岩石力学与工程学报, 2013, 32(9): 1744-1749.
QIAN Jiangu1，2，CHEN Hongwei1，2，JIA Peng1，2，HUANG Maosong1，2，HU Yuyin3. EXPERIMENTAL STUDY OF MECHANICAL BEHAVIOURS OF GROUTING-SCREW PILE INTERFACE. , 2013, 32(9): 1744-1749.

链接本文:

http://www.rockmech.org/CN/Y2013/V32/I9/1744

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