土工基础

›› 2014, Vol. 28 ›› Issue (5): 39-41.

• 工程实录 • 上一篇    下一篇

黄河冲积平原区PHC管桩的挤密效应研究

江 浩1，吕颖慧2   

  1. (1.山东电力工程咨询院有限公司,济南  250013;2.济南大学，济南  250022)
  • 收稿日期:2014-07-02 出版日期:2014-10-20 发布日期:2014-10-28
  • 作者简介:江浩（1982-），男，工程师，研究方向为岩土工程勘察。

Compaction Effects of PHC Pipe Piles in Alluvial Plains of Yellow River

JIANG Hao1, LV Yinghui2   

  1. (1.Shandong Electric Power Engineering Consulting Institute Co., Ltd., Jinan, 250013;
    2.University of Jinan, Jinan, 250022）
  • Received:2014-07-02 Online:2014-10-20 Published:2014-10-28

摘要： 依托黄河冲积平原区某电厂工程项目，对工程场地进行原位测试和室内土工试验，研究了PHC管桩对地基土的挤密效应。结果表明，随着桩径向距逐渐变小，土体受到的挤密效果逐渐增强；随着粘粒含量的增加，土体受到的挤密效果逐渐减弱，对粉土和砂土的挤密效果明显强于粘性土；PHC管桩可消除桩间地基土液化性和提高其强度，使桩区附近土体液化等级降低，但其作用随距离增大而减小。

关键词: PHC管桩, 挤密效应, 液化性

Abstract: The soil properties are affected by the compaction effect of Prestressed High Concrete (PHC) pipe pile installations. The case history of a PHC pipe pile installations for a power plant project in the alluvial plains of Yellow River is presented in this paper. The compaction effect of the PHC pipe piles are studied by comparing both the insitu and laboratory tests before and after the pile installations. The results indicate that the compaction effect increase with the reduction of pile spacing; the compaction effect reduces with the increase of the clay content in soils. The compaction effect is more obvious in silty and sandy soils than that of in clayey soils. If applied appropriately, the PHC pipe pile can be used to increase the shear strength of the surrounding soils and eliminate the liquefaction potential. The liquefaction degree can be reduced but this reduction is getting less effective with the increase of pile spacing.

Key words: PHC pipe piles, Compaction Effect, Liquefaction Potential