土工基础

›› 2014, Vol. 28 ›› Issue (2): 22-25.

• 工程实录 • 上一篇    下一篇

注浆钢管桩抗拔承载力试验研究

马忠政   

  1. （上海申通地铁集团有限公司，上海 200042）
  • 收稿日期:2014-02-25 出版日期:2014-04-21 发布日期:2014-04-25
  • 作者简介:马忠政（1971-），男，博士，高级工程师，研究方向为轨道交通。

Field Static Uplift Tests of Grouted Steel Pipe Piles

MA Zhongzheng   

  1. (Shanghai Shentong Metro Group Co., Ltd., Shanghai 200042)
  • Received:2014-02-25 Online:2014-04-21 Published:2014-04-25

摘要： 依托上海某工程未注浆钢管桩和注浆钢管桩的抗拔承载力现场试验，分析了深厚软土层中钢管桩的静载~位移曲线，探讨了注浆对钢管桩承载力的提升效果，并通过有限元计算，定性分析了注浆泡对单桩承载力的影响。研究结果表明：注浆钢管桩荷载位移曲线呈“缓变型”，注浆对桩周土体的加固作用，可改善桩土接触面，增加桩身的粗糙度，在出浆口处，易于形成扩径，提高桩的锚固作用，因此，注浆工艺能显著提高钢管桩抗拔极限承载力，有效地减小抗拔桩位移，为软土地区基础的设计提供了有益参考。

关键词: 钢管桩, 注浆, 抗拔

Abstract: Field static uplift loading tests were performed on steel pipe piles with and without grouts in order to explore the effect of the grout on the uplift resistance and to obtain the static uplift loading test curves for piles in thick soft soils. The grouting zone on the axial uplift capacity of single piles was studied throughout the finite element analysis. The results indicate that the uplift loaddisplacement curve is "gradual change" type. The grout improves the surrounding soils as well as roughens the pilesoil interface. An increase of effective diameter can be found at the grouting holes and therefore, improves the uplift capacity of steel piles.

Key words: Steel Pipe Piles, Grout, Uplift Resistance