超长桩桩端注浆静载试验研究

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摘要桩端注浆主要用于提高桩端部承载力，桩端注浆对超长桩的作用机理尚需深入研究。采用静载荷试验对特大桥部分超长钻孔灌注桩的承载性能进行了研究。着重比较了桩端注浆前后，超长钻孔灌注桩承载性能的差异。根据试验数据对比发现，桩端注浆效果明显，注浆后桩极限承载力提高 10% 以上。试验结果表明桩端注浆明显提高桩下部侧摩阻力，且增强效果随着荷载增大变得明显。将现行规范的注浆后承载力计算增值与实测增值进行对比，发现规范计算结果均小于实测值，部分规范计算值过于保守。

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	黄挺
	龚维明
	李辉
	戴国亮

关键词 ：超长桩, 承载性能, 侧摩阻力 , 桩端后注浆, 现场试验

Abstract：The base post-grouting is used to improve the base resistance of piles, and the mechanism of base post-grouting in super-long piles needs to be a deep studied. In order to study the bearing capacity, static load tests are carried out on super-long bored piles employed in great bridges. The differences of the bearing capacity of super-long piled before and after base grouting are analyzed. Based on the test results, it is found that the bearing capacity of piles is increased by over 10 percent after base grouting. The frictional resistance at the lower part of piles increases significantly. As the load increases, the role of base grouting is more obvious. A comparative study between the field measured and calculated increments of the bearing capacity is made. The results indicate that the calculated increments of domestic standards are smaller than the field measured increments, and some calculated increments are over-conservative.

Key words： super-long pile bearing capacity friction resistance pile-base post-grouting field test

收稿日期: 2011-04-29

TU473.1

基金资助:江苏省自然科学基金项目(2008315)

作者简介: 黄挺 (1983 – ) ，男，浙江宁波人，博士研究生，主要从事地基基础等方面的研究。

引用本文:

黄挺, 龚维明, 李辉, 戴国亮. 超长桩桩端注浆静载试验研究[J]. 岩土工程学报, 2011, 33(zk1): 112-116. HUANG Ting, GONG Wei-ming, LI Hui, DAI Guo-liang. Static load tests on super-long piles with base post-grouting. Chinese J. Geot. Eng., 2011, 33(zk1): 112-116.

链接本文:

http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2011/V33/Izk1/112

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