无黏性土地区大直径超长钻孔灌注桩桩端压浆后的承载性能研究

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摘要根据现场试桩试验,分析研究了在无黏性土地区后压浆技术对大直径超长钻孔灌注桩承载力性状的影响。试验结果表明：大直径超长钻孔灌注桩桩端后压浆水泥浆液上返高度在该类地质条件下达 16.0 m 左右,压浆后极限承载力测试值是压浆前的 1.59 倍,压浆后端阻力是压浆前的 3.23 倍,压浆后桩侧阻力是压浆前的 1.23 倍。表明利用后压浆技术达到了节约工程投资、提高工程施工质量及可靠性的目的,并产生了较大的技术经济效益和良好的社会环境效益,该结论对相同地区同类基桩的设计、施工和深入研究具有一定的指导意义。

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	储诚富
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关键词 ：大直径超长桩, 桩端后压浆 , 无黏性土, 桩端阻力, 桩侧摩阻力

Abstract：According to the results of load tests on piles, the influence of pile tip post-grouting on the load bearing behavior of super-long large-diameter bored piles in cohesionless soil is analyzed. The test results show that the grouting cement can reach 16.0 m from the pile tip under the geological and construction conditions. The values of the ultimate bearing capacity, tip resistance and skin friction of the test piles after grouting are 1.59, 3.23 and 1.23 times those of bored piles without grouting. A conclusion is drawn that by using the tip post-grouting technique, it saves investment, improves construction quality and reliability, and brings considerable economic benefits and good socio-environment effects. Therefore it is instructive for the design and construction of similar piles.

Key words： super-long large-diameter pile pile tip post-grouting cohesionless soil pile tip resistance skin friction of pile

收稿日期: 2011-08-04

TU47

作者简介: 储诚富 (1975 – ) ,男,安徽潜山人,博士研究生,讲师,主要从事桩基工程、地基处理等方面的研究与教学工作。

引用本文:

储诚富, 李小春, 鹿立好, 席培胜. 无黏性土地区大直径超长钻孔灌注桩桩端压浆后的承载性能研究[J]. 岩土工程学报, 2011, 33(sup2): 388-391. CHU Cheng-fu, LI Xiao-chun, LU Li-hao, XI Pei-sheng. Load bearing behavior of pile tip post-grouting super-long large-diameter bored piles in cohesionless soil. Chinese J. Geot. Eng., 2011, 33(sup2): 388-391.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2011/V33/Isup2/388

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