| 超长钻孔灌注桩桩端后压浆效果检测 |
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| 引用本文： | 戴国亮,龚维明,薛国亚,童小东.超长钻孔灌注桩桩端后压浆效果检测[J].岩土力学,2006,27(5):849-0852. |
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| 作者姓名： | 戴国亮 龚维明 薛国亚 童小东 |
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| 作者单位： | 东南大学,土木工程学院,南京,210096 |
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| 摘 要： | 主要介绍一根超长钻孔灌注桩桩端后压浆试验成果，包含自平衡静载试验以及钻孔取芯试验。结果表明，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约达15 m左右，但水泥浆液在地下需要较长时间才能达到设计强度，且分布不均。桩周土层标贯试验表明，贯入击数与压浆前相比，普遍提高。自平衡静载荷试验结果表明，压浆后承载力增加50 %。因此桩端后压浆对提高桩承载力和改善荷载传递性能有明显的效果。
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| 关 键 词： | 超长桩 后压浆 承载力 自平衡法 |
| 文章编号： | 1000-7598-（2006）05-0849-04 |
| 收稿时间： | 2004-07-08 |
| 修稿时间： | 2005-01-04 |
Effect examination for a base post-grouted overlength drilling pile |
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| DAI Guo-liang,GONG Wei-ming,XUE Guo-ya,TONG Xiao-dong.Effect examination for a base post-grouted overlength drilling pile[J].Rock and Soil Mechanics,2006,27(5):849-0852. |
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| Authors: | DAI Guo-liang GONG Wei-ming XUE Guo-ya TONG Xiao-dong |
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| Institution: | College of Civil Engineering, Southeast University, Nanjing 210096, China |
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| Abstract: | This paper mainly introduces the test results of an overlength drilling pile with base post grouting technique,including self-balanced loading test and coring test.According to tests,the grouting cement can rise up to 15 m from pile tip under the geological and construction conditions,but requires much time to reach its design strength and distributes non-uniformly around pile tip.The standard penetration tests(SPT) show the number of SPT after grouting is more than that of before grouting.The self-balanced test results indicate that the bearing capacity of the test pile after grouting is 1.5 times of that of before grouting.Compared with non-grouted piles,the base post-grouted piles obviously improve the bearing capacity and load transfer behavior. |
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| Keywords: | overlength pile post-grouting pile bearing capacity self-balanced test |
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