| 桩端压浆对超长大直径桩侧阻力的影响研究 |
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| 引用本文： | 黄生根,龚维明.桩端压浆对超长大直径桩侧阻力的影响研究[J].岩土力学,2006,27(5):711-716. |
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| 作者姓名： | 黄生根 龚维明 |
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| 作者单位： | 1. 中国地质大学,工程学院,武汉,430074
2. 东南大学,土木工程学院,南京,210096 |
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| 摘 要： | 桩端压浆可大幅提高超长大直径桩侧阻力，且桩侧阻力的提高成为桩承载力提高的主要原因。桩土间存在一个软弱层（泥皮层），浆液在压力作用下总是沿着软弱面向上运动，并对桩侧土产生挤压，在使桩径扩大的同时，亦对桩周土体进行加固，从而使桩侧摩阻力提高。根据超长大直径桩工程实例的静载荷试验、标贯试验及CT检测结果证明，压浆后在桩端以上一定范围内桩周土强度提高，桩侧阻力提高12.39 %～52.87 %，侧阻力增量占总增量比例达56 %～88 %。
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| 关 键 词： | 桩端压浆 超长大直径桩 侧阻力 自平衡静载荷试验 |
| 文章编号： | 1000-7598-（2006）05-0711-06 |
| 收稿时间： | 2005-03-09 |
| 修稿时间： | 2005-06-08 |
Study on effect of base grouting on shaft friction of overlength large diameter pile |
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| HUANG Sheng-gen,GONG Wei-ming.Study on effect of base grouting on shaft friction of overlength large diameter pile[J].Rock and Soil Mechanics,2006,27(5):711-716. |
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| Authors: | HUANG Sheng-gen GONG Wei-ming |
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| Institution: | 1.Faculty of Engineering, China University of Geosciences, Wuhan 430074, China; 2. College of Civil Engineering, Southeast University, Nanjing 210096, China |
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| Abstract: | The shaft friction can be improved greatly by base grouting, and the increment is the major part of ultimate bearing capacity increment of the overlength large diameter pile. There is a weak layer between a pile and the soil around it, so the grout always flows upward along the weak layer, squeezing the soil to a larger diameter and improving the shaft friction. According to the results of the self-balanced static load testing method, the SPT test and the CT scanning test of a project with overlength large diameter piles, the strength of soils in a large range above pile- bases was improved and the shaft friction was increased 12.39 %-52.87 %, the ratios of shaft friction in the increment of ultimate bearing canacities was 56 %-88 %. |
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| Keywords: | base grouting overlength large diameter pile shaft friction the self-balanced static load testing method |
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