| 软土地区超长抗拔桩成桩选型研究 |
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| 引用本文： | 安景波,赵思远,邓志辉.软土地区超长抗拔桩成桩选型研究[J].岩土工程技术,2009,23(6):284-287. |
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| 作者姓名： | 安景波 赵思远 邓志辉 |
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| 作者单位： | 1. 上海市民防地基勘察院,上海,200232;深部岩土力学与地下工程国家重点实验室,江苏徐州,221008
2. 上海市民防地基勘察院,上海,200232 |
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| 摘 要： | 对软土地区长抗拔桩中常用的常规直桩、扩底桩、注浆直桩的承载力性状进行了比较分析，研究了不同桩型的荷载传递规律和承载力提高机理，并引出其荷载一位移的理论计算公式，认为抗拔桩存在“有效桩长”。通过对某沿海城市不同超长抗拔桩的现场抗拔试验，分析比较了各种桩型在30mm上拔位移控制值下的单桩承载力和桩侧摩阻力分布规律，认为超过“有效桩长”的设计是不经济的，注浆直桩可以提高安全系数，宜优先选用注浆直桩。
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| 关 键 词： | 抗拔桩 常规直桩 扩底桩 注浆直桩 “有效桩长” |
Study of Choice Behavior on the Super-long Uplift Piles in Mollisol Area |
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| An Jingbo,Zhao Siyuan,Deng Zhihui.Study of Choice Behavior on the Super-long Uplift Piles in Mollisol Area[J].Geotechnical Engineering Technique,2009,23(6):284-287. |
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| Authors: | An Jingbo Zhao Siyuan Deng Zhihui |
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| Institution: | An Jingbo Zhao Siyuan Deng Zhihui (1. Shanghai Foundation Surveying Institute of the Civil Defenee,Shanghai 200232,China; 2. State Key Laboratory for Geomechanics ＆ Deep Undergound Engineering,Xuzhou 221008, Jiangsu,China) |
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| Abstract: | The long uplift piles are researched in this paper through the comparative analysis of conventional straight piles, grouting piles and under-reamed piles. The theoretical equation of load-displacement is derived by a mathematical model. The mechanism of increasing load-carrying capacity and load transfer law of the different piles are studied by analysising the load-carrying capacity when the displacement of the pile top is 30 mm, and the distribution of frictional resistances of different style of piles in a mollisol area of coastal. The grouting straight piles should be the priority selection because of the increase of safety probability. |
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| Keywords: | uplift pile conventional pile enlarged base pile post grouting pile critical length of pile |
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