软土地区超长抗拔桩成桩选型研究
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-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。
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.
中文标题：
软土地区超长抗拔桩成桩选型研究
Study of Choice Behavior on the Super-long Uplift Piles in Mollisol Area
作者：
安景波1,2,赵思远1,邓志辉1
An Jingbo1,2,Zhao Siyuan1,Deng Zhihui1
作者简介:安景波,1982年生,男,四川阆中人.硕士研究生,研究方向:桩基T程。E-mail:anjingbo02020348@163.com
通讯地址：
1. 上海市民防地基勘察院, 上海 200232; 2. 深部岩土力学与地下工程国家重点实验室, 江苏徐州 221008
1.ShanghaiFoundationSurveyingInstituteoftheCivilDefence,Shanghai200232,China; 2.StateKeyLaboratoryforGeomechanics&DeepUndergoundEngineering,Xuzhou221008,Jiangsu,China
中图分类号:TU19
doi:10.3969/j.issn.1007-2993.2009.06.004
出版物：岩土工程技术
收稿日期:2009-07-22
关键词:抗拔桩,常规直桩,扩底桩,注浆直桩,“有效桩长”
Key words:uplift pile,conventional pile,enlarged base pile,post grouting pile,critical length of pile
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