砂土中抗拔桩与抗压桩模型试验研究

›› 2011, Vol. 32 ›› Issue (3): 738-744.

砂土中抗拔桩与抗压桩模型试验研究

陈小强^1,2，赵春风^1,2，甘爱明^1,2

1.同济大学岩土及地下工程教育部重点实验室，上海 200092；2.同济大学地下建筑与工程系，上海 200092

收稿日期:2009-08-24 出版日期:2011-03-10 发布日期:2011-03-21
作者简介:陈小强，男，1984年生，硕士研究生，主要从事桩基工程方面研究。
基金资助:
国家自然科学基金项目（No. 40972180）；上海市重点学科建设项目资助（No. B308）；上海城建（集团）公司资助项目。

Study of model test of uplift and compression piles in sand

CHEN Xiao-qiang ^{1, 2}, ZHAO Chun-feng^{1, 2}, GAN Ai-ming^{1, 2}

1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China

Received:2009-08-24 Online:2011-03-10 Published:2011-03-21

摘要/Abstract

摘要：

为研究单桩在抗拔与抗压条件下承载能力、桩身轴力以及侧摩阻力分布规律的不同，进行了砂土中长径比大于40的抗拔桩与抗压桩室内模型试验，通过桩身内设置电阻应变片，测得各级荷载下桩身不同深度的应变。分析表明，抗拔桩不论是位移还是位移增长速率，都远远超过抗压桩。因此，抗拔桩设计时应综合考虑桩顶上拔量来确定抗拔承载力。抗拔桩与抗压桩的桩身轴力分布具有相似的特性，试验所得抗拔总侧摩阻力折减系数?=0.56。抗拔桩与抗压桩侧摩阻力都是从上部开始发挥并向下传递，随着荷载的增加，上部侧摩阻力变化很小，桩身中下部侧摩阻力迅速增长。抗拔桩桩端部侧摩阻力表现出弱化效应，抗压桩则表现出强化效应。

关键词: 砂土, 模型试验, 抗拔桩, 抗压桩, 承载能力, 轴力, 侧摩阻力

Abstract:

Indoor model tests in which the slenderness ratio of uplift piles and compression piles were above 40 were carried out to research the distribution differences of carrying capacity, axial force and lateral friction when a single pile is under the situation of uplifting and compression. Through setting resistance strain gage in the piles, strain of the piles in different depth under each load level was gotten. Through the analysis, the displacement and its rising rate of uplift piles are far more than that of compression piles. As a result, the displacement of pile block should be taken into consideration to determine the uplift capacity in the process of design. The axial force distribution of uplift pile is similar to that of compression pile; the reduction factor of uplift piles' total lateral friction is λ=0.56 according to the test. The lateral friction of both uplift and compression piles first functions on the top and transfers from the top down. With the increase of load, the lateral friction on the upside rarely changes while the lower part grows rapidly. The tip of the uplift pile shows the weakening effect and the compression pile shows the strengthening effect.

Key words: sand, model test, uplift pile, compression pile, carrying capacity, axial force, lateral friction

中图分类号:

TU473

陈小强，赵春风，甘爱明. 砂土中抗拔桩与抗压桩模型试验研究[J]. , 2011, 32(3): 738-744.

CHEN Xiao-qiang, ZHAO Chun-feng, GAN Ai-ming. Study of model test of uplift and compression piles in sand[J]. , 2011, 32(3): 738-744.

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