| 砂土中抗拔桩与抗压桩模型试验研究 |
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| 引用本文： | 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].岩土力学,2011,32(3):738-744. |
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| 作者姓名： | 陈小强 赵春风 甘爱明 |
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| 作者单位： | 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 |
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| 基金项目： | 国家自然科学基金项目，上海市重点学科建设项目资助，上海城建(集团)公司资助项目 |
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| 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。
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| 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 |
| 收稿时间： | 2009-08-24 |
Study of model test of uplift and compression piles in sand |
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| CHEN Xiao-qiang,ZHAO Chun-feng,GAN Ai-ming.Study of model test of uplift and compression piles in sand[J].Rock and Soil Mechanics,2011,32(3):738-744. |
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| Authors: | CHEN Xiao-qiang ZHAO Chun-feng GAN Ai-ming |
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| Institution: | 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 |
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| 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 com... |
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| Keywords: | sand model test uplift pile compression pile carrying capacity axial force lateral friction |
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