| 钙质砂中单桩轴向抗拔模型试验研究 |
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| 引用本文： | 陈杨,杨敏,魏厚振,李卫超,孟庆山.钙质砂中单桩轴向抗拔模型试验研究[J].岩土力学,2018,39(8):2851-2857. |
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| 作者姓名： | 陈杨 杨敏 魏厚振 李卫超 孟庆山 |
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| 作者单位： | 1. 同济大学 土木工程学院 地下建筑与工程系，上海 200092； 2. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，湖北 武汉 430071 |
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| 基金项目： | 国家自然科学基金项目（No. 41502273, No. 41372316, No. 41372274）；同济大学优秀青年基金项目（No. 2015KJ009）；中国科学院青年创新促进会资助（No. 2015272）。 |
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| 摘 要： | 针对取自南沙群岛的钙质砂，通过室内模型试验对钙质砂中单桩轴向抗拔承载特性进行研究，讨论了地基相对密实度与桩基埋深对于其抗拔承载力的影响特征。结果表明，在一定范围内，增大地基相对密实度和埋深均能显著提高桩基的承载能力；降低相对密实度或埋深不仅会降低其承载能力，也会增加其在同级荷载下产生的变形；模型桩的桩身轴力从桩顶随深度增加而逐渐降低至0；相对密实度的增加不仅能提高极限桩侧摩阻力的大小，还会在一定程度上影响桩侧摩阻力的分布形式；0.1倍的桩径可以看作是模型桩出土破坏的临界位移量。
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| 关 键 词： | 钙质砂 单桩 轴向拉拔 模型试验 |
| 收稿时间： | 2018-04-08 |
Experimental study on axial tension response of model monopile in calcareous sand |
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| CHEN Yang,YANG Min,WEI Hou-zhen,LI Wei-chao,MENG Qing-shan.Experimental study on axial tension response of model monopile in calcareous sand[J].Rock and Soil Mechanics,2018,39(8):2851-2857. |
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| Authors: | CHEN Yang YANG Min WEI Hou-zhen LI Wei-chao MENG Qing-shan |
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| Institution: | 1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China |
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| Abstract: | Series of model tests are performed in calcareous sand retrieved from the Nansha Islands to investigate the axial tension response of monopile. The effects of the relative density of the ground soil and the embedment length of the monopile on the tension response of monopile are studied in detail. The results show that, the pull-out capacity of the model monopile is improved, as expected, by increasing the relative density of the ground soil and the embedment length of the model monopile. Reducing the relative density or embedment length not only reduces its pull-out capacity, but also increases its displacement under a same tension load as on a pile with a larger embedded depth or in a denser ground. As the depth increases, the axial force developed in the model monopile decreases gradually from the maximum value at the top of monopile to zero at the monopile tip. The increase of relative density affects both the magnitude and the distribution of the ultimate frictional resistance between the model monopile and around soil. 0.1 times the diameter of the monopile can be regarded as the critical displacement for the failure of the tension monopile. |
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| Keywords: | calcareous sand monopile axial tension model test |
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