| 颗粒图像测速技术在桩基负摩阻力模型试验中的运用 |
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| 引用本文： | 黄 挺,戴国亮,龚维明,郑金海,徐国平.颗粒图像测速技术在桩基负摩阻力模型试验中的运用[J].岩土力学,2013,34(Z1):162-166. |
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| 作者姓名： | 黄 挺 戴国亮 龚维明 郑金海 徐国平 |
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| 作者单位： | 1. 河海大学 港口海岸与近海工程学院, 南京 210098；2. 东南大学 土木工程学院, 南京 210096； 3. 中交公路规划设计院有限公司, 北京 100010 |
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| 基金项目： | 国家科技支撑计划项目资助（No.2011BAG07B01）；中央高校基本科研业务费专项基金资助（No.2013B03214）。 |
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| 摘 要： | 在桩基负摩阻力的研究中桩土位移需重点关注。作为一种成熟的流场测试手段，颗粒图像测速(paticle image velocimetry, PIV)技术已逐步推广至岩土研究领域，将该技术运用至桩基负摩阻力模型试验，可以弥补传统位移测试方法无法获得位移场分布等缺点。基于试验特点，设计由钢板和有机玻璃壁组成的试验箱，采用千斤顶配合置于土表的载荷板实现对土体加载。试验中，对不同土表超载作用下的土体分层沉降、桩身沉降及轴力进行测定，采用PIV技术对桩端处砂土的位移场实施了采样分析。试验表明，PIV所测位移数值与传统方法测得值吻合较好，PIV分析结果能够直观反映桩基受负摩阻力作用而产生的附加沉降；并且可以判断桩端沉降的影响范围，深度方向基本不超过1.75D（D为直径），水平方向则基本在桩底边界范围内。最后，总结了PIV技术在模型试验中的运用，提出了几点在今后试验中可待改进的地方。
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| 关 键 词： | 颗粒图像测速 桩 负摩阻力 模型试验 中性点 轴力 位移 |
| 收稿时间： | 2013-01-06 |
Application of particle image velocimetry to model test of negative skin friction on pile |
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| HUANG Ting,DAI Guo-liang,GONG Wei-ming,ZHENG Jin-hai,XU Guo-ping.Application of particle image velocimetry to model test of negative skin friction on pile[J].Rock and Soil Mechanics,2013,34(Z1):162-166. |
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| Authors: | HUANG Ting DAI Guo-liang GONG Wei-ming ZHENG Jin-hai XU Guo-ping |
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| Institution: | 1. College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China; 2. School of Civil Engineering, Southeast University, Nanjing 210096, China; 3. CCCC Highway Consultants Co., Ltd., Beijing 100088, China |
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| Abstract: | In the research on negative skin friction on pile, the pile-soil displacement is the key point concerned. As a mature flow test technique, the particle image velocimetry(PIV) is gradually used in the field of geotechnical tests. By applying PIV technology in the model test of negative skin friction on pile, some defects of traditional displacement measuring technique, such as cannot obtain displacement field, will be improved. Aiming at the characteristics of test, a testing box was designed which included steel plates and organic glass plate. The soil surface load was simulated by jack and load board. Settlement of each soil layer, settlement of pile and axial force were measured in the test; and the displacement field around the pile base was measured by PIV technology under various stages of heaped loads. The test results show that the settlement measured by PIV technology is consistent with the settlement measured by traditional technology. The results of PIV analysis can intuitively reflect the additional settlement caused by the negative skin friction on pile. In addition, influence scope of soil displacement caused by the settlement of pile is analyzed. The analysis results show that the vertical influence scope is about 1.75D (Disdiameter) and the horizontal influence scope is no more than 1 D. At last, a summary is made about the application of PIV technology to this model test, and some issues for future study are put forward. |
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| Keywords: | particle image velocimetry(PIV) pile negative skin friction model test neutral point axial force displacement |
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