| 砂土颗粒形状量化及其对力学指标的影响分析 |
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| 引用本文： | 刘清秉,项伟,M.Budhu,崔德山.砂土颗粒形状量化及其对力学指标的影响分析[J].岩土力学,2011,32(Z1):190-197. |
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| 作者姓名： | 刘清秉 项伟 M.Budhu 崔德山 |
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| 作者单位： | 1.中国地质大学 工程学院，武汉 430074；2. Department of Civil Engineering and Engineering Mechanics, University of Arizona, Tucson, 85721, USA |
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| 基金项目： | 国家自然科学基金(No.40972185);国家青年科学基金项目资助(No.41002102) |
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| 摘 要： | 砂作为一种特殊的散体材料，其宏观物理力学性质，如密实度、剪切特性（临界状态角，剪胀角）、压缩性及颗粒破碎特征等均受到颗粒形状的影响，目前为止，对于砂粒土颗粒形状的量化工作，未到达成熟阶段。试验采用普通光学显微镜获取3种不同砂颗粒及一种相似材料（玻璃球）数字图像，利用ImageJ图形软件对其进行黑白二值化处理，获取颗粒形状轮廓边界；从3个层次定义颗粒形状参数，并利用java语言编制形状量化插件程序，计算砂粒各形状参数值，最后通过相对密度试验、直剪试验测试不同砂样的极限孔隙比、剪切强度指标。试验结果表明：整体轮廓系数、球形度、棱角度3项形状参数可作为不同砂粒形状鉴别和量化的关键参数，且与剪胀角、临界状态摩擦角均具有良好的相关性，试验提供了一种量化砂颗粒形状的有效方法，并可将得到的关键量化参数应用到宏观力学性质分析与数值模拟工作中
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| 关 键 词： | 砂粒 颗粒形状 数字图像处理 形状参数 剪胀角 |
| 收稿时间： | 2010-10-18 |
Study of particle shape quantification and effect on mechanical property of sand |
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| LIU Qing-bing,XIANG Wei,M.Budhu,CUI De-shan.Study of particle shape quantification and effect on mechanical property of sand[J].Rock and Soil Mechanics,2011,32(Z1):190-197. |
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| Authors: | LIU Qing-bing XIANG Wei MBudhu CUI De-shan |
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| Institution: | 1. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China; 2. Department of Civil Engineering and Engineering Mechanics, University of Arizona, Tucson 85721, USA |
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| Abstract: | As a special granular material, the mechanical properties and characteristics of sand are significantly affected by particle shape such as packing density, shearing characterization, compaction, and crushability. However, grain shape quantification techniques to distinguish one sandy material from another have not reached a stage of development for inclusion in the interpretation of the behavior of sand. In this paper, the light microscope was employed to capture the grain shape digital images, which were subsequently converted into binary picture to produce contour boundary for particle shape with the help of ImageJ. The Java program language was used to compile a new plugin to determine several grain shape parameters of all sand samples in our test. Finally, relative density and direct shear tests were conducted to determine the limit void ratios and shearing strength index. It is concluded that the overall outline coefficient, sphericity, angularity could be taken as the key shape parameters to distinguish grains; and these key parameters are related closely with the angle of dilation and critical state angle as well. The proposed method can be used as an effective means to accomplish the sand particle shape quantification; and the key shape parameters can also be applied to the mechanical properties analysis and the related numerical simulation work |
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| Keywords: | sand particle shape digital image processing shape parameters dilation angle |
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