基于SEM图像的软土三维孔隙率计算及影响因素分析

doi:10.13722/j.cnki.jrme.2014.1302

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摘要为了获取丰富的SEM图像信息用于土体微观结构研究，对杭州紫金港软土进行了大量的SEM图像扫描。通过分析软土SEM图像的特点，建立了三维空间计算模型，首次提出利用Image-Pro Plus(IPP)软件计算软土三维孔隙率的方法，并分析了计算步距、放大倍数、阈值大小、分析区域大小等对软土三维孔隙率计算结果的影响。研究结果表明：计算精度跟步距大小有关，步距越小精度越高，采用步距2有利于兼顾计算容量和精度要求；对软土三维孔隙率放大倍数宜采用1 200±300倍；阈值取值跟放大倍数有关，放大倍数越大阈值也应相应增加；分析区域面积不宜太小，能有效反映整张图像信息的区域面积应占图像总面积的70%以上。

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关键词 ：微观结构, SEM图像, 阈值, 三维孔隙率

Abstract：In order to obtain a wealth of SEM image information for soil microstructure research，a larger number of SEM images for soft soil in Zijingang Hangzhou had been scanned. Three-dimensional calculation model was built by analyzing the characteristics of soft soil SEM image. First proposed the method of the use of Image-Pro Plus (IPP) to calculate soft soil three-dimensional porosity，the influences of calculated step size，magnification，threshold size and analysis area size on calculated results were studied. The results show that，calculation accuracy relates to step size，smaller step size is corresponding to a higher accuracy，and step size 2 can both satisfied the computing capacity and accuracy requirements. it is suitable to choose a magnification of 1200±300 times to calculate three-dimensional porosity. Threshold value size relates to magnification times，greater magnification should be increased threshold value accordingly. Area of analysis can not be too small，only by choosing over 70% of the total area of the image can effectively reflect the entire information of the image.

Key words： Microstructure；SEM image Threshold Three-dimensional porosity

引用本文:

徐日庆1，2，邓祎文1，徐波3，来剑平3，詹学贵4，徐丽阳1，陆建阳1. 基于SEM图像的软土三维孔隙率计算及影响因素分析[J]. 岩石力学与工程学报, 2015, 34(07): 22-22.
XU Riqing1，2，DENG Yiwen1，ZHAN Xuegui3，XU Liyang1，LU Jianyang1. SOFT SOIL THREE-DIMENSIONAL POROSITY CALCULATED BASE ON SEM IMAGE AND ITS INFLUENCE FACTORS ANALYSIS. , 2015, 34(07): 22-22.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.1302 或 http://www.rockmech.org/CN/Y2015/V34/I07/22

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