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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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

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.1302 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/I7/22

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