(1. Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou,Zhejiang 310058,China;2. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Zhejiang University,Ministry of Education,Zhejiang University,Hangzhou,Zhejiang 310058,China;3. Underground mall Counstruction Co.,Ltd of Hangzhou Wulin Square. Hangzhou,Zhejiang 310058,China;4. Yunnan Jiaotong College,Kunming,Yunnan 650000,China)
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.
卡尔.塔萨奇,雷尔夫. 皮. 泼克著. 蒋彭年译.工程实用土力学[M]. 北京:水利水电出版社,1960.(TERZAGHIK,PECK R B. Translated by JIANG Pengnian. Soil mechanics in engineering practice[M]. Beijing:Water Resources and Hydro-power publisher,1960.(in Chinese))
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