摘要
为获取丰富的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大量的SEM图像扫描。通过分析软土SEM图像的特点,建立三维空间计算模型,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。
A larger number of SEM images were obtained after scanning the soft soil from Zijingang in Hangzhou in order to investigate the microstructure of the soil. A three-dimensional model was established based on the characteristics of the SEM images of soft soil. Image-Pro Plus(IPP) was used to calculate the three-dimensional porosity of the soft soil. The influences of the step size,the magnification,the threshold size and the size of analyzed area on the calculated results were studied. The smaller step size was found to corresponding to a higher accuracy,and the step size 2 satisfied both the computing capacity and accuracy requirements. It was suitable to choose a magnification of 1 200±300 times to calculate the three-dimensional porosity. The threshold value was related to the magnification. The greater magnification should be matched with larger threshold value accordingly. Area of analysis over 70% of the total area of the image reflected effectively the entire information of the image.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2015年第7期1497-1502,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51178420)
国家科技支撑计划项目(2012BAJ01B04–3)
关键词
土力学
微观结构
SEM图像
阈值
三维孔隙率
soil mechanics
microstructure
SEM image
threshold
three-dimensional porosity
