基于SEM图片的钙质砂连通孔隙分析

蒋明镜; 吴迪; 曹培; 丁志军

doi:10.11779/CJGE2017S1001

基于SEM图片的钙质砂连通孔隙分析 English Version

蒋明镜^1,2,
吴迪^1,2,
曹培^1,2,
丁志军³

1. 同济大学岩土及地下工程教育部重点实验室,上海 200092;
2. 同济大学地下建筑与工程系,上海 200092;
3. 上海理工大学土木工程系,上海 200093

基金项目: 国家自然科学基金项目（51579178）

详细信息

作者简介:
蒋明镜（1965-）,男,教授,博士生导师,主要从事天然结构性黏土、砂土、太空土、深海能源土、非饱和土的宏、微观之试验、本构模型和数值分析方面的研究以及土体逐渐破坏分析。E-mail:mingjingjiang@tongji.edu.cn。

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出版历程
- 收稿日期: 2016-11-27
- 发布日期: 2017-11-19

Connected inner pore analysis of calcareous sands using SEM

1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;
2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;
3. Department of Civil Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

摘要

摘要: 钙质砂是一种以碳酸钙为主要成分的特殊砂土,由于在形成过程中保留了原生物的骨架,故钙质砂颗粒不仅形状各异而且富含孔隙。颗粒孔隙的存在对钙质砂的压缩、剪切、强度和破碎性等力学性质有很大影响。针对这一问题,取南海一处岛礁建设地基的钙质砂试样,根据粒径大小将其分为6个不同的粒组,在每个粒组中选出不同形状的代表性颗粒,对其进行电镜扫描试验。借助MATLAB图像处理程序,选取合适的阈值对扫描试验得到的图片进行二值化处理,对钙质砂的连通孔隙进行了分析,系统的研究了不同粒径和粒形钙质砂颗粒的表观孔隙率的分布规律。结果表明：对于粒径小于1 mm的颗粒,面孔隙度随着粒径的增大而增大,不同形状颗粒面孔隙度差别不大;粒径超过1 mm后,面孔隙度随着粒径的增大而减小;条状颗粒面孔隙度最大而片状颗粒的面孔隙度最小。
- 电镜扫描试验 /
- 钙质砂 /
- 二值化图像 /
- 颗粒内孔隙
Abstract: Calcareous sand is a special kind of geotechnical sand which consists of much carbonate. Based on the remains of the original marine organisms, the calcareous sand grains have irregular shapes and contain inner pores. The inner pore structure has great effect on the mechanical properties of the calcareous sand. To investigate the distribution of inner pores, the calcareous sand samples from the South China Sea are divided into six groups according to grain size, and a series of scanning electron microscopy (SEM) tests are carried out on different shape grains from each group. MATLAB is used to process the images got from the SEM tests with proper threshold values. The effects of grain size and grain shape on inner pores of calcareous sands are analyzed. The results reveal that, for the sand grains with size less than 1 mm, the porosity increases with the growth of grain size and there is no obvious difference between the porosity of grains with different shapes. However, for the sand grains with size greater than 1 mm, the porosity decreases with the growth of grain size and the strip shape grains have the largest porosity while the slice shape grains have the smallest one.
- scanning electron microscope /
- calcareous sand /
- binary image /
- inner pore

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参考文献(10)

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