中南大学学报（自然科学版）2017，Vol.48Issue(5)：1335-1343,9.DOI:10.11817/j.issn.1672-7207.2017.05.028
柴油污染粉质黏土干裂隙的特征
Characteristics of air-dried cracks of silty clay contaminated by diesel oil
摘要
Abstract
In order to figure out the effect of oil seepage pollution on environmental geotechnical engineering practice, the influence of No.0 diesel on air-dried cracks of clay soil was studied in the investigation. Firstly, laboratory tests were conducted to simulate the air-dried process of soil contaminated by diesel oil at different oil contents (0, 4%, 8% and 12%). Then, digital images of soil cracks were processed with softwares such as Photoshop and ArcGIS to obtain fractal dimension and common morphological parameters (e.g. average crack width, crack length and surface crack rate). Finally, the development trend of the cracks for different oil contents was analyzed and the mechanism of diesel oil acting on the fracture's formation and development was discussed. The results show that crack development of oil-contaminated soil is similar to that of unpolluted soil. While diesel oil content increases, the development process of the cracks becomes slow. Moreover, both average crack width and surface crack rate decrease gradually with the increase of oil content. The presence of oil can hinder the formation of long cracks from running though the soil body and consequently promote the development of shorter fissures. Fractal dimension decreases with the increase of oil content, which means that fracture development is not good for the soil contaminated by diesel oil. Surface tension of oil film between soil particles and the polymer oil chains of diesel oil increases the cohesion and tensile strength of soil, and as a result, it makes cracks not easy to develop.关键词
柴油/粉质黏土/裂隙/图像处理/GISKey words
diesel oil/silty clay/crack/picture processing/GIS分类
建筑与水利引用本文复制引用
倪可,蔡奕,魏乾坤,刘志彬..柴油污染粉质黏土干裂隙的特征[J].中南大学学报（自然科学版）,2017,48(5):1335-1343,9.基金项目
国家自然科学基金资助项目(41202192,41272311) （41202192,41272311）
教育部留学回国人员科研启动基金资助项目(2013-1792) （2013-1792）
同济大学中央高校基本科研业务费专项资金资助项目(20132055) (Projects(41202192, 41272311) supported by the Natural National Science Foundation of China （20132055）
Project (2013-1792) sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education （2013-1792）
Project(20132055) supported by Fundamental Research Funds for the Central Universities) （20132055）
