柴油污染粉质黏土干裂隙的特征

发布时间：2018-06-25 07:32

本文选题：柴油 + 粉质黏土　；参考：《中南大学学报(自然科学版)》2017年05期

【摘要】：为了解油品渗漏污染问题对环境岩土工程实践的影响,以0号柴油污染为例,研究油污粉质黏土干裂隙的特征规律。首先将不同含油率(0,4%,8%,12%)的柴油污染粉质黏土泥浆放入玻璃器皿中进行自然晾干,然后采用Photoshop和ArcGIS等软件对不同含油率土样的干裂隙进行数字图像处理,获取裂隙平均宽度、裂隙长度、面裂隙率和分形维数等参数。最后分析不同含油率条件下粉质黏土干裂隙发育规律,探讨柴油对粉质黏土干裂隙形成与发展作用机理。研究结果表明:与未污染土相比,柴油污染土干裂隙发育较缓慢,且含油率越高,发育越慢;裂隙平均宽度和面裂隙率均随含油率增加而逐渐减小;柴油进入土中会抑制较长裂隙的发展,形成较短的干裂隙,裂隙的开裂程度随含油率增大而降低;干裂隙的分形维数随含油率的增加而减小,分形维数越小,裂隙越不发育;土颗粒间的油膜表面张力和柴油高分子油链作用使得粉质黏土的黏聚力增强,抗拉强度增大,干裂隙发育程度低。
[Abstract]:In order to understand the influence of oil leakage pollution on environmental geotechnical engineering practice, the characteristics of dry cracks in oil-contaminated silty clay were studied by taking No. 0 diesel oil pollution as an example. First, the silty clay mud with different oil content (0% and 8%) was put into the glassware for natural drying, and then the digital image processing of the dry crack of the soil samples with different oil content was carried out by using Photoshop and ArcGIS to obtain the average width of the crack. Fracture length, fracture rate and fractal dimension. Finally, the development of dry fissures of silty clay under different oil content is analyzed, and the mechanism of formation and development of dry fissures of silty clay by diesel oil is discussed. The results show that: compared with unpolluted soil, the dry crack of diesel contaminated soil develops slowly, and the higher the oil content, the slower the development, the average crack width and the surface fracture rate decrease with the increase of oil content. Diesel oil entering the soil will restrain the development of longer fractures and form shorter dry fractures, and the crack degree will decrease with the increase of oil content, and the fractal dimension of dry fractures will decrease with the increase of oil content, and the smaller the fractal dimension, the less the fracture will not develop. The surface tension of oil film between particles and the oil chain of diesel oil make the cohesion of silty clay increase, the tensile strength increases, and the degree of dry fissures is low.
【作者单位】：同济大学土木工程学院;东南大学交通学院;
【基金】：国家自然科学基金资助项目(41202192,41272311) 教育部留学回国人员科研启动基金资助项目(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)~~
【分类号】：TU442;X53

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