ABSTRACT

Soil contamination is one of the common and controversial environmental issues all over the world. Soil pollution through extraction, transfer, and petrochemical activities of petroleum products causes both environmental issues and geotechnical problems. Such pollution can reduce soil bearing capacity and can change soil permeability. In this paper, a series of geotechnical tests have been performed to investigate this problem, including direct shear test, permeability test, compaction test, X-ray diffraction, and Atterberg limits. Sandy soil samples were mixed with different percentages of crude oil and tested. The results from direct shear tests indicate a decrease in the internal friction angle of the samples due to increasing oil contamination level about 4 to 12 degrees. Also, the results show that oil contamination reduces cohesion in the clayey sand and increases cohesion in the other samples about 5 to 15 kPa. The effect of evaporation of some oil compounds on shear strength has been also tested on 16% contaminated samples and the results have been discussed. The results of permeability tests show that with the increase in the soil contamination up to 16%, the permeability coefficient of clayey sand samples increases about 50 times, while it does not vary too much for poorly-graded sand, well-graded sand, and silty sand.

摘要

土壤污染是全世界常见且有争议的环境问题之一。通过石油产品的提取，转移和石化活动造成的土壤污染既引起环境问题，也引起岩土工程问题。这种污染会降低土壤的承载力并改变土壤的渗透性。在本文中，已经进行了一系列岩土测试来研究该问题，包括直接剪切测试，渗透性测试，压实测试，X射线衍射和Atterberg极限。将沙质土壤样品与不同百分比的原油混合并进行测试。直接剪切试验的结果表明，由于油污染水平提高了约4至12度，样品的内摩擦角减小了。也，结果表明，油污染降低了黏性砂的内聚力，并增加了约5至15 kPa的其他样品的内聚力。还对16％受污染的样品测试了一些油类化合物的蒸发对剪切强度的影响，并对结果进行了讨论。渗透性测试的结果表明，随着土壤污染物的增加高达16％，粘土砂样品的渗透性系数增加了约50倍，而对于低级砂，高级砂和高等级砂的渗透率变化不大。粉砂。