Oil and its derivatives such as gasoline, gasoil and ‎kerosene are the main sources of energy in the transport and industry sectors, and also the most common ‎soil contaminants. Oil contamination of the soils as a serious geoenvironmental problem not only affects soil quality ‎but also changes its geotechnical properties. Any changes in the geotechnical properties of the soils affect the axial bearing capacity of pile. The main objective of the current study is to determine the effects of various concentrations of different oil ‎products, as well as different soil relative densities, and thickness of the contaminated sand layer on the load–displacement (axial compressive) behaviour of two ‎instrumented, close-ended steel pipe piles with different diameters and slenderness ratios implemented in an oil-contaminated sandy soil through physical modelling. Tests results were compared with the CFEM ‎analytical method of calculating pile axial bearing capacities. Results showed that increasing the percentage of the oil in the soil reduces the values of net total, toe and shaft bearing ‎capacity of the pile. The type of the oil had a remarkable effect on the bearing capacities of the pile. The higher the kinematic ‎viscosity, the lower the amount of bearing capacities. ‎Comparing the measured and predicted values of bearing capacity based on modified CFEM ‎method concluded that, although a good agreement can be seen between the results of shaft capacity, the ‎CFEM method with modified bearing capacity factors could not predict the effects of oil contamination ‎on the toe bearing capacities of piles precisely.

中文翻译：

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含油砂土中仪表桩轴向抗压承载力物理建模

石油及其衍生物，如汽油、瓦斯油和煤油，是运输和工业部门的主要能源来源，也是最常见的土壤污染物。土壤油污作为严重的地质环境问题不仅会影响土壤质量，还会改变其岩土特性。土壤岩土特性的任何变化都会影响桩的轴向承载力。当前研究的主要目的是确定不同油品的不同浓度、不同土壤相对密度和污染砂层厚度对两种仪器的载荷-位移（轴向压缩）行为的影响。 , 通过物理建模在含油沙土中实施不同直径和长细比的封闭式钢管桩。测试结果与计算桩轴向承载力的 CFEM 分析方法进行了比较。结果表明，增加土壤中油的百分比会降低桩的净总承载力、桩尖承载力和轴承载力的值。油的类型对桩的承载能力有显着影响。运动粘度越高，承载能力越低。比较基于改进的 CFEM 方法的承载能力的测量值和预测值，得出的结论是，尽管轴承载力的结果之间存在良好的一致性，