نوع مقاله : مقاله پژوهشی
نویسندگان
گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه قم، قم، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Soil contamination has been on the rise with the increasing demand for oil and its derivatives. Leakage of pollutants such as used motor oil into roadbeds and subgrade layers is considered a major challenge. Fine-grained cohesive soils, such as marl, are particularly more sensitive to moisture and hydrocarbon pollutants compared to other soil types. Despite numerous studies on the monotonic behavior of marl soils, less attention has been given to their cyclic and post-cyclic behavior. This study has evaluated the effect of used motor oil contamination on the cyclic and post-cyclic behavior of marl soil using a simple shear device. Marl soil samples were mixed with 0%, 4%, 8%, 12%, and 16% by weight of used motor oil and subjected to testing. The results indicated that an increase in the percentage of used motor oil up to 16% led to a 27% reduction in shear strength. Moreover, this contaminant reduced soil cohesion and internal friction angle by up to 47% and 6% before cyclic loading, and by 29% and 14% after it, respectively. However, the shear strength and cohesion improved after cyclic loading. Under cyclic loading, an increase in the oil content resulted in higher damping ratios and lower shear modulus values. Additionally, increasing the vertical stress led to an increase in shear modulus and a decrease in damping ratio. SEM analysis of the contaminated samples revealed reduced porosity and increased sample cohesion after cyclic loading compared to pre-loading conditions.
کلیدواژهها [English]
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