بررسی تأثیر آلودگی ناشی از گازوئیل در رفتار خاک مارن (مطالعه‌ی موردی شهر قم)

نوع مقاله : یادداشت فنی

نویسندگان

گروه مهندسی عمران، دانشکده‌ی فنی و مهندسی، دانشگاه قم، قم، ایران.

10.24200/j30.2025.65025.3361

چکیده

در مطالعه‌ی حاضر، تأثیر میزان و مدت آلودگی ناشی از گازوئیل در پارامترهای مقاومتی و تحکیمی خاک مارن قم با استفاده از آزمایش‌های تک­محوری و تحکیم و همچنین با استفاده از تصاویر میکروسکوپ الکترونی بررسی شده است. نتایج نشان داده که مقاومت فشاری محصورنشده‌ی نمونه­‌ی مارن با افزایش آلودگی تا 3٪ وزنی، حدود 68٪ افزایش و سپس کاهش می یاید. این در حالی است که افزایش زمان آلودگی همواره موجب کاهش مقاومت فشاری نمونه­های آلوده می­شود. از سوی دیگر، مشخص شده  که آلودگی منجر به افزایش شاخص­ فشردگی و تورم در خاک مارن می‌شود و ضریب تحکیم نیز از یک روند کاهشی ضمن افزایش میزان آلاینده تبعیت می­کند. همچنین، نتایج تصاویر میکروسکوپ الکترونی حاکی از کاهش حفره‌ها و افزایش پیوستگی نمونه­ی آنی نسبت به نمونه­ی 7 روزه‌ی آلوده به گازوئیل است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the Effect of Diesel Pollution on Marl Parameters-A Case Study in Qom City

نویسندگان [English]

  • Morteza Namati
  • Majid Yazdandoust
  • Mahdi khodaparast
Faculty of Civil Engineering, Faculty of Engineering, University of Qom, Qom, Iran.
چکیده [English]

Considering population growth, industrialization, and pollutant sources, soil contamination by hydrocarbons is one of the most significant risks to humans. Besides its adverse environmental effects, soil pollution also alters the geotechnical properties of soils. Soils around refineries, fuel stations, and oil and gas pipelines, especially in oil-rich countries like Iran, are constantly exposed to contamination due to the extensive transportation of hydrocarbons. Given the prevalence of marl soil in Iran, particularly in Qom city, studying the properties of contaminated soil is crucial for various engineering purposes. Despite various methods for bioremediation of contaminated soil, these methods have limitations. Therefore, a detailed study of the geotechnical behavior of hydrocarbon-contaminated soil and its potential use for civil and economic projects is essential. In this study, we investigated the impact of diesel pollution on the strength and consolidation parameters of Qom’s marl soil using uniaxial and consolidation tests, along with electron microscope images. For this purpose, marl soil samples were prepared with 0%, 3%, 6%, and 9% diesel contamination by weight and tested at different time intervals (0, 7, 14, and 28 days). The results of the uniaxial compressive strength test indicate that the marl sample increases by approximately 68% with 3% pollutant content, but with further pollutant increase, the compressive strength decreases. The effect of time also manifests as a reduction in strength for contaminated samples. On the other hand, consolidation test results show that pollution leads to an increase in the compression index and swelling in marl soil. The coefficient of consolidation also follows a decreasing trend with increasing pollutant content. Additionally, electron microscope images reveal reduced porosity and increased cohesion in the contaminated sample compared to the 7-day diesel-polluted sample. Moreover, a linear relationship with a correlation coefficient of 0.73 was obtained between the compressive strength and the secant modules.

کلیدواژه‌ها [English]

  • Marl soil
  • gas oil contamination
  • shear strength
  • consolidation
  • electron microscopy

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