تأثیر آلودگی نفتی بر ظرفیت باربری پی نواری مستقر بر ماسه مسلح با ژئوسل تحت بار خارج از مرکز

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی عمران، واحد تهران جنوب، دانشگاه آزاد اسلامی، تهران، ایران

2 دانشکده مهندسی عمران، دانشگاه آزاد اسلامی واحد تهران جنوب، تهران، ایران

3 دانشکده مهندسی عمران، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران

چکیده

نفوذ نفت خام و مشتقات آن به خاک علاوه بر مشکلات مخرب و زیان آور زیست محیطی، منجر به تغییراتی در رفتار مکانیکی خاک می شود. هدف این مطالعه ارزیابی ظرفیت باربری پی های نواری مستقر بر ماسه‌ی آلوده به نفت مسلح با ژئوسل تحت بار خارج از مرکز از طریق مدل‌سازی عددی با استفاده از PLAXIS 2D است. رفتار پی بر اساس محتوای مختلف نفت با مقادیر 0، 3، 6، 9 و 12 درصد تحت بارگذاری با خروج از مرکزیت های مختلف e/B=0, 1/12, 1/6, 1/3 مورد ارزیابی قرار گرفته است. نتایج عددی نشان داد که آلودگی خاک بر عملکرد پی های نواری اثر منفی دارد، به طوری که افزایش محتوای نفت منجر به کاهش ظرفیت باربری پی می شود. مشاهده شد که تقویت خاک بستر با ژئوسل موجب افزایش ظرفیت باربری پی مستقر بر محیط آلوده به نفت به ازای مقادیر مختلف خروج از مرکزیت می شود. اثر تقویت با ژئوسل برای خاک آلوده بیشتر از خاک تمیز بود. علاوه بر این، با افزایش محتوای نفت و افزایش نشست، ضریب بهبود ظرفیت باربری (IF) افزایش یافت. همچنین، مشاهده شد که اثر تقویت کننده با افزایش خروج از مرکزیت بار برای هر دو خاک تمیز و آلوده افزایش می یابد. علاوه بر این، استفاده از ژئوسل‌ها زمانی موثرتر بود که بارگذاری خارج از هسته فونداسیون باشد، یعنی e/B>1/6. همچنین، کج شدن پی حول محور خط مرکزی آن به دلیل خروج از مرکزیت بار و همچنین تقویت خاک با ژئوسل منجر به کاهش ناحیه متاثر از تنش و در نتیجه عمق جابجایی خاک در زیر پی شد.

کلیدواژه‌ها

عنوان مقاله [English]

Oil-contamination impact on bearing capacity of strip footing placed on geocell-reinforced sand under eccentric load

نویسندگان [English]

  • Mohammad Samed Jahanian 1
  • Arash Razmkhah 2
  • Hasan Ghasemzadeh 3
  • Hamidreza Vosoughifar 1
1 Department of Civil Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
2 Department of Civil Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
3 Civil Engineering Faculty, K. N. Toosi University of Technology, Tehran, Iran
چکیده [English]

The infiltration of crude oil and its derivatives into the soil leads to changes in the mechanical behavior of the soil in addition to detrimental and environmental problems. This study aims to evaluate the bearing capacity of geocell-reinforced strip footings laid on oil-contaminated sand under eccentric load via numerical modeling using PLAXIS 2D. The behavior of the footing is assessed regarding various oil contents of 0, 3, 6, 9, and 12% under loading with different eccentricities of e/B=0, 1/12, 1/6, and 1/3. Numerical results revealed that soil pollution has a negative effect on the performance of strip footings, so that an increase in oil content led to a reduction in the magnitude of the load capacity. It was observed that reinforcement with geocell increases the bearing capacity of footing located on the oil-contaminated medium under different eccentricities. The effect of reinforcing with geocell was higher for contaminated soil compared to clean one. Further, the load capacity improvement factor (IF) increased by increasing oil content and settlement value. The results revealed that the reinforcing effect increased with an increase in load eccentricity for both clean and contaminated soils. In addition, the use of geocells is most effective when the loading is outside the core of the foundation, i.e., e/B>1/6. The footing tilting around the centerline axis of the footing due to load eccentricity as well as soil reinforcement with geocell led to a reduction in the stress-affected zone and as a result the displacement depth of the soil beneath the foundation.

کلیدواژه‌ها [English]

  • Bearing capacity
  • Strip footing
  • Geocell
  • Sand
  • Eccentricity
  • Oil-contaminated

مراجع

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نشریه علمی ژئومکانیک نفت
دوره 6، شماره 3
شماره ویژه انگلیسی
آبان 1402
صفحه 58-73

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