بررسی عددی تاثیر آلودگی نفت خام بر پایداری شیروانی خاک رسی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده عمران، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران

2 دانشکده عمران، دانشگاه آزاد اسلامی واحد علوم و تحقیقات، تهران، ایران،

3 استادیار دانشکده عمران، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران

چکیده

حضور مواد نفتی (آلودگی­ های نفت خام) در خاک رسی با حد روانی کم (CL) در اثر فرآیندهای فیزیکی و شیمیایی باعث ایجاد تغییرات در منحنی­ تنش–کرنش، گوه گسیختگی، ناحیه پلاستیک و انرژی کرنشی شیروانی­ های خاکی در مقایسه با خاک غیرآلوده می ­شود. این تغییرات اغلب باعث کاهش ضریب اطمینان در برابر گسیختگی، افزایش ناحیه پلاستیک و کاهش پایداری شیروانی­ های خاکی می­ شود. تاکنون تاثیر آلودگی نفت خام بر ­روی پارامترهای مقاومت برشی خاک به وسیله آزمایش برش مستقیم و مدول عکس­ العمل بستر به وسیله آزمایش بارگذاری صفحه ­ای برای انواع خاک­های رسی و ماسه ­ای آزمایش شده است. اکنون در این پژوهش اثر تغییرات میزان آلودگی نفتی در بازه 0 تا 16% (0-4%-8%-12%-16%) بر روی ضریب اطمینان پایداری شیروانی خاک رسی به وسیله مدل ­سازی عددی روش اجزاء محدود در نرم‌افزار ABAQUS انجام گرفته است. ارتفاع شیروانی­ های خاک رسی  m10،  m13 و  m16 و زاویه شیب شیروانی خاکی ◦53 می­ باشد. نتایج این پژوهش نشان می ­دهد که افزایش آلودگی نفتی، سبب کاهش میزان پایداری در شیروانی خاک رسی می­ شود. به طوری که پیش­ بینی می­ شود که میزان ضریب اطمینان شیروانی خاک رسی با افزایش آلودگی نفتی از 0 تا 16% به اندازه 72% کاهش یابد. همچنین افزایش تنها 4% در میزان آلودگی نفت خام در شیروانی خاک رسی (12% تا 16% آلودگی نفتی)، سبب افزایشی معادل 2 الی 3 برابری در جابه ­جایی افقی و افزایش 3 الی 4 برابری در جابه­ جایی قائم می­ شود. 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The numerical study of the effect of the crude oil contamination on the stability of clayey soil slope

نویسندگان [English]

  • kamran rahgooy 1
  • saeed mirakhorli 2
  • amin bahmanpour 3
1 Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
3 Assistant Professor, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
چکیده [English]

The presence of oily materials (crude oil contamination) in the clayey soil with low liquid limit (CL) causes the occurrence of changes in the stress-strain curve, wedge failure, plastic region, and strain energy of the soil slopes compared the uncontaminated soils due to the physical and chemical processes. These changes mostly cause the decrement in the safety factor against failure, the increment of the plastic region, and the decrement of the stability of the soil slopes. Yet, the effect of crude oil contamination on the parameters of the shear strength of the soil has been tested by the direct shear test as well as the bed reaction module by the plate loading test for various clayey and sandy soils. In this research, the effect of the oil contamination changes in the range of 0-16% (0-4%, 4-8%, 8-12%, 12-16%) on the safety factor of the stability of clayey soil slope has been studied by the numerical modeling of finite element method in ABAQUS software. The heights of clayey soil slopes are 10, 13, and 16 meters and the degree of the soil slope is 53. The results of this research show that the increment of the oil contamination will lead to the decrement of the stability of the clayey soil slope. It can be predicted that the safety factor value of the clayey soil slope can decrease up to 72% by increasing the oil contamination from 0 to 16%. Also, a 4% increment in the amount of crude oil contamination in clayey soil slope (12% to 16% oil contamination) can increase the horizontal displacement by 2 to 3 times, and vertical displacement by 3 to 4 times.

کلیدواژه‌ها [English]

  • Clayey soil
  • finite element method
  • crude oil contamination
  • SRM method
  • soil slope

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نشریه مهندسی عمران امیرکبیر
دوره 54، شماره 6
شهریور 1401
صفحه 2259-2280

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