بررسی تأثیر باکتری در خصوصیات ژئوتکنیکی خاک رس آلوده به نفت خام

نویسندگان

1 دانش‌آموخته کارشناسی‌ارشد مهندسی عمران، گروه مهندسی عمران، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران

2 دانشیار گروه مهندسی عمران، واحد تبریز، دانشگاه آزاد اسلامی، تبریز، ایران

چکیده

آلودگی خاک­ها ناشی از آلاینده نفت­خام یکی از موضوعات مهم در ژئوتکنیک زیست­محیطی می­باشد. به ویژه این آلودگی در لایه­­های خاکی مناطق نفت­خیز که لوله­های انتقال نفت در آن­ها قرار دارند به دلیل نشت مواد نفتی می­تواند مشاهده گردد. اگرچه نوع جنس خاک (دانه­ای یا ریزدانه) در میزان توسعه آلایندگی ناشی از نفت­خام تأثیر گذار است. امروزه جهت رفع آلودگی آلاینده­های هیدروکربنی از روش­های مختلف نوین استفاده می­شود که یکی از انواع آن کاربرد مواد زیستی (Bio material) است. هدف اصلی از تحقیق حاضر، بررسی تأثیرگذاری کاربرد باکتری بر روی خصوصیات ژئوتکنیکی خاک رس آلوده به نفت خام است. بدین منظور، ابتدا نفت خام به میزان 1، 3 و 5 درصد وزنی با خاک رس مخلوط می­گردد. سپس، باکتری JQ963328.1 به خاک آلوده اضافه شده و به مدت 30 روز عمل­آوری انجام گرفته است. جهت ارزیابی رفتار ژئوتکنیکی خاک تثبیت شده آزمون­های تراکم استاندارد، مقاومت فشاری تک­محوری، برش مستقیم و تحکیم صورت گرفته است. نتایج بدست آمده از تحقیق حاضر نشان می­دهد با افزایش حضور نفت خام در خاک رس توانایی باربری کاسته شده و میزان تورم و نشست افزایش یافته است. از سوی دیگر، با مخلوط کردن باکتری به خاک رس حاوی 5 درصد نفت خام و پس از عمل­آوری مشاهده شد مقاومت فشاری تک­محوری 33 درصد، مقاومت برشی 8/9 درصد افزایش و پتانسیل تورم 23 درصد کاسته شده است.     

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of the Bacteria Effects on the Geotechnical Properties of Clay Soil Contaminated with Crude Oil

نویسندگان [English]

  • H. Amini 1
  • R. Dabiri 2
1 M. Sc. (graduated), Dept., of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran
2 Assist. Prof., Dept., of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran
چکیده [English]

Soil pollution caused by crude oil is one of the important issues in environmental geotechnics. Especially, this type of pollution can be observed in the soil layers of oil-rich areas where oil transmission pipes are located due to the leakage of oil materials. Although the type of soil (granular or fine) is effective in the development of pollution caused by crude oil. Today, various modern methods are used to remove hydrocarbon pollutants, one of which is the use of biological materials. The main propose of present research is evaluate the effect of bacteria application on the geotechnical properties of clayey soil contaminated with crude oil. For this aim, first crude oil is mixed with clay at the rate of 1, 3 and 5 percent by weight. Then, JQ963328.1 bacteria was added to the contaminated soil and cured for 30 days. For evaluating geotechnical properties of improved soil standard compaction, uniaxial compressive strength, direct shear test and consolidation tests have been performed. The results of present study show that with the increase in the presence of crude oil in clay, the bearing capacity has decreased and the amount of swelling and settlement has increased. On the other hand, by mixing bacteria with clay containing 5% crude oil and after curing, it was observed that the uniaxial compressive strength by 33%, the shear strength by 9.8% increased respectively. The swelling potential decreased by 23%. 

کلیدواژه‌ها [English]

  • Clay soil
  • Pollution
  • Crude Oil
  • Bacteria
  • Improvement
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