ارزیابی ریزساختاری تأثیر آلاینده آلی نفت خام بر خواص ژئوتکنیکی و ژئوتکنیک زیست محیطی خاک مارن سازند میشان

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده فنی مهندسی، دانشگاه هرمزگان، بندرعباس

چکیده

اکثر صنایع و پالایشگاه ­های جنوب ایران بر روی بستر مارنی قرار دارند. خاک ­های مارنی از لحاظ ژئوتکنیکی و ژئوتکنیک زیست‌محیطی در حالت خشک و مرطوب رفتار کاملاً متفاوتی دارد. حساسیت زیاد خاک ­های مارنی در حضور رطوبت و آلاینده ­های آلی می­تواند در پروژه ­های مهندسی مشکل­ آفرین شود. از این­رو هدف این مقاله، مطالعه رفتار ژئوتکنیکی و ژئوتکنیک زیست­ محیطی خاک مارن در معرض آلاینده آلی نفت خام است. بدین­ منظور به خاک مارن مقادیر 0، 2، 5، 10، 15، 20 و 30 درصد وزن خشک خاک نفت خام افزوده شد، سپس با انجام آزمایش ­های مختلف ژئوتکنیکی (مقاومت فشاری محصورنشده، وارفتگی، حدود اتربرگ، نفوذپذیری) و ریزساختاری (XRD و SEM) تأثیر آلاینده نفت خام بر خصوصیات ژئوتکنیکی و ژئوتکنیک زیست‌محیطی خاک مارن بررسی شده ­است. از مهم­ترین نتایج مقاله حاضر، پایداری خاک مارن در برابر وارفتگی در حضور آلاینده آلی نفت خام است. افزایش میزان نفت خام در خاک منجر به تغییر دامنه خمیری و تغییر رفتار خاک از رس با خاصیت خمیری زیاد (CH) به سیلت با خاصیت خمیری زیاد (MH) شده ­است. پایش ریزساختاری خاک ­های مارنی تحت آزمایش پراش اشعه ایکس (XRD) نشان می­دهد که افزایش غلظت آلاینده نفت خام باعث تغییر محسوسی در قله اصلی کانی ­های رسی نشده­ است. تصاویر (SEM) نیز بیانگر ایجاد ساختار فلوکوله با افزایش غلظت آلاینده است. از سوی دیگر حضور 30% آلاینده آلی نفت خام موجب شده، مقاومت فشاری خاک مارن با کاهش 88% از kPa880 به kPa104 شده ­است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Microstructural Examination of Effects of Organic Crude Oil Pollutant on the Geotechnical Properties and Geo-Environmental of Marl Soil of Mishan Formation

نویسندگان [English]

  • Mohammad Amiri
  • Behzad Kalantari
  • Fatemeh Basereh
University of Hormozgan, Faculty of Engineering, Bandar Abbas, Iran
چکیده [English]

The expansion of oil-dependent industries has caused a growing rate of oil extraction and increasing oil- and its derivatives-contaminated water and soil. The impacts and damages caused by oil pollution on human resources, water, and the environment have been very complicated. Oil and its derivates leakages into the soil can change its physical and mechanical properties. Oil-contaminated lands are thought of as the main challenge to the environment. Fuel and oil-reserve sites are common oil leak sites that may penetrate the soil. However, most Bandar Abbas refineries are situated on marl soil beds. Marl is composed of clay, and calcium carbonates of varying degrees of 20-65%, which, having been hardened, are converted into marl soil, thus becoming physically stiff and impermeable. Marl soil has high stiffness and shear strength under dry conditions, as these properties experience lower rates under wet conditions. The volatile behavior of the marl soil in water and organic pollutants makes it problematic when used in geotechnical projects. Thus, the present research takes a microstructural approach to investigate the geotechnical properties and environmental geotechnics of the marl soil contaminated with varying degrees of crude oil.

کلیدواژه‌ها [English]

  • Organic oil pollutant
  • Marl
  • Geotechnical properties
  • Microstructure

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