تثبیت ماسه‌های شرق اصفهان به کمک فناوری زیستی باکتری Halomonas sp. در مقایسه با عملکرد باکتری شاهد Sporosarcina pasteurii (SP)

نوع مقاله : مقاله پژوهشی (کاربردی)

نویسندگان

1 استادیار، گروه مهندسی عمران، دانشگاه فنی و حرفه‌ای، تهران، ایران.

2 استاد، گروه مهندسی عمران، دانشگاه VIT، ولور، هند.

چکیده

اخیراً بهبود و مقاوم‌سازی خاک به کمک رسوب‌زایی کربنات توسط میکروب‌ها (MICP) حلقه‌ای بین فناوری زیستی و مهندسی زمین‌شناسی ایجاد کرده است. تکوین چنین روشی می‌تواند هم‌زمان تأثیرات دوسویه مفید زیست‌محیطی و ژئوتکنیکی ایجاد کند. در این پژوهش برای مقاوم‌سازی ماسه‌های شرق اصفهان، از باکتری‌هایHalomonas sp.  و Sporosarcina pasteurii (SP) (استاندارد) استفاده شده است. در این راستا طی دوره‌های 42 روزه آزمایش‌های مختلفی به‌منظور بررسی بهبود مقاومتی خاک انجام گردیده است. در این مطالعه مشخص گردید که خواص مهندسی خاک‌های موردآزمایش با تحریک باکتری‌های موجود در آن به کلسیت‌زایی، به‌صورت قابل‌توجهی تغییر یافته است. بررسی این ویژگی‌ها به کمک آزمایش‌های برش مستقیم و امواج فشاری نشان می‌دهد که مقاومت خاک به کمک باکتری Halomonas sp در مقایسه با باکتری استاندارد (SP) به‌صورت امیدوارکننده‌ای بهبود یافته است؛ به‌طوری که سرعت امواج فشاری در نمونه مقاوم شده توسط باکتری به حدود 390 متر بر ثانیه رسیده است و زاویه اصطکاک داخلی خاک نسبت به باکتری استاندارد با شیب ملایم‌تری افزایش یافته است.  

کلیدواژه‌ها

عنوان مقاله [English]

Sand Soil Stabilization Using Halomonas Bacterial Calcite Precipitation in East of Isfahan and Comparison with Sporosarcina Pasteurii (SP) Bacteria Function

نویسندگان [English]

  • Hoseinali Bagi 1
  • Ali Rahimi 2
1 Assistant Professor, Department of Civil Engineering, Technical and Vocational University, Tehran, Iran.
2 Professor, Department of Civil Engineering, VIT University, Vellore, India.
چکیده [English]

Biocementation is a recently developed link in geological engineering and biotechnology which deals with the application of microbiological activities to improve the engineering properties of soils and creates the positive role of geotechnical engineering for protection of the environment. In this investigation, Halomonas sp. and Sporosarcina Pasteurii (SP) was used for biocementation of sands in eastern area of Isfahan, Iran.  As compared with conventional microbial induced calcite precipitation (MICP) methods, this strategy which uses free urease catalysts to secure bacterial enzyme induced calcite precipitation (MICP) appears to offer an improved means of bio-stabilizing sand soils in a 42day period. After biocementation, the velocity of ultrasonic waves reached approximately 390m/s and the internal angle of friction in bacterial sandy samples increased. Tests were conducted to evaluate the feasibility of using ultrasonic testing for stabilization applications. The ultrasonic testing consisted of determining primary-wave (P-wave) velocities of stabilized mixtures.

کلیدواژه‌ها [English]

  • Stabilization
  • Sands
  • Halomonas bacteria
  • Biotechnology

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فصلنامه علمی کارافن
دوره 19، شماره 1 - شماره پیاپی 57
فنی و مهندسی
خرداد 1401
صفحه 655-672

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سابقه مقاله

  • تاریخ دریافت: 15 شهریور 1400
  • تاریخ بازنگری: 25 دی 1400
  • تاریخ پذیرش: 30 بهمن 1400

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