تثبیت زیستی ماسه به روش تزریق سطحی

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه بین المللی امام خمینی( ره)، قزوین، ایران

چکیده

اکثر روش‌ای بهسازی خاک پرهزینه، زمانبر، از لحاظ اجرایی سخت و از نظر محیط زیست نیز خسارات زیادی به طبیعت وارد می‌کنند. بهسازی زیستی یکی از روش‌ای نوین بهسازی خاک است که خیلی از مشکلات مذکور را ندارد. یکی از مشکلات روش­های بهسازی عمومی خاک، تخریب محیط زیست است . در این مطالعه کارایی روش بهسازی زیستی در بهسازی ماسه سست و خشک به روش تزریق سطحی مورد بررسی قرار گرفت. برای بررسی قابلیت و موفقیت تزریق، آزماش‌هایی مانند مقاومت تک محوری، کشش غیر مستقیم )برزیلی(، درصد کربنات کلسیم، سرعت موج برشی و غیره انجام گردید. نتایج بیانگر این است که بهسازی زیستی موجب سیمانی شدن ماسه و افزایش مقاومت آن شده است. بعلاوه روشتزریق سطحی، قابلیت سیمانی کردن و تثبیت ماسه سست را تا عمق مورد نظر دارد. عمق تزریق و اصلاح خاک تابع روش اجرا یی و تعداد تزریق و بسیاری عوامل دیگر است. نتایج آزماش‌ها نشان داد که افزایش مقاومت و نیز درصد کربنات کلسیم تشکیل شده با افزاش عمق کاهش می‌یابند. همچنین نتایج نشان می‌دهد افزایش مقاومت ناشی از بهسازی زیستی تنها به مقدار کلسیت تشکیل شده بستگی ندارد بلکه محل تشکیل رسوب و تعداد پیوندها اثر بیشتری دارند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Bio-stabilization of Sand by Surface Percolation

نویسندگان [English]

  • A. Karimian
  • M. Hassanlourad
  • Gh. Karimi
Department of Civil Engineering, Imam Khomeini International University, Qazvin, Iran
چکیده [English]

Most traditional soil improvement methods are time consuming, expensive, require heavy machinery and are environmentally detrimental. As a more environmentally favorable ground improvement method, the bio-cementation of soil offers an alternative to traditional soil improvement techniques. This method is based on microbial precipitation of calcium carbonate. The role of bacteria is producing urease enzyme to catalyzing the hydrolysis of urea. In the presence of calcium ions, the produced carbonate ions in hydrolysis of urea react with the calcium ions and calcium carbonate sediment is formed. This paper investigates the applicability of the bio-remediation of dry loose sand by surface percolation. To evaluate the success of treatment, a series of laboratory experiments was conducted, including, shear wave velocity, unconfined compressive strength, Brazilian tensile strength, calcium carbonate content and etc. The study revealed that the bio-remediation technique causes the improvement of soil strength as a result of the cementation of sand particles. Furthermore, the surface percolation method has the potential of cementation and stabilization of loose sand with desirable depth. Increase in soil strength and calcium carbonate content decreases with increase of depth. Results also showed that increase of strength due to bio-improvement depends to calcium carbonate content, its spatial distribution in pores and particle-to-particle binding numbers.

کلیدواژه‌ها [English]

  • Soil Stabilization
  • Bio-Cementation
  • Microorganism
  • Calcium Carbonate Precipitation
  • Surface Percolation
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