اثر محیط منفرد و مختلط بیولوژیکی بر خواص مکانیکی-هیدرولیکی ماسه‌‌بادی

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران

2 دانشکده مهندسی عمران، دانشگاه صنعتی اصفهان

چکیده

در سال‌های اخیر استفاده از روش‌های نوین بهسازی برای اصلاح و بهبود خواص ژئوتکنیکی خاک‌ها موردتوجه ویژه قرارگرفته است. در همین راستا بهسازی بیولوژیکی روشی خلاقانه می‌باشد که با استفاده از میکروارگانیسم‌های موجود در خاک و شبکه واکنش‌های بیوشیمیایی باعث بهبود خواص هیدرولیکی و مقاومتی خاک می‌گردد. در این مقاله، بهسازی خاک ماسه‌ای با استفاده از محیط ‌کشت‌های منفرد و مختلط ارزیابی گردیده است. نتایج آزمایشات نشان داد که مقاومت تک‌محوری خاک بهسازی‌شده توسط کشت‌های منفرد و مختلط به­ ترتیب 1391 کیلوپاسکال و 3/1690 کیلوپاسکال می‌باشد که افزایش قابل‌توجهی نسبت به خاک بهسازی‌نشده را نشان می‌دهد. همچنین نتایج نشان داد که مقاومت تک‌محوری و مدول الاستیسیته خاک بهسازی‌شده در حالت کشت مختلط نسبت به کشت منفرد به­ ترتیب 23% و 82% افزایش یافته است. نتایج آزمایش نفوذپذیری نیز عملکرد بهتر کشت مختلط را نسبت به کشت منفرد در کاهش نفوذپذیری به­ میزان 34% را نشان می‌دهد. همچنین نفوذپذیری خاک بهسازی‌نشده به­ ترتیب نسبت به شرایط منفرد و مختلط 3/77% و 8/86% کاهش یافته است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Impact of Biologic Single and Mixed Medium on Mechanical-Hydraulic properties of Dune Sand

نویسندگان [English]

  • Morteza Khaleghi 1
  • Mohammad Ali Rowshanzamir 2
1 Faculty of Civil Engineering, Isfahan University of Technology, Isfahan, Iran
2 Faculty of Civil Engineering, Isfahan University of Technology, Isfahan, Iran
چکیده [English]

Today, new improvement methods to improve the geotechnical properties of soils are considered. Although a lot of improvement techniques are in use around the world, they have their own advantages and disadvantages. Chemical, physical, mechanical, biological and electrical techniques may be named as the common methods of soil improvement (Karol, 2003). Some of the methods, particularly those using cement and other toxic chemical grout, may cause environmental problems which limit their usage. In this regard biological improvement is an innovative method that uses microorganisms in the soil and biochemical reaction networks, the soil physical and mechanical properties are improved. In this research, mixed culture performance was studied against single culture of bacteria on physical strength properties of sandy soil, as the stabilization efficiency was evaluated in terms of the soil compressive strength, secant stiffness, and permeability with unconfined compression and falling head tests, respectively.

کلیدواژه‌ها [English]

  • Biological improvement
  • Single and mixed culture
  • Unconfined compression
  • Permeability
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