بررسی آزمایشگاهی تاثیر روش اختلاط خاک در عمق بر خصوصیات مهندسی خاک رس نرم تثبیت شده با سرباره و آهک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده عمران، دانشگاه آزاد اسلا می واحد اراک، اراک، ایران

2 دانشگاه آزاد اسلامی اراک

چکیده

خاک‌های رسی نرم عموما دارای تراکم‌پذیری زیاد و مقاومت کم بوده و حضور آنها در محل پروژه‌های عمرانی همواره مشکل آفرین است. یکی از راهکارهای مفید برای اصلاح این نوع خاکها، تثبیت آنها به شیوه‌های گوناگون است. در پژوهش پیشرو اثر افزایش عمق بر خصوصیات مهندسی خاک رسی نرم تثبیت‌شده به روش نوین تراش و اختلاط خاک، به صورت آزمایشگاهی شبیه‌سازی شده و مورد تحلیل وبررسی قرار گرفته است. به این منظور ابزار و دستگاه‌های لازم جهت ساخت نمونه‌ها و اعمال فشارهای قائم معادل با اعماق مختلف قرارگیری آنها، طراحی و ساخته شدند و در فرآیند آزمایش‌های آزمایشگاهی مورد استفاده قرار گرفتند. همچنین استفاده از دوغابی حاوی مقادیر مشخص سرباره کوره آهن گدازی و آهک هیدراته جهت استفاده در این شیوه جدید، برای اولین بار پیشنهاد شده است. نمونه‌های شبیه‌سازی شده به مدت 28 و 56 روز تحت فشارهای قائم مختلف و شرایط اشباع، عمل‌آوری شدند تا تاثیر این شرایط بر خصوصیات فیزیکی و مکانیکی آنها تعیین شود. نتایج حاصل نشان دادند که افزایش عمق باعث کاهش رطوبت نمونه‌ها و افزایش وزن مخصوص اشباع، خشک و همچنین بهبود پارامترهای مقاومتی آنها می‌شود. همچنین با گذر از عمقی مشخص که عمق بحرانی نامیده شده است، تغییرات ایجاد شده به ویژه در خصوصیات فیزیکی نمونه‌ها ناچیز بوده است.

کلیدواژه‌ها


عنوان مقاله [English]

Laboratory Investigation of the Effect of Deep Soil Mixing Method on Engineering Properties of Soft Clay Stabilized by Slag and Lime

نویسندگان [English]

  • Parham Rabbani 1
  • seyed hamid LAJEVARDI 2
1 Department of Civil Engineering, Islamic Azad University, ARAK Branch, ARAK, IRAN
چکیده [English]

Soft clayey soil generally has high compressibility and low strength. Presence of this soil type in the site of civil projects can always be a challenge. Soil stabilization is one of the useful ways to improve problematic soils. Cutter Soil Mixing (CSM) is almost a new method for deep stabilization. This laboratory study, investigate the effect of various depths of stabilization on the engineering properties of soft clay treated by CSM method. To prepare samples, simulate different depths and related overburden pressures new devices were designed, modified and made. Moreover, mixture of blast furnace slag and hydrated lime slurry was used in this method for the first time. Prepared samples were cured for 28, 56 days under saturated conditions, and various overburden pressures to investigate the effect of this stabilization method on physical and mechanical properties of them. The obtained results revealed that increasing the depth of stabilization decreases the moisture content of the samples, increases their saturated/dry densities and improves the strength parameters of them. Moreover, mechanical properties of the samples showed fewer changes by passing the specific depth.

کلیدواژه‌ها [English]

  • Soft clay
  • Deep soil stabilization
  • Slag
  • Lime
  • laboratory study
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