تعیین عمق مؤثر نفوذ ستون سنگی در شیب‌های خاکی با استفاده از روش‌های عددی و آزمایشگاهی

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

دانشکده فنی مهندسی، دانشگاه رازی

10.22034/ceej.2018.7572

چکیده

پایدارسازی شیب‌های خاکی یکی از مسائلِ مهمی است که در کانون توجه مهندسین ژئوتکنیک قرار دارد. یکی از روش‌های متداول و مناسب برای مسلح کردن شیروانی‌های خاکی استفاده از ستون‌های سنگی است. استفاده از روش‌های عددی و تحلیلی در پایدارسازی شیب‌های خاکی به کمکِ ستون سنگی، از جمله روش‌های متداولی است که توسط محققین مختلف مورد بررسی قرار گرفته است. پایداری شیب‌های خاکی در اثر عوامل مختلف مانند نیروهای زلزله، تغییر تراز سطح آب زیر زمینی، خاکریزی در بالادست شیب و یا خاکبرداری از پایین دست شیب، تهدید می‌گردد که همگی این عوامل سبب افزایش نیروهای محرک شده و در نهایت ناپایداری در شیب خاکی پدیدار می‌گردد. هدف از انجام این پژوهش، مطالعه‌ عددی و آزمایشگاهیِ بررسی عملکرد ستون سنگی و میزان عمق نفوذِ مؤثرِ آن در لایه‌ متراکم، در شیب‌های خاکیِ دولایه‌ ماسه‌ای است. در این پژوهش با استفاده از ساخت مدل شیروانی ماسه‌ای و اشباع آن به ‌کمک بارش و سپس اعمال بارگذاری، عمق مناسب نفوذ ستون سنگی در لایه‌ متراکم به دست آمده است که به عنوان نوآوری کار مطرح می‌گردد. نتایج حاصل از آزمایشگاه به‌ روش تفاضل محدود سه ‌بعدی (FLAC3D) نیز مورد تأیید قرار گرفته‌اند. همچنین نتایج مدل‌سازی‌های آزمایشگاهی و تحلیل‌های عددی نشان داده‌اند که وجود ستون سنگی در وسط شیبِ ماسه‌ای دو لایه تأثیر چشمگیری در افزایش پایداری شیروانی مسلح دارد.

کلیدواژه‌ها

عنوان مقاله [English]

Determination of Effective Penetration Depth of Stone Column in Earth Slope using Numerical and Experimental method

نویسندگان [English]

  • Mohamad Hajiazizi
  • Masoud Nasiri
Faculty of Engineering, Razi University, Kermanshah
چکیده [English]

Stabilization of earth is one of the main issues in the geotechnical engineering. A common method for reinforcing earth slopes is using stone columns. In all earth slopes, the primary way for stabilization is the excavation in slope crest and/or filling slope toes, if this action would not increase safety factor enough, other procedures should applied. Three common styles of stabilization methods are; vertical reinforcement (such as stone columns), horizontal reinforcement (like geotextile layers), oblique reinforcement (such as nailing). Using numerical and analytical approaches in reinforced slope stability by stone column is the common method which done by many researchers. Earth slope stability threaten by various factors such as earthquake forces, water table changes, filling upstream and cutting downstream of slope, which increase active forces and finally cause slope instability. When we are suspicious about stability of earth slopes, immediate actions and preventative steps should use for suppression of instability occurrence. The purpose of this research is experimentally and numerically investigates stone column behavior and penetration depth in stiff layer in two-layered sandy slope. In this article sandy slope constructed and the model saturated by raining technique and then loading process carried out. With regard to the processes mentioned above, the penetration depth in stiffer layer gained which is the innovation of this paper. The acquired results confirmed by three-dimensional finite difference method (FLAC 3D). The results of experimental modeling and numerical analysis also indicate that presence of stone column in middle of two-layered sandy slope has a great impact on stability of reinforced slope.

کلیدواژه‌ها [English]

  • Slope stability
  • Stone Column
  • Penetration Depth
  • Layered Soil

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نشریه مهندسی عمران و محیط زیست دانشگاه تبریز
دوره 48.1، شماره 90 - شماره پیاپی 90
بهار 1397
خرداد 1397
صفحه 1-12

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