مطالعه رفتار خاک در شیب‌های خاکی غیرمسلح و مسلح شده با شمع

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 دانشکده فنی مهندسی، دانشگاه رازی، کرمانشاه

2 دانشکده فنی مهندسی، دانشگاه بناب

چکیده

در این مقاله تاثیر استفاده از شمع در پایداری و تغییر شکلهای ایجاد شده در شیب‌ها با استفاده از مدلهای فیزیکی و عددی مورد مطالعه قرار گرفته است. برای بررسی الگوی تغییر شکل‌های ایجاد شده در شیب از روش تصویری PIV استفاده شده است. نتایج به دست آمده نشان می‌دهند که وجود لایه نازکی از خاک ضعیف تاثیر عمده‌ای در سازوکار گسیختگی و پایداری شیب‌ها دارد. بر اساس مطالعات انجام یافته مشاهده گردید در شیب‌های همگن و چند لایه بهینه موقعیت قرارگیری شمع‌ها برای افزایش ضریب اطمینان پایداری در وسط شیب می‌باشد همچنین نتایج به دست آمده نشان می‌دهند بهینه موقعیت نصب شمع برای افزایش پایداری شیب متفاوت از بهینه موقعیت آن برای افزایش ظرفیت باربری پی‌های مستقر بر تاج شیب می‌باشد و در شیب‌هایی که در حالت اولیه بدون اعمال سربار ضریب اطمینان پایداری آنها بیشتر از یک می‌باشد بیشترین مقدار نسبت ظرفیت باربری برای پی‌های مستقر در تاج شیب (BCR)، برای شیب‌های همگن هنگامی به دست می‌آید که شمع‌ها بین وسط و تاج شیب نصب گردند. ولی بهینه موقعیت نصب شمع برای شیب‌های چند لایه با میان لایه ضعیف شیب‌دار، در نزدیکی تاج شیب می‌باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation on Behavior of Piled and No-Piled Earth slopes

نویسندگان [English]

  • Hasan Sharafi 1
  • Yones Sojoudi 2
1 Engineering Faculty, Razi University, Kermanshah, Iran
2 Engineering Faculty, Bonab University, Tabriz, Iran
چکیده [English]

In this paper, the feasibility of using piles to stabilize layered and homogenous earth slopes were studied. A set of physical modeling of foundations was performed adjacent to homogenous and layered slopes. The deformation pattern and shear strains of soil near slope and below surcharge load were studied. The effect of pile and soft soil layer locations on improvement ratio (safety factor of stabilized slope with pile / safety factor of the slope stability without piles), soil element displacement, slope stability and slip surface shape in homogenous and layered slope were investigated. The experimental and numerical results show, existence of thin layer of soft soil layer, has considerable effects on failure mechanism and stability of slope. Based on research results, it was found, the optimum location of pile for increasing slope stability was in middle of slope the test results showed that, for layered slopes, optimum location of pile for increasing bearing capacity of foundation which is located on slope crest is near slope crest. For homogenous slope optimum location of pile for increasing foundation bearing capacity was found between middle of slope and crest. Comparing piled and no piled slopes, showed in piled slope slip surface depth below the surcharge load are larger than no piled slope. Studies on soft soil layer effects on slope stability shows; Existence of soft soil layer has significant effect on slope stability, and critical failure surface obviously controlled by soft bound layer.

کلیدواژه‌ها [English]

  • Pile
  • improvement ratio
  • PIV method
  • Physical Modeling

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