بررسی تأثیر شکل مقطع حفاری بر اصطکاک جدار و رفتار خزشی میخ‌های گروتی در گونه‌ای از خاک مارن زیتونی تبریز

نوع مقاله : پژوهشی

نویسندگان

دانشگاه تبریز

چکیده

استفاده از سیستم میخکوبی به‌دلیل مزایای فراوان آن، از راهکارهای مرسوم برای تثبیت دیواره‌های گود محسوب می‌شود. باتوجه به رفتار متفاوت خاک‌های مارنی در کوتاه و بلندمدت و نیز نقش اساسی اصطکاک بین گروت سیمانی با خاک اطراف خود در دیوارهای میخ‌کوبی‌شده، در این تحقیق به بررسی مقاومت کششی و رفتار خزشی میخ‌ها در گونه‌ای از خاک مارن‌سبز، پرداخته شده‌است. بدین منظور تعداد شش عدد میخ به قطر 11/0 و به‌طول 4 متر در حالت قائم و دو میخ با همان مشخصات در حالت افقی با زاویۀ 15 درجه نسبت به افق در مقیاس واقعی اجرا و اثر شکل مقطع حفاری در مقاومت کششی و رفتار خزشی میخ‌ها، مورد بررسی قرار گرفت که حاکی از افزایش 20 الی 25 درصدی مقاومت کششی میخ‌های اجراشده با حفاری سه‌پره‌ای (جدار ناصاف) نسبت به حالت حفاری با جدار صاف در میخ‌های قایم و افزایش حدود 15 درصدی آن در میخ‌های افقی می‌باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Field Study of The effect of Drilling Type on tensile strength and creep behavior of soil nails in Tabriz Green marl

نویسندگان [English]

  • gholam Moradi
  • siamak zadkarim
  • hoshang Katebi
Tabriz
چکیده [English]

Using the Soil Nailing due to its numerous advantages, the traditional approach is to stabilize the excavation walls fitted. Due to the different behavior of marl soils in short and long-term and fundamental role of friction between soil cement grout around the walls were nailed, In this study, tensile strength and creep behavior of soil nails to maintain green marl are discussed. Therefore, the number 6 nails diameter of 11 cm and a length of 4 m in vertical and 2 achieve the same as the horizontal at an angle of 15 degrees to the horizon scale has been constructed and the effect of Drillings Type on the tensile strength and creep behavior were investigated. the results indicates 20 to 25% increasing in tensile strength of nails in vertical mode and 15% increasing in a horizontal mode implemented with non-smooth drill compared to smooth drill.

کلیدواژه‌ها [English]

  • Marl
  • Soil Nailing, Drilling Type
  • Tensile Strength
  • creep
  • Field Study
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