مقایسه رفتار شمع های جابجایی-جایگزینی به صورت آزمایشگاهی و میدانی (مطالعه موردی؛ ماسه انزلی)

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری ، گروه مهندسی عمران، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

2 دانشیار، گروه مهندسی عمران ، دانشگاه پیام نور ،تهران، ایران

3 استاد، دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی امیرکبیر، تهران، ایران

4 استادیار، گروه مهندسی عمران، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

چکیده

با توجه به توسعه شهرها، بنادر، مراکز تجاری و لزوم بهره گیری حداکثری از زمین های ساحلی و فراساحلی، استفاده از پی های عمیق در انتقال بارهای روسازه به بستر مناسب و یا تأمین ظرفیت باربری به طرق ممکن ناشی از باربری کف و یا جداره امری بدیهی و غیرقابل اجتناب است. در همین راستا استفاده از شمع های کوبشی و درجاریز مرسوم بوده که سروصدا و ارتعاش زیاد ناشی از کوبش و همینطور سختی ها و محدودیت های اجرایی شمع های درجاریز موجب شده است تا گونه جدیدی از شمع ها که با استفاده از نیروی گشتاور و مقدار اندکی نیروی محوری فشاری در خاک نصب می گردند، مورد استفاده قرار بگیرند. شمع پیچشی - پره ای و جابجایی- جایگزینی را می توان از این نوع شمع های نوین دانست. با توجه به افزایش روزافزون استفاده از این شمع ها هنوز مطالعات انجام شده بر روی آنها اندک بوده و نیاز به انجام بررسی های بیشتر بر روی رفتار آنها در خاک ها و شرایط مختلف احساس می شود. از این رو در تحقیق حاضر در دو بخش میدانی و آزمایشگاهی با انجام آزمایش های بارگذاری کششی و فشاری به ارزیابی رفتار این شمع ها پرداخته شده است. سه مدل شمع Helical،Subasa و Drilled displacement pile در بخش آزمایشگاهی در دستگاه فشار همه جانبه مخروطی دانشگاه امیرکبیر اجرا و مورد بارگذاری قرار گرفته و با مطالعات در بخش میدانی مقایسه شده اند. شمع جابجایی- جایگزینی تحقیق در کشش و فشار عملکرد بهتری از بقیه شمع ها داشته و این شمع در هر دو زمینه آزمایشگاهی و شرایط میدانی رفتار سخت تر و ظرفیت بهتری نسبت به دو شمع دیگر اتخاذ کرده است. همچنین گشتاور مورد نیاز این شمع در مقایسه با سایر شمع ها مقادیر بالاتری را داشته است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Comparison of behavior of Drilled Displacement piles in laboratory and field (Case study; Anzali sand)

نویسندگان [English]

  • Saeed Hejazirad 1
  • Soheil Ghareh 2
  • Abolfazl Eslami 3
  • Navid Ganjian 4
1 PhD Candidate, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
2 Associate Professor, Department of Civil Engineering, Payame Noor University, Tehran, Iran
3 Professor, Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran
4 Assistant professor, Department of civil engineering, science and research branch, Islamic Azad University, Tehran, Iran
چکیده [English]

Deep foundation are used to transfer loads of large and high rise building to subsurface layers that have sufficient strength. Piles are one of the most common deep foundations which are installed in the form of driven an bored for many years, the high noise and variation by the driving and the hardness and the limitations of the performance of the bored piles caused to use a new type of pile which installed to the soil using torque and a small amount of axial compressive load, Helical pile can be considered as such piles. Drilled displacement piles are another type of this piles. Due to the increasing use of these piles, there are still limit studies on them and there is a need to study their behaviour in different soils and conditions. Three models of piles in the laboratory section were implemented and loaded in FCV-AUT and compared with studies in the field. Compressive and tensile static load were performed according to ASTM D1143 and ASTM D3689 standard and rapid loading test.Drilled displacement pile in tensile and compressive performance was better than other torque driven pile. Because of concrete is cheaper than steel, these piles can be a good alternative for driven and bored pile in urban areas.

کلیدواژه‌ها [English]

  • FCV-AUT
  • Drilled Displacement piles
  • Helical piles
  • Static loading
  • Physical modeling

مراجع

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سابقه مقاله

  • تاریخ دریافت: 10 آبان 1399
  • تاریخ بازنگری: 14 آذر 1399
  • تاریخ پذیرش: 30 دی 1399

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