ظرفیت باربری گروه شمع حفاری‌شده پس‌تزریق در مجاورت شیروانی ماسه‌ای

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 دانشکده فنی و مهندسی، واحد اهواز، دانشگاه آزاد اسلامی، اهواز

2 دانشکده مهندسی عمران، واحد نجف‌آباد، دانشگاه آزاد اسلامی، نجف‌آباد

10.22034/ceej.2025.65500.2413

چکیده

از گروه شمع به‌عنوان پی ساختمان‌‌ها، پل‌‌ها و برج‌های انتقال استفاده می‌گردد. در محیط‌های شهری به‌دلیل عدم امکان استفاده از شمع کوبشی (Driven Pile) معمولاً از شمع‌های حفاری‌شده که دارای ظرفیت باربری کمتری نسبت به شمع کوبشی هستند، استفاده می‌گردد. یکی از روش‌های متداول افزایش ظرفیت باربری شمع‌های حفاری‌شده، استفاده از روش تزریق پرفشار دوغاب سیمان در نوک شمع می‌باشد. درخصوص رفتار گروه‌های شمع پس‌تزریق ‌شده (Post Grouted Drilled Pile) در مجاورت شیروانی تاکنون تحقیقی صورت نگرفته است. در این تحقیق، به‌کمک روش المان محدود و با استفاده از نرم‌افزار PLAXIS3D به بررسی اثر شیروانی ماسه ­ای برروی ظرفیت باربری، ضریب راندمان و میزان چرخش سرشمع گروه‌های شمع پس‌تزریق‌ شده پرداخته می‌شود. در این تحقیق، گروه‌های شمع پس‌تزریق ‌شده 2×2، 1×2 و 1×3 با قطر 1، 5/1 و 2 متر، با نسبت طول مدفون به ارتفاع شیروانی 33/0، 67/01 و فواصل شمع 3، 4 و 5 برابر قطر شمع، در مجاورت شیروانی ماسه‌ای به ارتفاع 30 متر و شیب 30 درجه به‌صورت سه‌بعدی مدل گردیدند. اثر عوامل مختلفی همانند قطر شمع، نسبت طول مدفون به ارتفاع شیروانی و فاصله شمع‌ها از یکدیگر برروی ظرفیت باربری گروه شمع پس‌تزریق‌شده در نوک شمع مورد بررسی قرار گرفت. نتایج نشان داد، پروسه پس‌تزریق باعث کاهش چرخش سرشمع گردید. با افزایش فاصله شمع‌ها از یکدیگر و افزایش قطر شمع‌ها، ضریب BCR افزایش یافت. اثر پروسه پس‌تزریق برروی افزایش ظرفیت باربری و کاهش چرخش سرشمع گروه شمع خطی (Linear Pile Group) موازی رأس شیروانی، بیشتر از گروه شمع خطی عمود بر رأس شیروانی بود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Bearing Capacity of a Post Grout Drilled Pile Group Adjacent to a Sandy Slope

نویسندگان [English]

  • Reza Mohammad Ali Nejad 1
  • Meysam Bayat 2
1 Department of Civil Engineering, Ahwaz Branch, Islamic Azad University, Ahwaz, Iran
2 Department of Civil Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
چکیده [English]

In this research, using the finite element method and PLAIXS3D software, the bearing capacity of a post-grouted pile group installed at the crest of sandy slope is investigated. The effects of factors such as pile diameter, the ratio of embedded length to slope height, pile spacing, and the orientation of the linear pile group relative to the crest of slope on bearing capacity, efficiency coefficient, and tilting of cap are examined. In this study, pile groups with 3 different diameters, 3 different ratios of embedded length to slope height, and 3 different pile spacings were modeled at a distance equal to the pile diameter from the top of the sandy slope.

کلیدواژه‌ها [English]

  • Pile group
  • Post grout
  • Slope
  • Finite element
  • Bearing capacity
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