مطالعه تاثیر اجرای پله بر پایداری دیوار حائل خاک مسلح در مقیاس آزمایشگاهی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه رازی، کرمانشاه، ایران

2 عضو هیات علمی دانشگاه رازی

3 گروه مهندسی عمران دانشکده فنی و مهندسی دانشگاه صنعتی، کرمانشاه، ایران

چکیده

اگر یک دیوار با ارتفاع بلند به چند دیوار با ارتفاع کوتاه‌تر تقسیم شود به آن دیوار پله‌ای( تراس‌ بندی شده) اطلاق می‌شود. در دیوارهای خاک مسلح زمانی که اجرای دیوار با ارتفاع زیاد مورد نظر باشد به دلیل باال رفتن هزینه‌ ها بحث اجرای دیوار پله‌ای می‌تواند مفید واقع شود. بدین منظور مدل‌سازی در مقیاس آزمایشگاهی بر روی دیوار خاک مسلح انجام شد تا عملکرد آنها در هندسه‌های مختلف مورد مطالعه و ارزیابی قرار گیرد. در این پژوهش تأثیر پارامترهای عرض پله (فاصله افقی پله‌ها) و تعداد پله ً ها بر عملکرد دیوار پله‌ای نسبت به دیوار قائم مورد بررسی قرار گرفته است. در این راستا جمعا 12 مدل دیوار در مقیاس آزمایشگاهی ساخته شد و عملکرد آنها تحت بارگذاری استاتیکی مورد ارزیابی قرار گرفت. نتایج نشان داد که در دیوار پله‌ای با افزایش عرض پله و افزایش تعداد پله‌ها تغییرشکل‌های افقی رویه دیوار و نشست پی نواری مستقر بر خاک بالادست دیوار، نسبت به دیوار قائم کاهش و ظرفیت باربری پی نواری افزایش می‌یابد. با افزایش عرض پله، تغییر مکان افقی رویه دیوار به‌ خصوص در قسمت بالایی دیوار به طور قابل توجهی کاهش می‌یابد؛ به‌طوری که مناسب‌ترین حالت برای اندرکنش دیوار بالایی و پایینی از لحاظ عملکرد در حالت خاص چهار لایه تسلیح و دیوار یک پله‌ای، برای شرایط نسبت عرض پله به ارتفاع دیوار برابر 0/35 می‌باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental Study on Performance of Multi-Tiered Reinforced Soil Retaining Walls

نویسندگان [English]

  • Abas Abedi 1
  • Jahangir Khazaei 2
  • hossein moayedi 3
1 Civil Engineering Department, Razi University, Kermanshah, Iran
2 civil engineering, razi university, kermanshah, iran
3 Civil Engineering Department, Kermanshah University of Technology
چکیده [English]

In reinforced soil walls, if the wall divided into several sections (here called tiers) it can be called multi-tiered reinforced soil retaining walls (MRSRW). These walls are considered to be a good solution especially if the wall’s height need to increase. The main objective of the study was finding the effects of tiers horizontal distance, offset distance between adjacent tiers and number of tiers on the lateral deflection of the wall facing as well as ultimate bearing capacities of a strip footing located at top of the wall. In this study, a small scale experimental programme on MRSRW were carried out where a total of 12 experiments were performed under static loading condition. The results showed that by increasing the tiers’ width and number of tiers in MRSRW, the horizontal deflection and settlement of footing on the crest of the wall was considerably reduced. Besides, when the tires’ width increased, the lateral deflection along the wall height was significantly reduced, especially at top of the wall. The result indicated that in order to attain the highest interaction between the top and bottom sections of the MRSRWs, having four reinforcement layers and one tier (with tier’s width/wall’s height ratio equal to 0.35) can provide the best result in regard to both lowest lateral deflection and highest bearing capacity of footing installed at top of the wall.

کلیدواژه‌ها [English]

  • Geogrid
  • Reinforced soil
  • Retaining walls
  • Multi-tiered configuration
  • offset distance
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