تحلیل رفتار روسازی بتنی بلوکی سطوح پروازی با استفاده از آزمایشPLT و CBR

نوع مقاله : مقاله پژوهشی

نویسندگان

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

2 گروه مهندسی عمران ، واحد سمنان ، دانشگاه آزاد اسلامی ، سمنان ، ایران

چکیده

در توقفگاه های هواپیما (اپرون) که بارگذاری عمدتا" از نوع ایستایی است، از روسازی بتنی استفاده میشود. مشکلی که این نوع روسازی دارد هزینه زیاد تعمیرو نگهداری و بروز اختلال در ترافیک هواپیماها در زمان انجام تعمیرات است. به همین دلیل میتوان از روسازی بتنی بلوکی با مزیت هایی مانند اجرا و ترمیم آسان بدون نیاز به عمل آوری استفاده نمود. یکی از چالش های طراحی روسازی بتنی بلوکی میزان تاثیر CBR خاک بستر در پایداری آن در مقابل تغییر شکل های ماندگار است. به همین منظور در این تحقیق ، اقدام به مدلسازی با نرم افزار آباکوس و اجرای یک نمونه به مساحت 4 متر مربع، مطابق ضوابط سازمان هوانوردی فدرال و انجام بارگذاری صفحه(PLT) گردید. این مدل شامل لایه های خاک بستر، زیر اساس، اساس، اساس سیمانی و بلوک های بتنی 8 سانتیمتری بود. تحلیل حساسیت نشان داد با افزایش CBR خاک بستر از 2 به 10تغییر مکان قائم بیش از 12% و با CBR های 10 و بالاتر ، کمتر از 4% کاهش می یابد. نتیجه آن که به دلیل وجود اساس سیمانی استفاده از خاک بستر متراکم با CBR بیشتر از 10 تاثیر چندانی در افزایش مقاومت این نوع روسازی در برابر تغییر شکل قائم ندارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Analysis of Airfield Concrete Block Pavement Behavior Using PLT and CBR Tests

نویسندگان [English]

  • parham hayati 1
  • vahid taheri 2
1 Department of Civil Engineering, Science and research Branch, Islamic Azad University, Tehran.Iran
2 Department of Civil Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran
چکیده [English]

Concrete pavement is used in the aprons owing to its resistance to static loads as the main loads of aircraft. Its main problem is costly and flight-disrupting repairs. An alternative is to use interlocking concrete block pavement with advantages such as simple execution and repair and with no needs for curing. There is concern about the effect of subgrade CBR on the resistance of block pavers to permanent deformation. The present study was conducted to investigate the effect of subgrade CBR on these pavements in the apron. PLT were first performed on a 2m×2m prototype constructed as per Federal Aviation Administration (FAA) regulations. The layers of this 3D model include compacted subgrade, sub-base, crushed aggregate base and cement-treated base (CTB) and 8-cm thick concrete blocks. Sensitivity analysis showed a reduction of over 12% in vertical deflection with increasing CBR from 2 to 10 and a reduction of below 4% in the presence of subgrade even with CBR=10~20%, Due to the adjustment of the role of the CTB in front of the subgrade, it is more resistant. Using subgrade with CBR of over 10 was found to insignificantly increase the resistance of block pavements to permanent deformation. Concern about the risk of permanent deformation is largely obliterated given the key role of the cement-treated base in redistributing the loads.

کلیدواژه‌ها [English]

  • Airfield Concrete Block Pavement
  • Apron
  • Cement Treated Base(CTB)
  • CBR
  • Plate Loading Test(PLT)

مراجع

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سابقه مقاله

  • تاریخ دریافت: 13 تیر 1401
  • تاریخ بازنگری: 20 آبان 1401
  • تاریخ پذیرش: 03 دی 1401
  • تاریخ اولین انتشار: 03 دی 1401

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