شبیه‌سازی خاک کشاورزی طی آزمون نشست صفحه‌ای توسط معیار تسلیم دراکر پراگر با استفاده از روش اجزاء ‌‌محدود

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه بوعلی سینا، همدان، ایران

چکیده

افزایش تراکم خاک یکی از تهدیدات اصلی برای تخریب ساختمان خاک است که حتی ممکن است منجر به تجزیه خاک نیز شود. به‌منظور جلوگیری از پدیده افزایش تراکم خاک، دانستن ویژگی‌های مکانیکی خاک در تعیین حدود تنش مجاز حائز اهمیت است. تنش پیش‌تراکمی، به عنوان حداکثر تنشی که خاک می‌تواند تحمل کند بدون اینکه فشردگی آن افزایش یابد، یکی از مهم‌ترین مشخصات مکانیکی خاک است. آزمون نشست صفحه‌ای، روشی مناسب برای تعیین تنش پیش تراکمی خاکاست. در این تحقیق، آزمون تجربی نشست صفحه‌ای، روی یک نمونه خاک زراعی (شنی رسی لومی) در سطح محتوای رطوبتیd.b.  15% با چگالیkg. m-31500 انجام شد و خواص مکانیکی خاک تعیین شدند. سپس آزمون نشست صفحه‌ای به روش اجزاء‌محدود به‌صورت دوبعدی و متقارن توسط مدل دراکر-پراگر در نرم‌افزار آباکوس شبیه‌سازی و تنش پیش‌تراکمی با این روش پیش‌بینی شد. همچنین توزیع تنش و جابجایی در لایه‌های خاک در عمق تجزیه‌وتحلیل شدند. نتایج نشان داد که مدل دراکر-پراگر با ضریب تبیین 99% مطابقت خوبی با داده‌های به‌دست‌آمده از آزمایش تجربی داشت. بررسی توزیع تنش فشاری و جابجایی در لایه‌های مختلف در عمق خاک ‌نشان داد که مقدار تنش و جابجایی در لایه‌های نزدیک به سطح بارگذاری بیشتر و با حرکت به سمت لایه‌های پایین‌تر مقدار تنش و جابجایی کاهش یافت.

کلیدواژه‌ها


عنوان مقاله [English]

Agricultural Soil Simulation during Plate Displacement Test Using Finite Element Method and Drucker-Prager Model

نویسندگان [English]

  • Mojtaba Jaberi Moaz
  • Donia Akbari
  • Maryam Beglari
Department of Bio-System Engineering, Faculty of Agriculture, University of Bu-Ali Sina, Hamadan, Iran
چکیده [English]

Soil compaction increase is one of the main threats to agricultural soil structure, which may even lead to soil decomposition. In order to prevent the phenomenon of soil compaction, knowing the mechanical properties of soil is important in the determination of the allowable stress limits. Pre-compaction stress, as the maximum stress that soil can withstand without increasing its compaction, is one of the most important mechanical properties of soil. The plate sinkage test is a suitable method for determining the soil pre-compaction stress. In this research, the experimental test of plate deposition on a sample of arable soil (loamy sandy loam) at the moisture content of 15% d.b. with density of 1500 kg.m3 was performed and the soil mechanical properties were determined. Then, the plate sitting test was performed in twodimensional and symmetrical methods by finite element method and Drucker Prager model in Abaqus software and precompression stress was predicted by this method. Stress distribution and displacement in the soil depth layers were also analyzed. The results showed that the Drucker-Prager model with a 99% explanation coefficient was in good agreement with the data obtained from the experiments. Examination of compressive stress and displacement in different layers in the soil depth showed that the amount of stress and displacement in the layers close to the load surface was higher than that for the lower layers.  

کلیدواژه‌ها [English]

  • Drucker-Prager
  • Plate sinkage test
  • Pre-compression stress
  • Soil compaction
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