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شبیهسازی رفتار تراکم خاک زراعی با روش اجزاء محدود و تکنیک پردازش تصویر | ||
| مهندسی بیوسیستم ایران | ||
| دوره 53، شماره 2، تیر 1401، صفحه 141-154 اصل مقاله (1.27 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ijbse.2022.332682.665447 | ||
| نویسندگان | ||
| مجتبی جابری معز* 1؛ دنیا اکبری2 | ||
| 1گروه مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه بوعلی سینا، همدان، ایران | ||
| 2فارغ التحصیل کارشناسی ارشد، گروه مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه بوعلی سینا، همدان، ایران | ||
| چکیده | ||
| چکیده: تراکم خاک به فرآیندی که سبب افزایش چگالی ظاهری، کاهش حجم و پیوستگی منافذ، کاهش نفوذپذیری آبی و هوایی خاک و افزایش مقاومت مکانیکی میگردد، اطلاق میشود. یکی از پارامترهای مهم ارزیابی تراکم خاک، تنش پیش-تراکمی میباشد که اغلب به عنوان تنش در آستانه تراکم خاک، محسوب میشود. آزمون نشست صفحهای روشی مناسب برای تعیین تنش پیش تراکمی خاک میباشد. در این تحقیق، آزمون تجربی نشست صفحهای، روی یک نمونه خاک زراعی (شنی رسی لومی) در سطح محتوای رطوبتی 15 درصد بر پایه خشک و چگالی 1500 کیلوگرم بر مترمکعب انجام شد و خواص مکانیکی خاک تعیین شدند. سپس آزمون نشست صفحهای به روش اجزاء محدود به‌صورت دو بعدی و متقارن در نرمافزار آباکوس شبیهسازی و تنش پیشتراکمی با این روش نیز پیشبینی شد. همچنین میزان تغییرات تنش و جابجایی در لایههای عرضی و عمقی خاک زراعی تجزیه و تحلیل شدند. بین دادههای استخراج شده از مدل شبیهسازی و دادههای تجربی تطابق بالایی بین آن‌ها وجود داشت (R2 =0.99). 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 پیشروی به سمت لایههای زیرین از مقدار تنش و جابجایی کاسته میشود. همچنین، در این پژوهش، از تکنیک پردازش تصویر نرمافزار متلب[1] به عنوان روشی برای تخمین میزان تراکم خاک استفاده شد. بهعنوان نتیجهگیری کلی، میتوان از هر دو روش اجزاء محدود و پردازش تصویر برای تشخیص ناحیه فشرده شده خاک استفاده نمود. [1] MATLAB | ||
| کلیدواژه‌ها | ||
| تنش پیشتراکمی؛ توزیع تنش؛ مدل دراکر-پراگر؛ نشست صفحهای | ||
| عنوان مقاله [English] | ||
| Simulation of Arable Soil Compaction Behavior by Finite Element Method and Image Processing Technique | ||
| نویسندگان [English] | ||
| mojtaba jaberimoeaz1؛ donya akbari2 | ||
| 1Department of Biosystems Engineering, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran. | ||
| 2Graduate Student, Department of Biosystems Engineering, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran | ||
| چکیده [English] | ||
| ABSTRACT: Soil compaction refers to process that increases density, decreases volume and continuity of pores, decreases water and air permeability, and increases mechanical strength. One of important parameters for evaluation of soil compaction is pre-compaction stress, which is often considered as stress at threshold of soil compaction. Plate sinkage test is an appropriate method for determining soil pre-compaction stress. In this research, for determining pre-compaction stress the experimental test of plate sinkage was used on a sample of arable soil (sandy clay loam) at the level of 15% moisture content based on dryness and density 1500 kg.m-3. Then mechanical properties of soil was determined. Plate sinkage test was simulated as the form of two-dimensional and symmetric in Abaqus software and the pre-compression stress was also predicted by this method. Also, the amount of stress and displacement changes in the transverse and longitudinal layers of arable soil were analyzed. There was a high correlation (R2 =0.99) between the data extracted from the simulation model and the experimental data. Examination of compressive stress and displacement in different layers in the soil depth showed that the amount of stress and displacement in layers close to load level is more and decreases amount of stress and displacement as it progresses to the lower layers. Also, in this research, image processing technique by MATLAB software has been applied as a method to estimate soil compaction. As a general conclusion, the finite element method and image processing can be used for assessment of compacted region of soil. | ||
| کلیدواژه‌ها [English] | ||
| pre-compression stress, Stress distribution, Drucker–Prager, plate sinkage | ||
| مراجع | ||
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