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بررسی آرایش دانهها در رفتار مصالح دانهای ترد تحت بارگذاری تکمحوری فشاری با روش المان گسسته | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 5، دوره 54، شماره 11، بهمن 1401، صفحه 4139-4162 اصل مقاله (2.03 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2022.20011.7314 | ||
| نویسندگان | ||
| وحید قربانپور؛ مهرداد امامی تبریزی* | ||
| دانشکده مهندسی عمران و مرکز تحقیقات زلزله، دانشگاه صنعتی سهند، تبریز، ایران | ||
| چکیده | ||
| مصالح دانهای در بسیاری از پروژهها همچون سدها، خطوط راهآهن و موجشکنها مورد استفاده قرار میگیرند. چون ابعاد مصالح دانهای در این پروژهها از چند سانتیمتر شروع و گاهی به یک متر نیز میرسد، لذا انجام آزمایشهای آزمایشگاهی بسیار پرهزینه، زمانبر و حتی غیرممکن میگردد. بدین منظور، استفاده از مدلسازی عددی برای بررسی تأثیر پارامترهای مختلف بر رفتار مکانیکی این نوع مصالح بسیار حائز اهمیت میباشد. از میان عوامل مؤثر، عامل آرایش دانهها در این تحقیق بررسی میشود. بدین منظور، دانههای استوانهای و مکعبی شکل به عنوان نماینده دانههای گردگوشه و تیزگوشه، در دو وضعیت آرایش منظّم و نامنظّم به روش المان گسسته مدلسازی شده و رفتار تنش-کرنش، انرژی اعمالی و مقادیر شکست بعد از بارگذاری، بررسی میگردند. استفاده از مدل غیرخطی هرتز و تعیین پارامترهای آن بر اساس آزمایشهای آزمایشگاهی، کنترل یکنواختی توزیع دانهها بر اساس تعداد نقاط تماس به همراه شیب و راستای قراگیری دانهها، تعریف معیار شکست بر اساس معیار فونمیزز و اعمال الگوی شکست بر اساس دونیم شدن دانهها از جمله ویژگیهای مدل به کار رفته میباشند. به منظور صحتسنجی مدل عددی، آزمایشهای آزمایشگاهی مشابه نیز صورت گرفته و نتایج آنها با یکدیگر مقایسه شدند. نتایج حاصله حاکی از آن میباشد که مدل عددی میتواند با دقت بالایی، تأثیر نحوه قرارگیری دانهها را بر رفتار مصالح بررسی نماید. همچنین با توجه به وجود اشکال مختلف در مصالح دانهای، نقش آرایش ترکیبی با شکلهای مختلف دانهها نیز بر روی نتایج حاصله مورد بررسی قرار گرفت. | ||
| کلیدواژهها | ||
| آرایش دانهها؛ رفتار مصالح؛ روش المان گسسته؛ معیار فون میزز؛ مدل غیرخطی هرتز | ||
| موضوعات | ||
| روش های عددی؛ مکانیک خاک و پی | ||
| عنوان مقاله [English] | ||
| DEM investigation of the effect of arrangement of grains on the behavior of brittle granular materials subjected to one dimensional compression | ||
| نویسندگان [English] | ||
| Vahid Gorbanpoor؛ Mehrdad EMAMI Tabrizi | ||
| Civil Engineering Faculty, Sahand University of Technology | ||
| چکیده [English] | ||
| Granular materials are used in many projects such as dams, railways and breakwaters. Because the size of granular materials in these projects starts from a few centimeters and sometimes reaches one meter, conducting laboratory experiments would be very expensive, time-consuming and even impossible. For this purpose, the use of numerical modeling to investigate the effect of different parameters on the mechanical behavior of this type of material is very important. Among the effective factors, grain arrangement is investigated in this study. Thus, cylindrical and cubic grains are modeled as representative of rounded and angular grains, in two regular and irregular arrangement based on the discrete element method and stress-strain behavior, applied energy and breakage values after loading are investigated. Using the non-linear Hertz model and determining its parameters based on laboratory experiments, controlling the uniformity of grain distribution based on the number of contact points along with the dip and direction of grains, defining the breakage criterion based on Von-Mises criterion and applying the breakage pattern based on particle splitting are among the features of the model used. In order to validate the numerical model, similar laboratory experiments were performed and their results were compared with each other. The results showed that the numerical model can study the effect of the arrangement of grains on the behavior of materials with high accuracy. Also, due to the existence of different shapes in granular materials, the effect of mixed arrangement was investigated on the results. | ||
| کلیدواژهها [English] | ||
| Grain arrangement, Behavior of materials, Discrete element method, Von-Mises criterion, Non-linear Hertz model | ||
| مراجع | ||
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