نشریه علمی-پژوهشی مکانیک سنگ

نشریه علمی-پژوهشی مکانیک سنگ

مدلسازی رفتار خاک یخ‌زده در چرخه‌های انجماد/ذوب با تأکید بر پارامترهای عمق و نرخ تغییرات دما

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشگاه تربیت مدرس، تهران، ایران
2 دانشکده فنی و مهندسی، دانشگاه تربیت مدرس، تهران، ایران
چکیده
مطالعه حاضر به بررسی رفتار مکانیکی خاک‌های یخ‌زده تحت تأثیر چرخه‌های متناوب انجماد/ذوب با استفاده از مدل رفتاری قریشیان امیری (2016) پرداخته است. این تحقیق با به کارگیری روش اجزای محدود در نرم‌افزار پلکسیس، تأثیر پارامترهای کلیدی شامل عمق نمونه و نرخ تغییرات دمایی را بر پاسخ حجمی خاک مورد تحلیل قرار داده است. نتایج نشان می‌دهد که خاک در طول چرخه‌های حرارتی از الگوی رفتاری پیچیده‌ای پیروی می‌کند که شامل فازهای انقباض الاستیک اولیه، تورم ناشی از تفکیک یخ و تحکیم پلاستیک در مرحله ذوب می‌باشد. بررسی‌ها حاکی از آن است که لایه‌های سطحی در مقایسه با عمق میانی، تغییرات کرنشی شدیدتری را تجربه می‌کنند و افزایش زمان چرخه‌های حرارتی منجر به کاهش دامنه بالازدگی و افزایش نشست باقی‌مانده می‌گردد. مدل مورد استفاده که بر اساس تئوری تنش فاز جامد و مکش برودتی توسعه یافته است، توانسته رفتار غیرخطی خاک را تحت شرایط مختلف دمایی به خوبی شبیه‌سازی نماید. یافته‌های این تحقیق می‌تواند مبنای مناسبی برای طراحی‌های ژئوتکنیکی در مناطق سردسیر و همچنین توسعه مدل‌های عددی آینده فراهم آورد. نتایج به دست آمده اهمیت در نظر گرفتن اثرات عمق و نرخ تغییرات دما را در ارزیابی پایداری سازه‌های احداث شده بر روی خاک‌های مستعد انجماد مورد تأکید قرار می‌دهد.
کلیدواژه‌ها

موضوعات


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