مطالعه‌ی عددی عملکرد شمع‌های حرارتی بااستفاده از مدل‌های رفتاری ترمومکانیکی و مکانیکی

نوع مقاله : پژوهشی

نویسندگان

1 گروه مهندسی عمران، دانشگاه قم.

2 دانشگاه علم و صنعت نروژ

چکیده

در سال‌های اخیر مدل‌های رفتاری متعددی برای پیش‌بینی رفتار خاک تحت اثر بارهای ترمومکانیکی ارائه شده‌است. از سوی دیگر بررسی رفتار شمع‌های حرارتی و خاک مجاور آن تحت بارهای ترمومکانیکی و بااستفاده از مدل‌های رفتاری که در آنها تغییر رفتار خاک در اثر تغییرات دما درنظر گرفته می‌شود، از اهمیت زیادی برخوردار است. در این تحقیق یک مدل رفتاری ترمومکانیکی به نرم‌افزار المان محدود آباکوس اضافه شده‌است تا از آن برای بررسی عملکرد شمع‌های حرارتی، استفاده شود. نتایج به‌دست‌آمده از مدل‌سازی عددی آزمایش سه‌محوری نشان می‌دهد که کد نوشته‌شده برای مدل رفتاری مورد نظر توانایی پیش‌بینی رفتار خاک در شرایط ترمومکانیکی را دارد. هم‌چنین نتایج به‌دست‌آمده از تحلیل شمع حرارتی بااستفاده از مدل‌های رفتاری مکانیکی دراکر-پراگر، کم‌کلی اصلاح شده و ترمومکانیکی تورچی بیانگر آن است که با‌وجود تأثیر قابل‌توجه انتخاب مدل رفتاری بر نتایج در تحلیل شمع حرارتی، تفاوتی میان انتخاب مدل رفتاری مکانیکی و ترمومکانیکی برای خاک کنار آن وجود ندارد.

کلیدواژه‌ها

عنوان مقاله [English]

The Numerical Study of Energy Piles Performance by Using of Thermo-Mechanical and Mechanical Constitutive Models

نویسندگان [English]

  • Ali Jamallo 1
  • mehdi Khodaparast 1
  • S. Ali Ghoreishian Amiri 2
1 Civil Engineering Department, university f Qom, Qom, Iran.
2 Department of Civil and Environmental Engineering, Faculty of Engineering, Norwegian University of Science and Technology, Trondheim, Norway.
چکیده [English]

In recent years, several constitutive­ models have been proposed to predict soil behavior under thermomechanical loads. On the other hand, it is important to study the behavior of energy piles and their adjacent soils under thermomechanical loads and by using constitutive models in which soil behavior changes due to temperature changes are considered. In this study, a thermomechanical constitutive model was added to the Abaqus finite element software to be used to evaluate the performance of energy piles. Results obtained from numerical modeling of Triaxial test show that the code written for the given constitutive model is capable of predicting soil behavior under thermomechanical conditions. Also, the results obtained from the analysis of energy pile using mechanical constitutive models of Drucker-Prager, MCC and thermo-mechanical constitutive model Tourchi show that in the analysis of energy pile, although the choice of constitutive model has a significant impact on the results, but there is no difference between choosing a mechanical or thermomechanical constitutive model for the adjacent soil.

کلیدواژه‌ها [English]

  • Energy pile
  • Constitutive model of soil
  • Thermomechanic
  • Temperature effect on soil
  • Abaqus

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