نشریه ژئومکانیک و ژئوانرژی

نشریه ژئومکانیک و ژئوانرژی

ارائه یک مدل رفتاری الاستو-ترمو-ویسکوپلاستیک برای پیش‌بینی رفتار زیرساخت‌های مدفون زیرزمینی در رس دارای ساختار

نوع مقاله : مقاله پژوهشی

نویسندگان
امیر حمیدی
فرهاد عاصمی
توحید تاجیک
گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه خوارزمی، کرج، ایران
10.22107/ggj.2025.525202.1253
چکیده
در بسیاری از کاربردهای ژئوتکنیکی، لایه‌های خاک رس دارای ساختار، ممکن است در معرض بارگذاری طولانی مدت و تغییرات دما قرار گیرند. بنابراین سه عامل دما، خزش و ساختار بر رفتار سازه‌های مورد احداث در این خاک‌ها موثر خواهند بود. بررسی متون فنی نشان می‌دهد که اغلب مدلهای رفتاری موجود قادر هستند تنها به صورت جداگانه تأثیر ساختار، تغییرشکل‌های خزشی و تغییرات دما یا به صورت توأمان اثر دو پدیده از این سه پدیده را در نظر بگیرند. در پژوهش حاضر، پس از مرور مطالعات گذشته در ارتباط با اثر دما و خزش بر رفتار ترمومکانیکی خاکهای رس دارای ساختار، یک مدل رفتاری جدید برای در نظر گرفتن همزمان هر سه عامل ارائه شده است. بر این اساس در ابتدا، تغییرات هر یک از سه پارامتر در صفحه تراکم e-lnp^' به طور جداگانه مورد ارزیابی قرار گرفته و در ادامه اثرات این سه فاکتور برای ارائه فرمولاسیون نهایی مدل با هم ترکیب شده است. روش مشابه توسط Hamidi, 2020 مبتنی بر حالت حدی خاک برای در نظر گرفتن اثر سه فاکتور دما، زمان و ساختار جهت بررسی رفتار خاک حین اعمال فشار ایزوتروپ خاک در نظر گرفته شده است. در این تحقیق، این سه فاکتور برای تبیین رفتار برشی رس‌ها مورد بررسی قرار گرفته است. در این تحقیق، سعی شده که از کمترین تعداد پارامترهای ممکن در مقایسه با مدل Modified Cam-Clay (MCC) استفاده شود و اطمینان حاصل گردد که پارامترهای جدید تفسیرهای فیزیکی یا مکانیکی واضحی دارند. نتایج تحقیق حاضر، درک جامع‌تری از رفتار پیچیده حاکم بر پاسخ مکانیکی رس‌های دارای ساختار، تحت شرایط محیطی و بارگذاری متغیر ارائه می‌دهد.
کلیدواژه‌ها
مدل رفتاری الاستو-ترمو-ویسکوپلاستیک
رفتار برشی
خزش
رس دارای ساختار
سازه‌های زیرزمینی مدفون

عنوان مقاله English

An Elasto-Thermo-Viscoplastic Constitutive Model for Predicting the Behavior of Buried Underground Infrastructures in Structured Clays

نویسندگان English

Amir Hamidi
Farhad Asemi
Tohid Tajik
Department of Civil Engineering, School of Engineering, Kharazmi University, Tehran, Iran
چکیده English

In numerous geotechnical applications, structured clay layers are often exposed to prolonged loading conditions and temperature variations. A comprehensive review of the technical literature indicates that most existing constitutive models tend to address the effects of structural characteristics, creep deformations, and temperature variations either independently or, in some cases, by considering only two of these factors in combination. However, there remains a significant gap in models that integrate all three phenomena simultaneously. This study aims to bridge this gap by proposing a novel constitutive model that incorporates the combined effects of structure, creep, and temperature on the thermo-mechanical behavior of structured clays. The development of this model begins with a detailed evaluation of the individual impacts of each phenomenon within the e-lnp^' consolidation plane. These individual contributions are then systematically integrated into a unified model formulation. While previous studies, such as the work by Hamidi (2020), employed a similar methodology based on the critical state soil model to analyze the combined effects of temperature, time, and structure on isotropic compression behavior, the present research extends this approach by focusing on the influence of these three factors on the shear behavior of structured clays. In this study, an effort has been made to ensure that the new parameters have obvious physical or mechanical interpretations and to use the least additional parameters compared to the Modified Cam-Clay (MCC) model. This advancement provides a more comprehensive understanding of the complex interactions governing the mechanical response of structured clays under varying environmental and loading conditions.

کلیدواژه‌ها English

Elasto-thermo-viscoplastic constitutive model
shear behavior
creep
structured clay
buried underground structures
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نشریه ژئومکانیک و ژئوانرژی
دوره 8، شماره 1
بهار 1404
صفحه 57-66