نویسنده
دانشکده مهندسی عمران، دانشگاه فردوسی مشهد، مشهد
چکیده
وابستگی سختی به سطح تنش، رفتار سخت شوندگی و اتساعی، همچنین خردشدگی، چرخش و بازتوزیع اندازه ذرات مهم‌ترین ویژگی‌ها و پدیده‌های تغییر شکلی مصالح سنگریزه‌ای هستند. ورمر و دبورست مدلی الاستوپلاستیک برای شبیه‌سازی رفتار برشی خاک، بتن و سنگ پیشنهاد داده‌اند. این مقاله درصدد آن است که مدل مذکور را به شیوه‌ای ارتقاء دهد تا قابلیت شبیه‌سازی رفتار برشی مصالح سنگریزه‌ای را داشته باشد. ارتقاء مدل به‌واسطه پیشنهاد توابع زاویه اتساع و اصطکاک بسیج شده جدید و نیز روابط جدیدی برای بعضی پارامترهای مدل صورت گرفته است. برای اعتبارسنجی، آزمایش‌های سه محوری بزرگ مقیاس انجام شده روی مصالح سنگریزه‌ای پوسته سد مسجد سلیمان با مدل ارتقاء یافته شبیه‌سازی شده است. نتایج مطالعه نشان می‌دهد مدل ورمر- دبورست ارتقاء یافته دقت بسیار مناسبی در شبیه‌سازی عددی رفتار برشی مصالح سنگریزه‌ای دارد.
کلیدواژه‌ها
عنوان مقاله [English]
An Improvement of Vermeer-de Borst Constitutive Model for Numerical Simulation of the Shear Behavior of Rockfills
نویسنده [English]
- M. Salari
چکیده [English]
The most important features and phenomena of the deformation behavior of rockfills are stress-dependent stiffness, hardening and dilative (or contractive) behaviors, as well as breakage, rotation and redistribution of particle size. An elasto-plastic constitutive model has been suggested by Vermeer and de Borst to simulate the shear behavior of soils, concretes and rocks. This research has tried to improve this model for numerical simulation of the shear behavior of rock fills. The improvement of the model has been performed through proposing new mobilized dilation and friction angles functions and new relationships for some parameters. For validation, a series of large-scale triaxial tests performed on the rockfill shell of Masjed-e-Soleyman dam have been simulated with the improved model. The results show that the improved Vermeer-De Borst model has a good accuracy to simulate the shear behavior of rockfills numerically.
کلیدواژه‌ها [English]
- Rockfill material
- Constitutive model
- Particle breakage
- Dilative behavior
- Hardening behavior
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