پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

مقایسه رفتار سیکلی و مونوتونیک پساسیکلی بالاست سرباره‌ فولاد و بالاست سنگ آهکی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشیار، مرکز تحقیقات راه، مسکن و شهرسازی، تهران، ایران
2 دانش آموخته کارشناسی ارشد، دانشکده مهندسی عمران، دانشگاه یزد، یزد، ایران
3 استادیار، دانشکده مهندسی عمران، دانشگاه یزد، یزد، ایران
چکیده
بالاست به‌عنوان یکی از اجزای اصلی خطوط ریلی بالاستی معمولاً از سنگ طبیعی شکسته تهیه می‌شود. احداث خطوط بالاستی جدید و عملیات تعمیر و نگهداری خطوط ریلی موجود، نیاز  به بالاست را افزایش می‌دهد. بنابراین یافتن مصالح جایگزین برای بالاست سنگی به حفاظت از محیط زیست کمک خواهد کرد. سرباره فولاد، به‌عنوان یک محصول جانبی در فرآیند تولید فولاد، یکی از جایگزین.‌های بالاست سنگ طبیعی است. در این مطالعه با استفاده از آزمایش سه‌محوری بزرگ مقیاس، رفتار بالاست سرباره فولاد  با بالاست سنگ آهکی مقایسه شده‌است. نتایج نشان می‌دهد که بالاست آهکی مدول برشی و مدول برجهندگی بالاتری دارد. سرعت و بارمحوری مجاز برایخطوط با بالاست سرباره بیشتر از بالاست آهکی است. تنش سیکلی مجاز و کرنش آستانه تغییرشکل‌های پیشرونده برای بالاست سرباره به‌ترتیب 200 کیلوپاسکال و 025/0 درصد است که این مقادیر برای بالاست آهکی به‌ترتیب در حدود 160 کیلوپاسکال و 02/0 درصد است. بالاست سرباره تنش استاتیکی تفاضلی بیشینه و زاویه اصطکاک بالاتری در مقایسه با بالاست آهکی دارد. سنگدانه‌های بالاست سرباره همچنین مقاومت در برابر سایش و شکست بالاتری نسبت به بالاست آهکی نتیجه داد.
کلیدواژه‌ها

عنوان مقاله English

Comparison of Cyclic and Post-Cyclic Monotonic Behavior of Steel Slag Ballast and Limestone Ballast

نویسندگان English

Ata Aghaei Araei 1
Bahareh Ebrahimi Alavijehb 2
Maryam Mokhtari 3
1 Associate Professor, Road, Housing and Urban Development Research Center, Tehran, Iran.
2 M.Sc., Grad., Department of Civil Engineering, Yazd University, Yazd, Iran.
3 Assistant Professor, Department of Civil Engineering, Yazd University, Yazd, Iran.
چکیده English

The ballast layer is one of the most important components of the ballasted track, which is composed of natural crushed rock materials. The construction of new ballasted tracks and maintenance operations of existing railway tracks increase the need for ballast. Therefore, finding alternative materials for rock ballast would be essential for the protection of the environment. Steel slag, as a by-product of the steel production process, is one of the alternative materials to natural rock ballast. In this study, the behavior of steel slag ballast has been compared with limestone ballast, using large-scale triaxial tests. The results show that limestone ballast has a higher shear modulus and resilient modulus. The allowable speed and axial load for ballasted tracks with slag ballast is higher than that of limestone ballast. The allowable cyclic stress and threshold strain of progressive deformations for slag ballast are about 200 kPa and 0.025%, respectively, and these values ​​are about 160 kPa and 0.02% for limestone ballast, respectively. Slag ballast has a higher maximum static deviator stress and a higher friction angle compared to limestone ballast. Slag aggregates also resulted in higher abrasion and breakage resistance than limestone aggregates.

کلیدواژه‌ها English

Slag Ballast
Limestone Ballast
Large-Scale Triaxial Test
Cyclic Behavior
Post-Cyclic Monotonic Behavior
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