پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

بررسی رفتار دینامیکی و نشست خاک‌های ریزدانه تثبیت‌شده با سیمان تحت بارگذاری قطارهای سریع‌السیر: مدل‌سازی اجزای محدود و ارزیابی آزمایشگاهی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 استادیار، گروه مهندسی عمران، دانشگاه ملی مهارت، تهران، ایران
2 استاد، دانشگاه SDU آلماتی، قزاقستان
چکیده
توسعه خطوط راه‌آهن سریع‌السیر به‌عنوان یکی از ارکان حمل‌ونقل پایدار، مستلزم شناخت دقیق رفتار ژئوتکنیکی بستر تحت بارهای دینامیکی ناشی از عبور قطار است. در مسیر پیشنهادی راه‌آهن سریع‌السیر اصفهان–تهران، بخش‌هایی از مسیر بر روی خاک‌های ریزدانه قرار دارد که به دلیل تراکم‌پذیری، تغییرشکل‌پذیری و حساسیت به بارگذاری‌های تکراری، می‌توانند عملکرد و ایمنی خط را تحت تأثیر قرار دهند. ازاین‌رو، ارزیابی رفتار دینامیکی این خاک‌ها و بررسی روش‌های بهسازی آن‌ها برای طراحی و بهره‌برداری ایمن ضروری است. هدف این پژوهش، بررسی اثر سرعت قطار بر نشست و پاسخ دینامیکی خاکریز احداث‌شده بر روی خاک‌های ریزدانه مسیر اصفهان–تهران و ارزیابی کارایی تثبیت سیمانی بستر است. بدین منظور، مدل‌سازی عددی سیستم خاکریز–بستر با روش اجزای محدود در نرم‌افزار PLAXIS 2D انجام و نتایج آن با داده‌های آزمایشگاهی اعتبارسنجی شد. سپس، تحلیل حساسیت پارامترهای مؤثر شامل سرعت قطار، نسبت آب به سیمان، ... و ضخامت خاکریز بر میزان نشست و ارتعاشات بستر انجام گرفت. نتایج عددی و آزمایشگاهی نشان داد که تثبیت سیمانی خاک‌های ریزدانه موجب کاهش تغییرشکل‌های قائم و بهبود عملکرد دینامیکی بستر نسبت به حالت بهسازی‌نشده می‌شود. همچنین، نسبت آب به سیمان، نسبت ماسه به سیمان و ضخامت خاکریز از مهم‌ترین عوامل مؤثر بر نشست و پاسخ ارتعاشی بستر هستند. بررسی اثر سرعت قطار نیز نشان داد که در محدوده سرعت‌های مطالعه‌شده، افزایش سرعت به‌تنهایی رابطه خطی با افزایش نشست ندارد و پاسخ بستر حاصل برهم‌کنش سرعت قطار، ویژگی‌های ژئوتکنیکی خاک و مشخصات لایه بهسازی‌شده است. این یافته‌ها می‌تواند مبنایی برای طراحی و بهینه‌سازی بستر خطوط راه‌آهن سریع‌السیر در خاک‌های ریزدانه، به‌ویژه در مسیر اصفهان–تهران (محدوده وزوان–میمه–قرقچی)، فراهم کند.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Dynamic response and settlement behavior of cement-stabilized fine-grained subgrades under high-speed rail loading: A finite element and experimental investigation

نویسندگان English

Hoseinali Bagi 1
Ali Rahimi 2
1 Assistant Professor, Civil Department, Technical and Vocational University, Tehran, Iran.
2 Professor, Engineering Department, SDU. Almaty, Kasakhastan.
چکیده English

This study investigates the influence of train speed on the settlement and dynamic response of an embankment constructed over fine-grained soils while evaluating the effectiveness of cement stabilization as a ground improvement method. A two-dimensional finite element model of the embankment–subgrade system was developed using PLAXIS 2D and validated against laboratory test results. A parametric sensitivity analysis was then conducted to examine the effects of train speed, water-to-cement ratio, sand-to-cement ratio, and embankment thickness on subgrade settlement and vibration response The results demonstrate that cement stabilization significantly reduces vertical deformation and improves the dynamic performance of fine-grained railway subgrades compared with untreated soils. Sensitivity analysis indicates that the water-to-cement ratio, sand-to-cement ratio, and embankment thickness are the dominant factors controlling settlement and vibration behavior. Furthermore, increasing train speed within the investigated range does not produce a linear increase in settlement. Instead, the dynamic response is governed by the combined effects of train speed, the geotechnical properties of the foundation soils, and the characteristics of the cement-stabilized layer. These findings provide a scientific basis for the design and optimization of high-speed railway subgrades constructed on fine-grained soils, particularly along the Isfahan–Tehran HSR corridor in the Vezvan–Meymeh–Qorqchi section.

کلیدواژه‌ها English

High-Speed Railway
Fine-Grained Soils
Cement-Stabilized Soil
Dynamic Settlement
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