پژوهشنامه حمل و نقل

پژوهشنامه حمل و نقل

مطالعه رفتارلرزه‌ای تونل های متقاطع دایره ای شکل تحت شرایط مختلف

نوع مقاله : مقاله پژوهشی

نویسندگان
الهام صالحی مهربان 1
مریم یزدی 2
علیرضا صادق آبادی 3
1 دانش آموخته کارشناسی ارشد، گروه مهندسی عمران، دانشکده مهندسی عمران و منابع زمین، واحد تهران مرکزی، دانشگاه آزاد اسلامی، تهران، ایران
2 استادیار، گروه مهندسی عمران، دانشکده مهندسی عمران و منابع زمین، واحد تهران مرکزی، دانشگاه آزاد اسلامی، تهران، ایران
3 دانش آموخته دکترا، گروه مهندسی عمران، دانشکده مهندسی عمران و منابع زمین، واحد تهران مرکزی، دانشگاه آزاد اسلامی، تهران، ایران
10.22034/tri.2024.421905.3198
چکیده
با افزایش جمعیت و توسعه زیرساختهای حمل و نقل شهری، روند ساخت هر چه بیشتر مترو شهری و به تبع آن تقاطع تونل‌ها وجود دارد. مقاله حاضر به بررسی رفتار لرزه ای تونلهای متقاطع دایره ای شکل (مترو) در نرم افزار تفاضل محدود FLAC 3D پرداخته است. متغیرهای این تحقیق شامل فواصل بین دو تونل، عمق قرارگیری تونل ها، زوایای بین تونل ها و نوع خاک بوده است. مدلهای مختلف با مقایسه میزان جابه‌جایی کل، نشست و تنش، مورد بررسی و تحلیل قرار گرفته اند. در نهایت با ارزیابی نتایج مشاهده شد که با کاهش عمق قرارگیری تونل ها میزان جابه‌جایی‌ها افزایش یافته و همچنین با افزایش زاویه بین تونل ها از میزان جا به جایی کاسته شده است. نوع خاک در تحلیل‌های لرزه‌ای از اهمیت ویژه ای برخوردار است و با کاهش مدول الاستیسیته (E) و ریزتر شدن دانه‌های خاک تاثیر امواج بر خاک و سازه به مقدار چشمگیری افزایش یافته است. نتایج بیانگر این است که میزان عمق قرارگیری تونل ها تا 19 % ، فاصله بین دو تونل تا 5/19% و نوع خاک تا 37% و زاویه بین تونل ها تا 67% در میزان جابه‌جایی کل موثر بوده‌اند.
کلیدواژه‌ها
تونل‌های متقاطع غیرهمسطح
تونل دایره‌ای
FLAC3D‌
بار دینامیکی

موضوعات

عنوان مقاله English

Study of Seismic Behavior of Circular Crossing Tunnels under Different Conditions

نویسندگان English

Elham Salehi Mehraban 1
Maryam Yazdi 2
Alireza Sadeghabadi 3
1 M.Sc., Grad., Department of Civil Engineering, Faculty of Civil Engineering and Earth Resources, Central Tehran Branch, Islamic Azad University, Tehran, Iran.
2 Assistant Professor, Department of Civil Engineering, Faculty of Civil Engineering and Earth Resources, Central Tehran Branch, Islamic Azad University, Tehran, Iran.
3 Ph.D., Grad., Department of Civil Engineering, Faculty of Civil Engineering and Earth Resources, Central Tehran Branch, Islamic Azad University, Tehran, Iran.
چکیده English

With the increase in population and the development of urban transportation infrastructure, there is a trend of building more urban subways and, as a result, the intersection of tunnels. The present article investigates the seismic behavior of circular cross tunnels (metro) in FLAC 3D finite difference software. The variables of this research included the distances between two tunnels, the depth of the tunnels, the angles between the tunnels and the type of soil. Different models have been investigated and analyzed by comparing the amount of total displacement, settlement and stress. Finally, by evaluating the results, it was observed that by decreasing the depth of the tunnels, the displacements increased and also by increasing the angle between the tunnels, the amount of displacements decreased. The type of soil is of particular importance in seismic analysis, and with the decrease of the modulus of elasticity (E) and the finer grains of the soil, the impact of waves on the soil and the structure has increased significantly. The results show that the depth of the tunnels up to 19%, the distance between two tunnels up to 19.5%, the type of soil up to 37% and the angle between the tunnels up to 67% were effective in the amount of total displacement.

کلیدواژه‌ها English

Non-Coplanar Cross Tunnels
Circular Tunnel
FLAC3D
Dynamic Load
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