مهندسی سازه و ساخت

مهندسی سازه و ساخت

پاسخ لرزه‌ای سطح زمین در حضور تونل دایره‌ای بدون پوشش مدفون در نیم‌فضای اُرتوتروپ.

نوع مقاله : علمی - پژوهشی

نویسندگان
1 پژوهشگر پسادکتری، گروه مهندسی عمران، واحد زنجان، دانشگاه آزاد اسلامی، زنجان، ایران.
2 استادیار، گروه مهندسی عمران، واحد زنجان، دانشگاه آزاد اسلامی، زنجان، ایران.
3 استاد، پژوهشکده‌ی مهندسی ژئوتکنیک، پژوهشگاه بین‌المللی زلزله‌شناسی و مهندسی زلزله، تهران، ایران.
چکیده
رفتار واقعی سطح زمین در حضور عوارض مدفون زیرزمینی در پی شناخت کامل از تأثیر ناهمسانی نیم‌فضای پیرامون مبرم می‌شود. این ناهمسانی که عموماً به صورت عملکرد اُرتوتروپیک در بافت لایه‌های زمین حاصل می‌شود، با قابلیّت تغییر در رفتار لرزه‌ای سطح توأم است. بنابراین در این مقاله، پاسخ لرزه‌ای سطح زمین در حضور تونل دایره‌ای بدون پوشش مدفون در نیم فضای اُرتوتروپ تحت امواج مهاجم SH ارائه شده است. مدل مسأله با استفاده از روش اجزای مرزی نیم‌فضا در حوزه‌ی زمان، صرفاً با مش‌بندی مرز تونل تهیّه شده است. میرایی مصالح در یک رویکرد غیر‌مستقیم به کمک توابع نمایی در معادلات انتگرالی اعمال شده است. ضمن ارائه‌ی مختصر فرمول‌بندی روش و تحلیل چند مثال صحّت‌سنجی، با محوریّت برخی پارامترهای کلیدی مدل از قبیل عامل ایزوتروپی، محتوای فرکانسی و زاویه‌ی انتشار موج، پاسخ لرزه‌ای سطح زمین حاوی تونل دایره‌ای بدون پوشش در دو حوزه‌ی زمان و فرکانس به صُور مختلف حساسیّت‌سنجی شده است. نتایج نشان داد بافت اُرتوتروپی مصالح و نهشته‌های تشکیل‌دهنده‌ی زمین نه تنها در دامنه‌ی پاسخ، بلکه در سوگیری اُلگوهای بزرگنمایی پیرامون تونل و حصول نواحی اَمن مؤثر است. همچنین، حداکثر بزرگنمایی سطح در هجوم جبهه‌ی افقی به میزان 2/3 برای عامل ایزوتروپی بیشینه‌ی مفروض مشاهده شد. . .
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Seismic Response of the Orthotropic Ground Surface Including Underground Circular Unlined Tunnel.

نویسندگان English

Saeed Mojtabazadeh-Hasanlouei 1
Mehdi Panji 2
Mohsen Kamalian 3
1 Postdoctoral Fellow, Department of Civil Engineering, Zanjan Branch, Islamic Azad University, Zanjan, Iran.
2 Assistant Professor, Department of Civil Engineering, Zanjan Branch, Islamic Azad University, Zanjan, Iran.
3 Professor, Geotechnical Engineering Research Center, International Institute of Earthquake Engineering and Seismology, Tehran, Iran.
چکیده English

The actual behavior of the ground surface in the presence of underground structures is strongly influenced by a thorough understanding of the effects of anisotropy in the surrounding half-space. This anisotropy, typically manifested as orthotropic behavior in the soil layers, is intricately linked with the seismic response of orthotropic ground surface. Therefore, this article presents the seismic response of orthotropic ground surface in the presence of an underground circular tunnel without lining subjected to incident SH-waves. The problem model is prepared solely using the boundary element method in the time-domain, with tunnel boundary discretization. Material damping is indirectly applied using exponential functions in integral equations. In addition to providing a brief formulation of the method, several verification examples are analyzed, focusing on key model parameters such as isotropy factor, frequency content, and wave incidence angle. The seismic response of the ground surface containing an unlined circular tunnel is sensitively investigated in both time and frequency domains. The results indicate that the orthotropic properties of materials and geological formations are influential not only in the response amplitudes but also in the amplification patterns around the tunnel and the establishment of safe zones. Additionally, a maximum surface amplification of 3.2 is observed during the onset of horizontal wave-front.

کلیدواژه‌ها English

The DASBEM Project
Computational Seismology
Earthquake Motions
Circular Unlined Tunnel
SH-Wave Scattering
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  • تاریخ دریافت 08 بهمن 1402
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