پاسخ گذرای سطح زمین در حضور ناهمگنی دوقلوی زیرزمینی در برابر امواج مهاجم لرزه‌ای

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی عمران، واحد زنجان، دانشگاه آزاد اسلامی، زنجان، ایران

چکیده

این پژوهش بر تحلیل لرزه‌ای سطح زمین در حضور ناهمگنی دوقلوی بیضوی نرم زیرزمینی در برابر امواج مهاجم برون‌صفحه‌ی SH متمرکز شده است. در تهیه‌ی مدل، از روش اجزای مرزی نیم‌صفحه در حوزه‌ی زمان بهره گرفته شده است. این روش تنها با استقرار المان بر روی وجه میانی ناهمگنی‌ها، به تحلیل مسئله می‌پردازد. با توسعه‌ی فرمول‌بندی برای ناهمگنی دوقلو و پیاده‌سازی عددی‌ آن در قالب الگوریتم داس‌بِم، مثال‌هایی پیرامون ارزیابی کیفیت روش مزبور ارائه شده است. در ادامه، با در نظر گرفتن نسبت ‌شکل ناهمگنی و زاویه‌ی تابش امواج مهاجم، پاسخ گذرای سطح و نحوه‌ پراکنش امواج لرزه‌ای در اثر برخورد به این عارضه در حوزه‌ زمان نشان داده شده است. سپس، با تبدیل نتایج به حوزه‌ فرکانس، دامنه‌ تغییر مکان و بزرگنمایی سطح زمین مورد مطالعه قرار گرفته است. نتایج به‌وضوح مبین نقش چشمگیر ناهمگنی دوقلوی بیضوی بر پاسخ لرزه‌ای سطح است و نشان می‌دهد، حداکثر تفرّق و بیشینه‌ی بزرگنمایی امواج، در نسبت شکل حداقل و هجوم امواج قائم حاصل شده است. روش حاضر به‌عنوان راهکار برای مدل‌سازی رفتار لرزه‌ای سطح در حضور عوارض توپوگرافی توپر زیرزمینی پیشنهاد شده و نتایج حاصل، در تکمیل و تدقیق آئین‌نامه‌های لرزه‌ای موجود قابل استفاده می‌باشد.

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