ارزیابی الگوی بزرگنمایی لرزه‌ای سطح زمین در ساختگاه‌های واقع بر سازه‌های زیرزمینی جعبه‌ای شکل

نوع مقاله : Articles

نویسندگان

1 گروه مهندسی عمران، دانشگاه آزاد اسلامی واحد زنجان

2 دانشگاه خوارزمی

چکیده

مطالعه‌ی حاضر به بررسی اثر حضور سازه‌های زیرزمینی جعبه‌ای شکل منفرد و دوقلو بر تغییرات پاسخ لرزه‌ای سطح زمین می‌پردازد. برای این منظور با انتخاب یک رویکرد عددی تفاضل محدود اعتبارسنجی شده، ابتدا تأثیر پارامترهای مهم تأثیرگذار بر مسئله از جمله عمق تونل، انعطاف‌پذیری پوشش تونل، محتوای فرکانسی تحریک و فاصله تونل‌ها، مطالعه شده است. در ادامه بر مبنای شتاب‌نگاشت‌های واقعی زلزله، اثر حضور سازه‌های زیرزمینی جعبه‌ای شکل بر طیف پاسخ لرزه‌ای در سطح زمین مورد ارزیابی قرارگرفته و نتایج با طیف پاسخ در شرایط میدان آزاد مقایسه شده است. نتایج این تحقیق نشان می‌دهد که وجود سازه‌های زیرزمینی جعبه‌ای شکل تأثیر محسوسی بر تغییر پاسخ سطح زمین دارد به‌طوری‌که می‌تواند تا حدود دو برابر موجب بزرگنمایی پاسخ لرزه‌ای سطح زمین نسبت به حالت میدان آزاد شود. این موضوع به‌خصوص در مورد سازه‌های زیرزمینی دوقلوی سطحی مشهودتر است.

کلیدواژه‌ها

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سابقه مقاله

  • تاریخ دریافت: 23 آذر 1394
  • تاریخ بازنگری: 23 بهمن 1399
  • تاریخ پذیرش: 06 دی 1399

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