طراحی و ساخت جعبه برش دو بخشی جهت مدل‌سازی گسلش عادی و معکوس در دستگاه سانتریفیوژ ژئوتکنیکی

نوع مقاله : Articles

نویسندگان

1 گروه زمین‌شناسی، دانشکده علوم، دانشگاه فردوسی مشهد

2 دانشکده مهندسی عمران، پردیس دانشکده‌های فنی، دانشگاه تهران

چکیده

در اثر جابه‌جایی ریز صفحات نسبت به همدیگر امواج لرزه‌ای و شکست گسل شکل می‌گیرد که با توجه به عمق، میزان جابه‌جایی، نوع جابه‌جایی، شرایط زیرسطحی پیامدهای متنوعی را بر روی سطح زمین از خود نشان می‌دهد. تاکنون مطالعات محدودی بر روی گسلش سطحی صورت گرفته است اما به دنبال وقوع سه زمین‌لرزه چی‌چی تایوان، دوزجی وکوجاعلی ترکیه انجام چنین مطالعاتی شتاب گرفته است. با توجه به از بین رفتن سریع شواهد سطحی گسلش و کم بودن زمان بررسی‌ها از یک طرف و زمان‌بر بودن و بالا بودن هزینه ساخت نمونه‌های بزرگ‌مقیاس (شرایط 1g) از طرف دیگر، اهمیت مطالعات گسلش در شرایط گرانش تشدید شده (Ng) به کمک دستگاه سانتریفیوژ را آشکار می‌کند. در این تحقیق ابتدا جزئیات جعبه دو بخشی گسلش مورد استفاده تشریح شده است. سپس نتایج هفت آزمایش شبیه‌سازی گسلش انجام شده به کمک این جعبه ارائه شده است. پنج آزمایش اولیه به‌منظور کالیبراسیون جعبه و کاهش شرایط مرزی بوده است و دو آزمایش نیز به شبیه‌سازی گسلش عادی و معکوس-  بعد از کسب شرایط مطلوب – بر روی خاک‌های دانه‌ای پرداخته است سپس نتایج مقدار جابه‌جایی منتقل شده به سطح زمین، میزان جابه‌جایی مورد نیاز سنگ کف جهت ظهور گسل در سطح، تغییر زاویه گسل از سنگ کف تا سطح زمین، وسعت منطقه تغییر شکل در گسلش معکوس و عادی با همدیگر مقایسه شده است.

کلیدواژه‌ها

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  • تاریخ دریافت: 14 آذر 1396
  • تاریخ بازنگری: 26 بهمن 1399
  • تاریخ پذیرش: 06 دی 1399

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