مدل‌سازی بالازدگی تونل و شریان‌های حیاتی در زمین های مستعد روانگرایی تحت بار لرزه‌ای

نوع مقاله : پژوهشی

نویسندگان

1 دانشگاه ملایر

2 دانشگاه علوم و تکنولوژی میزوری

چکیده

در بسیاری از زلزلۀ های اخیر آسیب های گسترده ای به تونل های شهری و خارج شهری وارد آمده است. یکی از عوامل بسیار مخرب در این زلزلۀ ها، پدیدۀ روانگرایی خاک می‌ باشد. روانگرایی باعث کاهش تنش مؤثر و درنتیجه کاهش مقاومت برشی می شود و این موضوع موجب ایجاد تغییر شکل های بزرگ در خاک و ساز مدفون در آن می‌گردد. روانگرایی موجب جوشش خاک، گسترش عرضی، فرونشست ساز و بالازدگی ساز مدفون می شود. در بسیاری از زلزلۀ ها بالازدگی به‌علت روانگرایی خاک اطراف ساز به‌عنوان یکی از عوامل مخرب بر تونل‌ها و ساز‌های مدفون گزارش شدۀ است. در این پژوهش رفتار تونل در زمین‌های مستعد روانگرایی مدل‌سازی شدۀ است. از تحلیل تفاضل محدود دوبعدی برای مدل‌سازی آزمایش سانتریفیوژ استفاده گردیده است. مدل رفتاری ماسۀ UBC برای مدل‌سازی رفتار ماسۀ مستعد روانگرایی در نظر گرفته شدۀ است. نتایج مدل‌سازی با اندازه‌گیری‌های صورت گرفته در آزمایش سانتریفیوژ مقایسه گردیده است و توانایی مدل برای ارزیابی پدیدۀ روانگرایی در اطراف تونل‌ها مورد ارزیابی قرار گرفته است.

کلیدواژه‌ها

عنوان مقاله [English]

Numerical Modeling of Tunnels and Lifelines in Liquefiable Grounds Under Seismic Loading

نویسندگان [English]

  • َAli Reza Bagherieh 1
  • Iman Loloei 1
  • Amirhossein Bagherieh 2
1 Malayer University
2 Missouri University of Science and Technology
چکیده [English]

Earthquakes could have catastrophic impacts on tunnels and buried structures. Liquefaction phenomenon is one of the most destructive effects of earthquakes. Liquefaction results in decreasing effective stress and this consequently leads to decreases in shear strength of the soil. As a result, large deformation in both soil and buried structure occurs. Moreover, liquefaction causes soil boiling, lateral spreading, structure settlement and the uplift of buried structure. In many earthquake cases, uplift of the buried structure due to liquefaction was reported as one of the major damaging factors. This research sought to model earthquake induced uplift of buried structures including tunnels in the soil susceptible to liquefaction under seismic loading. Two dimensional finite difference modeling is employed to simulate centrifuge experiments. The UBCSAND model was adopted as constitutive model in numerical simulations. The modeling results are compared with the measurements of centrifuge experiment and the capabilities of the model to predict the liquefaction of soil around tunnels are assessed.

کلیدواژه‌ها [English]

  • Lifeline
  • Tunnel
  • Liquefaction
  • Uplift
  • Earthquake
  • Centrifuge Tes

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