مدلسازی عددی سه‌بعدی اندرکنش گسل شیب‌لغز و تونل با رویه بتنی

نوع مقاله : مقاله پژوهشی

نویسندگان

• محمد امین برفه ئی ¹
• مهدا مرتضوی زنجانی ²
• عباس سروش ³

¹ واحد دانشگاهی گرمسار، دانشگاه صنعتی امیرکبیر، گرمسار، ایران

² واحد دانشگاهی گرمسار، دانشگاه صنعتی امیرکبیر ، گرمسار، ایران

³ دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی امیرکبیر، تهران، ایران

10.22067/jfcei.2022.70954.1043

چکیده

در این مقاله تاثیر جابه‌جائی گسل شیب‌لغز معکوس بر تونلی عمود بر خط گسل در پلان با نرم‌افزار اجزای محدود پلکسیس سه‌بعدی مطالعه ‌شده‌ و اثر زاویه گسل، نوع خاک منطقه و عمق قرارگیری تونل بر "مسیر انتشار گسلش"، "نمودارهای جابه‌جائی سطح خاک" و "تغییر شکل و نیروهای وارد بر پوشش تونل" ارائه شده‌اند. نتایج تحلیل‌ها نشان می‌دهد که تونل باعث ایجاد نواحی تمرکز کرنش در خاک زیر خود و تا حد زیادی مانع از رسیدن جابه‌جائی گسلش به لایه‌های خاک بالاسر خود (در محور تونل) شده، حال آنکه موجب بالازدگی نسبی خاک در دو طرف آن در سطح زمین می‌شود. علاوه بر آن در تونل عمیق‌تر، نیروی وارده بر پوشش تونل (نیروی محوری و لنگر خمشی) در اثر جابجائی گسل بیشتر است. همچنین با آنالیز حساسیت برای کاهش اثر مرز، نسبت ابعادی مناسب برای مدلسازی اندرکنش تونل و گسل پیشنهاد شده‌است. بررسی‌ها نشان می‌دهد که نیروی محوری بخصوص در زوایای گسل ملایم به طول مدل حساس است حال آنکه لنگر خمشی در مدلسازی با ابعاد متعارف (4-5 برابر عمق لایه خاک) بطور مناسب قابل ارزیابی می‌باشد.

کلیدواژه‌ها

• انتشار گسلش
• مدلسازی عددی اجزای محدود
• تحلیل سه‌بعدی
• تونل
• پوشش بتنی

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عنوان مقاله [English]

Three-Dimensional Numerical Modeling of Interaction of dip-slip Fault and Tunnels with Concrete Lining

نویسندگان [English]

• Mohammad Amin Barfehee ¹
• Mahda Mortazavi Zanjani ²
• abbas soroush ³

¹ Garmsar Campus, Amirkabir University of Technology, Garmsar, Iran

² Garmsar Campus, Amirkabir University of Technology, Garmsar, Iran

³ Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran

چکیده [English]

In this paper, the effect of reverse dip-slip fault movement on a tunnel, being perpendicular to the fault plane in plan view, is modeled numerically with finite-element software, Plaxis 3D and the effect of factors such as fault dip angle, soil type and tunnel’s depth on “fault rupture path”, “ground surface displacements” and “deformation and forces in the tunnel lining” is presented. The results indicate that the presence of tunnel gives rise to zones of stain localization in the soil underneath the tunnel and somewhat prevents the rupture zone to reach the ground surface on its top (centerline of the tunnel) whereas it causes relative uplift on the ground surface on both sides. Moreover, in deeper tunnels, the impact of faulting on lining forces is more pronounced. Furthermore, to reduce the influence of the outer boundaries, performing sensitive analysis, appropriate dimensions are recommended for modeling the interaction of fault and tunnel. It is shown that axial force, especially in mild fault dip angles, is very sensitive to model length while bending moment can be correctly estimated by typical modeling dimensions (i.e., model length 4-5 times the soil layer height).

کلیدواژه‌ها [English]

• fault rupture propagation
• finite element numerical modeling
• three-dimensional analysis
• tunnel
• concrete lining

مراجع

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