برآورد نیروی محوری طولی باقیمانده در پوشش تونل‌های سگمنتی ناشی از نیروی جک های پیشران TBM

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترای ژئوتکنیک؛ دانشکده‌ی مهندسی عمران، دانشگاه صنعتی سهند تبریز

2 استادیار؛ دانشکده‌ی مهندسی عمران، دانشگاه صنعتی سهند تبریز

3 استاد؛ دانشکده‌ی مهندسی عمران، دانشگاه صنعتی سهند تبریز

چکیده

پوشش تونل ها در اجرا با دستگاه حفاری تمام مقطع سپری در محیط های شهری شامل قطعات بتنی (سگمنتی) می باشد که در هر گام پیشروی یک رینگ را تشکیل می دهند. جک های پیشران دستگاه حفاری، نیروی زیادی بر رینگ ها وارد می نمایند. این نیروها به تناوب کاهش یافته و مجدداً اعمال می گردند که مقداری از این نیروها در داخل پوشش باقی می‌مانند. این نیروی محوری طولی می تواند در سختی خمشی طولی کل پوشش تونل مؤثر باشد. از طرفی دوغاب تزریقی اطراف پوشش با توجه به ماهیت گیرش وابسته به زمان، تاثیر بسزایی بر مقدار این نیروی محوری دارد. در این مقاله ابتدا بر اساس نتایج حاصل از آزمایش های ادئومتری بر روی دوغاب پایه سیمانی تزریقی، مدل رفتاری وابسته به زمان برای شرایط محصور شده ارائه شده است. سپس یک روش پیشنهادی تحلیلی با استفاده از مدل رئولوژی مناسب، جهت مدلسازی ساخت مرحله ای، باگذاری چرخه ای جک های پیشران و نیز گیرش وابسته به زمان دوغاب ارائه گردید، بطوریکه امکان محاسبه نیروی باقیمانده در هر رینگ پوشش سگمنتی تونل میسر می گردد. بمنظور بررسی روش پیشنهادی، نیروی باقیمانده در پوشش تونل خط یک قطار شهری تبریز به این روش محاسبه شده و تحلیل حساسیتی نیز بر روی برخی پارامترهای اثرگذار انجام گردیده است.

کلیدواژه‌ها


عنوان مقاله [English]

Estimation of Residual Longitudinal Axial Force in Segmental Tunnel Linings Caused by TBM Thrust Jacks

نویسندگان [English]

  • R. Sabbagh Kermani 1
  • M. Emami Tabrizi 2
  • M.Re. Chenaghlou 3
1 Civil Engineering Faculty, Sahand University of Technology, SUT
2 Civil Engineering Faculty, Sahand University of Technology, SUT
3 Civil Engineering Faculty, Sahand University of Technology, SUT
چکیده [English]

Lining of tunnels constructed using full-face tunnel boring machine consist of set of concrete segments which form a ring at each step of construction. In order to move forward, TBM inserts a great force through thrust jacks resting on segments. Installing a new ring requires decrease or elimination of jacking force. Therefore, the magnitude of force alternates as the construction continues which a part of this force remains as residual through the lining. This residual force may influence longitudinal flexural stiffness of the lining. On the other hand, time-dependent behavior of injected grout has a significant effect on the residual force. In this study first the time-dependent behavior of cement-based grout considering confining condition is investigated using the oedometer test and then modeling of staged tunnel construction and alternate loading of thrust jacks considering time-dependent grout setting is proposed using an analytical approach. In the end, residual force of lining after construction could be calculated. This approach is used to estimate the longitudinal residual force in No.1 line of Tabriz Subway Lining.

کلیدواژه‌ها [English]

  • Tunnel
  • Concrete lining
  • Segment
  • Longitudinal Axial Force
  • Grout
  • Staged Construction
  • Thrust Jacks
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