کاربرد نرم افزار قابلیت اعتماد RT درتحلیل پایداری تونل‌ نگهداری شده با پیچ‌سنگ

نوع مقاله : علمی - پژوهشی

نویسندگان

1 عضو هیئت علمی دانشکده مهندسی معدن دانشگاه صنعتی اراک

2 دانشکده مهندسی علوم زمین، گروه مهندسی ژئومکانیک، دانشگاه صنعتی اراک

10.22034/ijme.2020.121660.1786

چکیده

به هنگام بررسی پایداری تونل‌ها، از مدل‌ها و روابطی کمک گرفته می‌شود که دارای متغیرهایی هستند که نمی‌توان آن‌ها را قطعی فرض کرد. یکی از راه‌های در نظر گرفتن عدم قطعیت‌ پارامترهای سنگ و خاک، استفاده از روش‌ها و توزیع‌های آماری متغیرها است. در حال حاضر برای مقابله با عدم قطعیت‌، از روش‌های احتمالاتی و قابلیت اعتماد استفاده می‌شود. در این پژوهش سعی شده است با بهرهگیری از روابط فرم بسته ریاضی، برای تحلیل پایداری تونل از سه تابع حالت حدی که عبارت است از: کشش پیچ‌سنگ، ناحیه پلاستیک شدگی تونل و همگرایی تونل استفاده شود. همچنین جهت بدست آوردن احتمال شکست و شاخص قابلیت اعتماد از سه روش قابلیت اعتماد مرتبه اول، قابلیت اعتماد مرتبه دوم و شبیهسازی مونتکارلو استفاده شده که مجموعهی این تحلیلها در نرم‌افزار RT انجام گرفته است. نتایج این تحلیل‌ها نشان می‌دهد که روش‌های قابلیت اعتماد دارای قابلیت بالایی در تحلیل احتمالاتی مسائل مربوط به تحلیل پایداری تونل را دارند و این متودولوژی می‌تواند برای تحلیل احتمالاتی سایر مسائل صنعت تونلسازی نیز بکار گرفته شود.

کلیدواژه‌ها


عنوان مقاله [English]

Application of RT software in the stability analysis of tunnels reinforced by rockbolts

نویسندگان [English]

  • Hadi Fattahi 1
  • Farshad Malekmahmoudi 2
1 Department of Mining Engineering, Arak University of Technology, Arak, Iran.
2 Arak University of Technology
چکیده [English]

Traditional deterministic evaluation of geotechnical problems has long been considered insufficient since the uncertainties inherently associated with geotechnical materials cannot be considered explicitly. This is especially so for underground problems where not only the properties of rocks or soils but also the in situ stress conditions cannot be accurately estimated. This requires the development of reliability analysis for tunnelling problems. System reliability analysis of tunnelling problems is illustrated by using an iterative closed-form formulation for a circular tunnel reinforced by end-anchored rockbolts. Three performance functions, namely,the mobilized tensile force in the rockbolt, the maximum displacement and the plastic zone size of the tunnel, are considered. İn this paper, the RT software is applied to an iterative closed-form solution for a circular tunnel reinforced by rockbolts, which was proposed by Bobet and Einstein (2011). The developed surrogate models were implemented into the first-order reliability method (form), second order reliability method and Monte Carlo Simulation (MCS) to evaluate the stability of tunnels reinforced by rockbolts.

کلیدواژه‌ها [English]

  • Stability Analysis of Tunnels
  • RT Software
  • Monte Carlo Simulation
  • First Order Reliability Method
  • Second Order Reliability Method

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