بهینه سازی رده بندی امتیاز توده سنگ (rmr) برای سنگ‌های درزه‌دار برای سازه‌های زیرزمینی

سازه‌های امن به عنوان مهمترین سازه های دفاعی کشور ارتباط مستقیمی با امنیت ملی و توان دفاعی کشور داشته و طراحی، اجرا و نگهداری آنها بسیار ضروری می‌باشد. انجام رده بندی تجربی توده سنگ یک ابزار بسیار مفید در ارزیابی کیفیت توده سنگ و طراحی تحکیمات بوده و دید مناسبی در خصوص رفتار سنگ در مواجه با تونل ارائه می‌دهد. رده بندی امتیاز توده سنگ (rmr) یکی از مهمترین و کارآمدترین روش‌های رده بندی توده سنگ بوده که از گذشته تا امروز مورد استفاده بوده ولیکن دارای برخی نارسایی‌ها در برآورد صحیح رفتار توده سنگ می‌باشد. طی این پژوهش تعداد 10 سایت از پروژه‌های پدافندی در شرایط توده سنگ سنگ‌های ضعیف و خیلی درزه‌دار و مناسب بررسی شده و به جای مجموع امتیاز شاخص rqd و فاصله داری درزه‌ها، فاکتور درزه‌داری (joining factor) بر اساس تعداد درزه‌ها در 25 متر مربع از تونل به این رده بندی اضافه شد. همچنین پروژه‌ها به روش عددی (نرم افزار phase2) نیز تحلیل شده و نتایج تحکیمات پیشنهادی با rmr اصلاح شده مورد بررسی قرار گرفت که نتایج نشان می‌دهد که رده بندی rmr برای سنگ‌های نیمه پایدار (rmr>50) کارایی خوبی داشته ولیکن برای سنگ‌های ضعیف (rmr<50) بهتر است توده سنگ با rmr اصلاح شده با فاکتور درزه داری تحلیل گردد.

optimization of rock mass rating (rmr) classification for jointed rocks for underground structures

underground structures, as the most important structures of our country, have a direct relationship with the national security and economy power of the country, and their design, implementation and maintenance are very necessary. conducting the experimental classification of the rock mass is a very useful tool in evaluating the quality of the rock mass and designing the reinforcements, and also, it provides a good view of the behavior of the rock in the face of the tunnel. classification of rock mass rating (rmr) is one of the most important and efficient methods of rock mass classification, which has been used in the past until today, but it has some shortcomings in the correct estimation of rock mass behavior. in this research, 10 sites of defense projects in different rock mass conditions, including weak and very jointed rocks, and suitable conditions have been examined. the defense projects have been analyzed experimentally, and also, numerically using phase2 software. the experimental and numerical results of this research show that, in general, the use of rock mass classification can be very useful in evaluating the characteristics of rock mass. moreover, the use of the rmr in rocks having good conditions correctly evaluate the rock mass and is considered as a suitable design basis. however, in weak rocks, there are flaws in the evaluation, and instead of the rock quality designation (rqd) parameters and discontinuity spacing, the jointing factor can be used. in this manner, the results are better compatible with the real conditions and numerical analysis. furthermore, the results of the proposed reinforcements have been examined. these results show that the rmr classification works well for semi-stable rocks (rmr>50), but for weak rocks (rmr<50), it is better to analyze the rock mass by modified rmr, which considers jointing factor.introductionone of the most important aspects of tunneling project is its protection. the construction of underground structures as safe structures helps to preserve people's lives and cover transport achievements. one of the most important challenges in the construction of underground structures is to design these structures when facing different geological conditions. classification of rock mass engineering is one of the most effective methods in determining rock mass conditions, assessing instabilities and determining consolidations and drilling methods. rock mass rating (rmr) classification is widely used worldwide to evaluate the rock mass. however, the excavation experience has shown that this classification is not effective in some rock conditions and needs some corrections.methodology and approachesin this research, the parameters of rmr classification have been investigated and considering some flaws in the rock quality designation (rqd) system as an influencing factor in this classification, and also, the experiences gained from 10 tunnel projects in different rock conditions, it is observed that using jointing factor instead of total rqd parameters and spacing of joints can provide better results for the rock mass evaluation. the results of rmr findings have also