Modification of rock mass rating system:Interbedding of strong and weak rock layers  

作　　者：Mohammad Mohammadi Mohammad Farouq Hossaini 

机构地区：[1]The Alborz Tunnel Site,Geodata Engineering,Mazandaran Province,Iran [2]Faculty of Mining Engineering,Engineering University College,University of Tehran,Tehran,Iran

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2017年第6期1165-1170,共6页岩石力学与岩土工程学报（英文版）

摘　　要：Rock mass classification systems are the very important part for underground projects and rock mass rating(RMR) is one of the most commonly applied classification systems in numerous civil and mining projects. The type of rock mass consisting of an interbedding of strong and weak layers poses difficulties and uncertainties for determining the RMR. For this, the present paper uses the concept of rock bolt supporting factor(RSF) for modification of RMR system to be used in such rock mass types. The proposed method also demonstrates the importance of rock bolting practice in such rock masses. The geological parameters of the Shemshak Formation of the Alborz Tunnel in Iran are used as case examples for development of the theoretical approach.Rock mass classification systems are the very important part for underground projects and rock mass rating(RMR) is one of the most commonly applied classification systems in numerous civil and mining projects. The type of rock mass consisting of an interbedding of strong and weak layers poses difficulties and uncertainties for determining the RMR. For this, the present paper uses the concept of rock bolt supporting factor(RSF) for modification of RMR system to be used in such rock mass types. The proposed method also demonstrates the importance of rock bolting practice in such rock masses. The geological parameters of the Shemshak Formation of the Alborz Tunnel in Iran are used as case examples for development of the theoretical approach.

关 键 词：Rock mass rating(RMR) Strong and weak rock layers Interbedding Rock bolt supporting factor(RSF) Alborz tunnel 

分 类 号：TU45[建筑科学—岩土工程]