Evaluation of tunnel excavation methods in accordance with engineering geology and rock mass classification systems [Tünel açma yöntemlerinin mühendislik jeolojisi ve kaya sınıflama sistemleri ile değerlendirilmesi]

In this study,the relationship between engineering geological applications and tunnel excavation methods were described. even if several tunnel excavation methods have been suggested from past up to the present,most of them were only the various derivations of full face and sequential excavation techniques. internationally well-known tunnel excavation methods try to classify rock mass behaviors,but,cannot form a numerical base for the claimed methods. therefore,objective evaluations are required (especially for their applications) to overcome the deficits rock mass classification systems are used. natm and adeco-rs are the two widespread methods at the present day tunnel practice. in both methods,rock mass behavior has been categorized in different ways. however,both of them failed to generate objective base to describe the rock mass behavior. in this study,practical difficulties,functional relation of commonly used tunnel excavation methods between rock mass classifications systems and their application to numerical models,have been described. for this aim; transition of rock mass classification systems to tunnel excavation and support classes,their application to numerical models,their assumptions,and in point of view of the engineering geology; assumption defects have been described with the help of an example. © 2015,tmmob - jeoloji muhendisleri odasi. all rights reserved.