Effects of joint orientation and spacing on the boreability of jointed rock mass using tunnel boring machines

Rock mass boreability plays a key role in the performance of tunnel boring machines (TBMs). The angle and orientation of the plane of joint are two factors which affect the boreability of the jointed rock masses. This paper is aimed at describing the combined effects of joint orientation and spacing on the boreability and presenting a new model and classification system to predict the boreability of the jointed rock masses, focusing on field...