The paper discusses continuum and discontinuum modelling in tunnel engineering. A brief review of fundamentals is presented in connection with the use of closed-form solutions and computer based numerical methods. A few remarks are derived on the choice of ...

The history of stress around a circular tunnel during excavation in a homogeneous, isotropic, linear elastic or plastic medium with a strain softening behavior, subjected to either isotropic (Ko = 1) or anisotropic (Ko = 2) state of stress, in 3D conditions ...

<p>Recent innovations in yield-control support systems are allowing contractors to increase the rate of advance when tunnelling in difficult conditions associated with severely squeezing ground. Such systems are being implemented and proven in tunnelling projects ...