Abstract
Since rock mass behaviour and tunnel support are influenced by volume changes along preexisting discontinuities, an understanding of these mechanisms is fundamental to tunnel behaviour prediction and reinforcement design. It is not clear that the prediction and the design are always suitable to the in-situ joint conditions revealed from tunnelling advances.
The proposed tunnelling method is directed toward improving practical applicability of the tunnel reinforcement design based on the jointed rock mass behaviour prediction. The joint behaviour model from Barton-Bandis is built on a fitting analysis of behaviour of jointed cores and in-situ joint monitoring by a “Joint Deformeter”. Jointed rock mass behaviours are predicted for a joint condition mapped on tunnel walls and for a reinforcement of rockbolt systems using a promising distinct element method (DEM). The procedure for the method is discussed from the standpoint of its in-situ applicability.
