Plastic deformation of surrounding rocks of deep-level tunnels

摘要

An elastoplastic hollow cylinder model is taken here to undertake theoretical analysis and numerical simulation of surrounding rock deformation of circular tunnels based on different support systems. After conducting comparisons in the width of the yield region and the shrinkage extent of inner tunnel diameter, we draw some conclusions that rock bolting support is still the most economical and most practical support way at present, and for the steel-frame support form an indirectly system is safer than a direct one. Besides, the rational gap range of indirect support system is also discussed in this paper.