Abstract
The assembly type of segmental linings has a great impact on mechanical behaviors and failure mechanism of the linings. In this paper, a sophisticated 3D FEM model for segmental linings with different assembly types (single ring, three rings cross-jointed and stagger-jointed) was established to investigate the mechanical behaviors and failure mechanism of the linings under loading condition, with particular focus on the structural effect of the staggered-jointed linings. The effectiveness of the numerical model was verified by the data from the on-site measurements. The results show that the segmental linings turn into horizontal ellipse under the overloading condition. For the stagger-jointed linings, the initial cracks are emerged on the segment body and some oblique cracks and circumferential cracks are generated due to the interaction among rings. The failure process of the stagger-jointed linings was illustrated by the damaged plasticity point which are mainly staggered distributed on segment body and the time sequence of the points reaching certain structural performance state are progressive and discrete. The stagger effect is captured on the internal force of stagger-jointed linings and the major reasons causing the bending moment transmission are analyzed. Above analysis will contribute to the structural safety evaluation of the tunnels.
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