ABSTRACT: The Discontinuous Deformation Analysis (DDA) is a numerical model for analyzing the mechanics of discontinuous, jointed rock systems. One application of the DDA method is to use the method to evaluate the behavior of tunnel openings in jointed rocks stabilized with rock reinforcement. This paper presents the results of DDA stability evaluations for a circular roof tunnel stabilized with rock reinforcement. DDA results include the effects of rock bolt length to spacing ratio, joint spacing, and loading condition. The rock bolt tensile forces required for stability obtained from the DDA evaluations are compared with those calculated using the Reinforced Rock Arch (RRA) method.

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