Analysis of a mine roof using the DDA method

Abstract

The effects of loading, joint friction angle and rock bolting on the stability of a cross-jointed mine roof model were studied using the Discontinuous Deformation Analysis (DDA). DDA results showed the existence of a zone of compression between rock bolt anchor and tensioning points, and zones of low compression between tensioning points. Moreover, radial bolts were found to be more effective that vertical bolts in stabilizing a mine roof. DDA results also validated the assumptions made in the reinforced rock arch and the flat arch methods. They demonstrated the arching phenomenon and the existence of reinforced rock units.