Numerical Modeling Study of Roadway Support Optimization Based on Stress Reduction Method Using Phase 2D
In order to investigate the stability of surrounding rocks for a roadway under different support patterns,five numerical models were developed in this research using the Phase 2D finite element software and the stress reduction method.The considered five models included the unsupported model,the bolt supported one,bolt-shotcrete supported and two bolt-shotcrete-I beam supported models with a timely and delayed support fashion.The strength factor of the surrounding rocks,the displacement contour,the number of yielded elements and the performance of bolts were recorded and analyzed.The results showed that the yielded elements of rocks were observed at 646,and the maximum displacement of the roadway was 61.47 mm for the unsupported model.By comparison,the yielded elements for the surrounding rocks and bolts declined for the both bolted and bolted-shotcrete models.The maximum displacements were reduced to 52.80 and 50.98 mm,respectively.For the bolt-shotcrete-I beam supported model with a timely support fashion,the number of yielded elements for the surrounding rocks and bolts were further reduced to 366 and 190.Maximum displacement was 26.31 mm.The delayed support model saw an increase in the yielded elements and displacement as compared to the previous counterpart model,with the yielded elements standing at 535 and 0 for the surrounding rocks and bolts,respectively.And the maximum displacement was 39.59 mm.The delayed model could reflect the influence of the support design to roadway stability in a more realistic manner,thus providing beneficial reference to the support design and optimization.
roadway supportsurrounding rock stabilitynumerical simulationplastic zonestress reduction method