Deformation and stress distribution laws of surrounding rock in gateways under multiple fault conditions

To understand the deformation and stress distribution patterns of surrounding rocks in fault zone stope roadways, the “ theoretical mechanics model for the excavation stage of fault zone stope roadways ” was derived through theoretical calculations. Combined with numerical simulations,the stress and plastic zone distributions near the fault during the working face advancement process were studied, as well as the deformation patterns of the surrounding rocks at the top and sides of the roadway. The results indicate that the deformation and stress distribution patterns of the surrounding rocks in fault zone stope roadways are related to the fault location; the surrounding rocks of the roadway are affected by mining activities, with the maximum principal stress gradually increases and concentrates at the fault,the range of the plastic zone expanding to about 5 m, and shear-tensile failure occurring at the left shoulder angle;the loosening influence range of the roadway roof is 4 m,with the subsidence amount decreasing further from the roadway surface,the closer the surrounding rocks on both sides of the roadway are to the surface, the greater the displacement; under the influence of the fault, the vertical displacement of the hanging wall surrounding rocks increases,while the horizontal displacement is almost zero.