Abstract: Under the influence of mining on the working face,the geological structure area is prone to induce rockburst, which poses significant safety hazards to mining operations.In response to the problem of intensified deformation and support failure of deep surrounding rock in a certain mine under high stress,high permeability and complex geological conditions,in or der to clarify the deformation and failure mechanism of deep surrounding rock and optimize the support scheme,triaxial cyclic loading and unloading tests were used to analyze the rock strength,deformation capacity and energy evolution characteristics under different confining pressure conditions.Conduct FLAC3D numerical simulation to reveal the propagation law of stress waves,stress concentration distribution,and rock failure mode under different dip angle joint conditions.Combining on-site stress monitoring to obtain stress changes and deformation responses of the surrounding rock of the roadway under mining dis turbance,and using them to verify numerical simulation results and determine support parameters.Research has shown that in deep high stress environments,the joint dip angle of surrounding rock significantly affects the propagation of stress waves and the form of rock failure.As the joint dip angle increases,the range of tensile failure of the rock mass expands,the area of shear failure gradually increases,and the stability of the surrounding rock significantly decreases.Under high stress conditions,the energy evolution characteristics of surrounding rock are characterized by a slight increase in the proportion of elastic energy at low stress states,while the proportion of dissipated energy significantly increases at high stress states,indicating that surrounding rock is more prone to plastic deformation and energy dissipation in high stress environments.On this basis,an anchor mesh spraying combined support scheme was proposed,which enhances the bonding between the anchor rod and the surrounding rock through resin anchoring,restrains the fractured surrounding rock with metal mesh,and forms a continuous closed protective structure through the spraying layer,thereby improving the overall integrity and self stability of the roadway surrounding rock. The research results indicate that this support scheme has lower material costs compared to traditional U-shaped steel arch sup port,and can effectively reduce bottom plate uplift,control roof crack development and convergence deformation of the two sides.The integrity of the roadway section and the stability of the surrounding rock are significantly improved,providing theoret ical basis and technical support for the prevention and control of rock deformation in deep mine roadways.

Key words: deep mining,surrounding rock deformation,support optimization,FLAC3D simulation