Numerical Simulation Study on Control Technique for Coal Roadway with Strong Rock Burst Hazard in Deep Mine

In order to study the control technique of the coal roadway with strong rock burst hazard in a deep mine, in this paper, 7121 working face in a mine was taken as the engineering backgroundt, and analysis was carried out on the surrounding rock stress, displacement and plastic zone of four roadway control schemes based on FLAC^2D numerical simulation software. The numerical calculation results indicated that the roadway peak stress of Scheme 3 was minimal and maximum stress was 30.68 MPa, the peak stress reduced about 5 MPa; the roadway deformation of Scheme 4 was minimal, the convergence amount on two sides was 21.36 mm and the convergence amount between roof and floor was 16.70 mm; the large-diameter borehole created a plastic zone in the surrounding rock in advance, which effectively released the elastic energy accumulated in coal and rock mass. "Three-structure" control technique has good pressure relief effect, small surrounding rock deformation and more energy release, which destroyed the strength and energy condition of rock burst. The engineering practice showed that the control effect of the roadway surrounding rock deformation was obvious, this verified the reasonableness of the numerical simulation conclusions. The research results can provide reference and guidance for the prevention and control of strong coal or rock dynamical disasters in the deep mine.