Study on numerical simulation of deep roadway excavation and support schemes based on measured in-situ stress

In this paper, aiming at the excavation and support of deep roadway, through the measurement of deep in-situ stress and the simulation of roadway selection and support, the stability control of roadway surrounding rock in deep and harsh high stress environment is studied. The deep stress state of the mine is preliminarily determined by the method of sleeve hole stress relief. Combined with the existing mine engineering and support means, the numerical calculation model of the roadway is constructed by the measured stress data. The problems faced by the existing roadway size in deep development are systematically compared, and the best support mode of the mine is determined by analyzing the combined support effect of spray anchor net under different bolt parameters. The simulation results show that the support effect of combined support is 2 m pipe joint ＜ 2 m cement roll ＜ 3 m cement roll. The 2 m long bolt can reduce the deformation around the roadway by 52% on average. The lengthened cement roll bolt can control the maximum attenuation of roadway deformation by 62%, and the damage depth is reduced by 26%-72%. Finally, it is recommended that the mine use 2 m long cement roll bolt for conventional combined support. When facing a worse surrounding rock environment, the stability of surrounding rock can be further curbed by lengthening the bolt, which provides an important reference for the safety construction of similar deep projects.