关键词: 深部巷道, 围岩稳定性, 预应力锚杆, 屈服强度, 支护优化, 数值模拟

Abstract: Aiming at the engineering problems of large deformation, insufficient strength and pre⁃ stress of traditional bolt support, and poor matching of support in deep high ground stress mining roadway under mining disturbance, taking the 183 下 06 deep mining roadway of a coal mine in East China as the en⁃ gineering background, the theoretical analysis, indoor rock mechanics test, FLAC3D numerical simulation and field industrial test are comprehensively used to systematically study the mechanism of bolt yield strength and prestress on the stress field, deformation characteristics and support stability of surrounding rock in deep roadway. By analyzing the failure mechanism of the original support scheme, five gradient high-strength prestressed bolt support optimization schemes are designed, and the nonlinear response law between the additional stress field of the bolt and the prestress is compared and revealed. Finally, a high�strength, high-prestress, and low-density collaborative support parameter system is selected. Based on the optimal parameters, a new type of high-strength prestressed anchor bolt is developed. The measured yield strength is 1 120 MPa, the tensile strength is 1 213 MPa, and the impact absorption energy is 78 J. The field monitoring results show that the new bolt support system can effectively inhibit the roof separation and the convergence of the two sides of the deep roadway. The deformation of the roof is reduced by 60% com⁃pared with the original scheme, and the deformation of the two sides is reduced by 46%. The convergence speed of surrounding rock deformation is fast and the overall stability is significantly improved. The re⁃ search results can provide engineering reference for support parameter optimization and surrounding rock stability control of mining roadway in deep high ground stress mine.

Key words: deep roadway, stability of surrounding rock, prestressed ground anchor bar, yield strength, support optimization, numerical simulation