Abstract: The support effect of the original active advance support scheme of the mining roadway is poor,which can′t meet the stability requirements of the roadway. Based on the bolt-grouting support technology and the failure range of surrounding rock,a double-depth partition bolt-grouting support technology is proposed as an optimized support scheme for mining roadway. According to the results of borehole peep detection and theoretical calculation of roadway field investigation,the damage range of surrounding rock is determined,and the grouting depth of surrounding rock is divided into regions. The reinforcement performance of surrounding rock after grouting is analyzed theoretically. The grouting reinforcement effect of surrounding rock is quantitatively analyzed by the results of coal mechanics test before and after grouting. The support effect of double-depth partition bolt-grouting support technology in roadway is studied by combining numerical simulation with engineering application. The results show that the damage range of the surrounding rock of the roadway roof is about 2. 7 m,and the damage range of the two sides is about 5. 4 m. The roof and the two sides are divided into " deep" and " shallow" grouting reinforcement areas. After grouting reinforcement,under the synergistic support of grouting bolt (cable) and solidified slurry,the strength and cohesion of surrounding rock are increased,and the ability of surrounding rock to resist deformation is improved. After adopting the doubledepth partition bolt-grouting support scheme,the deformation of the roadway,the depth and failure range of the plastic zone of the surrounding rock are significantly reduced,and the stability of the roadway is improved. The error between the engineering application monitoring data results and the numerical simulation results is small,which verifies the rationality of the numerical simulation. 

Key words: active advance support,grouting reinforcement,numerical simulation,grouting bolt (cable)