Research on reinforcement mechanism of grouting anchor cable in the roadway of broken surrounding rock in Hancheng mining area
Taking the No.3315 transportation roadway of Sangshuping Mine in Hancheng,Shaanxi Province as the research background,through the research on the reinforcing effect of grouting anchor cable on the roadway of broken surrounding rock,the reinforcing mecha-nism of grouting anchor cable was revealed,the principle of the design of the roadway supporting of soft coal seam was put forward,and the supporting scheme was further optimized,and by adopting high-strength anchor cable to reinforce the surrounding rock,the overall stability of the surrounding rock was improved,so as to achieve the effect of effectively preventing the deformation and damage of sur-rounding rock.According to the monitoring results,after reinforcement,the average convergence volume of the sinking amount of the roadway roof from the original supporting method to the side was only 32.7 mm,the average roof sinking amount was only 28.6 mm,the average surrounding rock deformation was only 15.6％of the original supporting scheme,after the deformation and stability of the roof,the bed separation amount of the roadway roof was relatively small,and the average displacement of the deep base point after the stabili-ty of the surrounding rock was only 55％of the original supporting scheme.It shows that the optimized supporting scheme can effectively control the surrounding rock deformation of the roadway,effectively control the surrounding rock bed separation within the anchorage ar-ea,reduce the bending and settlement of the roof,and enhance the stability of the roof,this scheme can effectively control the deforma-tion of surrounding rock.This study provides an important theoretical basis and engineering experience for the supporting design of the roadway of soft coal seam,and provides reference and guidance for the supporting of the roadway of soft coal seam.
broken roofroadway supportgrouting anchor cablesurrounding rock deformationroadway stability
NETL
NSTL
万方数据
