Abstract:
In view of the fact that the integrity of surrounding rock is poor and the cracks are widely distributed in the current roadway advanced support operation, we take 021208 transportation entry of Huangbaici mine as the research object, and carry out the grouting anchor cable advanced support technology practice.According to the development characteristics of the surrounding rock crack of 021208 transportation entry, the key technical parameters of the advanced support technology of the grouting anchor cable are designed.The numerical simulation of the slurry diffusion of different grouting anchor cable layout schemes is carried out, and the optimal anchor cable layout scheme is determined.In the process of industrial test, the advanced support technology of grouting anchor cable is effectively connected with the original mono support through the advanced support method of stages.The field monitoring results show that: After the advanced support technology of grouting anchor cable is adopted in the transportation entry of 021208, the maximum deformation of the roof and floor of the roadway is 106 mm, and the maximum deformation of the two sides is 200 mm.The peak axial force of the anchor cable reaches 282 kN, which is 67% of its yield strength, and the overall bearing performance is good, which effectively improves the stability of the surrounding rock in the advanced area of 021208 transportation entry, and also ensures the safe and normal mining of the working face.