| Aiming at the condition, the collapse column of working face x12 of Zhangcun Coal Mine 2502, by using the FLAC3D numerical software, the collapse column deformation in coal seam was simulated, and stress change in the advancing process of working face was studied, the results show that, in the wake of the mining, it is obvious that the gradual emergence of stress concentration phenomenon. During the collapse column, damage range of roof of working face is about 54 m, and the footwall is about 22 m. From mining to collapse column 35 m, which affected by mining action at the same time. It deduced that the combination of coal mining machine cutting blasting and crushing could force a passage, when carry on the feasibility analysis to it. The engineering practice indicates that the project guarantees the continuous advancing working face, not only effectively control the influence of the collapsing column on the production, improve the recovery percent of coal resources, but also provide relevant technical guidance for the collapse column working face in later as well. |
