关键词: 聚能爆破, 裂纹扩展, 装药参数, 切顶卸压, 无煤柱开采

Abstract: Based on the engineering background of 11101 transport channeling in Qizhijing Coal Mine (East District), the optimization of charging parameters of non-pillar cutting shaped blasting in thick coal seam is studied. In this paper, through the mechanism study of roof-cutting blasting and the theoretical study of charging parameters, and using numerical simulation to carry out single-hole and multi-hole blasting validation, the roof-cutting aggregation blasting test was designed for the engineering situation of 11101 working face. The results show that the fracture rate of broken roof mainly composed of sandy mudstone is lower than that of sandstone roof and intact roof. At the same time, it is found that when the roof in the sealing section is sandy mudstone, the orifice will be damaged to a certain extent. The pre-fissure and slit effect of stope roof directly influences the filling effect of goaf gangue and then influences the stress transfer of overlying strata. The relevant conclusions are verified by the field blasting test, and the blasting technical parameters suitable for the 11101 working face of Qijingjing Coal mine (East District) are determined, which is a key technology to guide the top cutting pressure relief.