关键词: 煤矿巷道, 爆破掘进, 装药结构, 围岩损伤, 巷道掘进

Abstract: In order to deal with the problem of large damage to surrounding rock during blasting and driving of coal mine roadway coupled with continuous charge, through theoretical analysis, a calculation formula for the damage range of rock during blasting of finite-length columnar charge is obtained. Using LS-DYNA numerical software, the damage law of surrounding rock during blasting of different cylindrical charge structures was studied. The results show that when the continuous cylindrical charge is coupled, the radius of the cavity and the surrounding rock around the blast hole have the largest damage radius, 81mm and 311mm, respectively. When the discontinuous cylindrical charge is not coupled, the cavity radius and crack length are the smallest, 41mm and 200mm, respectively. In the fissure area, the measuring point at a distance of 120mm from the blast hole wall, when using uncoupled discontinuous cylindrical charges, the damage factor is 0.194, which are 42% and 50% of coupled continuous, coupled discontinuous and uncoupled continuous charges, respectively and 53%. In summary, when blasting and driving coal mine argillaceous siltstone roadways, the use of uncoupled discontinuous columnar charges can not only make full use of the energy during blasting, but also reduce the damage to the surrounding rock of the roadway by the blasting load.