深埋高水平应力巷道底板深孔爆破研究

Deep Hole Blasting for Deep Buried High Level Stress Roadway Floor

针对高水平应力下巷道围岩变形量大、强烈底鼓等特征,利用板模型推导出底板变形破坏的位移公式。并引入底板侧压系数,说明在高水平应力下巷道更容易产生严重底鼓。同时,以文家坡矿41盘区二号回风巷为数值模拟背景,利用FLAC^(3D)建立巷道底板无深孔爆破和有深孔爆破2种计算模型。综合分析得:当巷道处于高水平应力下时,深孔爆破卸压技术对底鼓防治成效明显。

In view of the large deformation of roadway surrounding rock and strong floor heave under high horizontal stress, the displacement formula of deformation and failure of floor is derived by plate model. And the side pressure coefficient of floor is introduced, which shows that the roadway is more likely to produce serious floor heave under high horizontal stress. At the same time, with the numerical simulation background of No. two return lane in the 41 plate area of the Wenjiapo mine, 2 calculation models of no deep hole blasting and deep hole blasting in the roadway floor are established by using FLAC^3D. The comprehensive analysis shows that when the roadway is at a high level of stress, the deep hole blasting pressure relief technology has a significant effect on the floor heave control.