By applying theoretical calculation and computerized numerical simulation,this article carries out a study on the slicing mining technology used in extra coal seams from the aspects of determination of width of coal pillars in the upper and lower seams,arrangement of slice drifts,arrangement of coal mining equipment withdrawal roadways and the mining methods used in the lower seam,etc.

In order to find out how the branch structure affected the characteristic of shockwave propagation,LS-DYNA software was used to compute,and simulate certain shockwave propagating through the branch tunnels with different angle,and the overpressure/momentum(ratio)bench mark to measure "plane wave" was proposed.