Fig. 20
Energy change diagram of roadway surrounding rock under different mining-excavation positions. This picture shows the distribution of the energy change of the surrounding rock; before the intersection the energy change shows an increasing trend with the indentation of the relative position, and its energy change reaches a peak at the position of the 10m vertical slice after the intersection; then its cut-off peak shows a slow decreasing trend with the increase of the relative distance. The energy dissipation area is mainly concentrated in the left and right gangs, and the energy change area in the right gang of the roadway is larger than that in the left gang.
