Fig. 19
Energy density variation diagram of roadway surrounding rock under different mining-excavation positions. This picture shows the distribution of energy density change in the surrounding rock; at the vertical slice position 10m after the intersection, its energy density reaches the peak value of 27kj/m3; after the intersection, as the spacing increases, the density change peak value also decreases gradually, and the rate of decline is relatively smooth, showing a progressive decay trend. In the intersection of 0m along the roadway roof location to do horizontal slicing, its energy density influence range of the right gang is obviously larger than the left gang. The energy density change is mainly concentrated in the roadway roof and the right gang, in the working face 80m ahead of the lagging 20m range, the surrounding rock energy change density began to increase rapidly, that is, in the surrounding rock gradually accumulate energy at the same time, plastic deformation is also occurring synchronously.
