study area, in order to simulate the mining Second step RCB 0.53 proce1s.s74of a comple0te.2p7anel, the0.t3w1 o-dimen1s8i.o9n3al section0o.2f 2Figure 4 was42st.6re2tched to establish a three-dimensional model, and the grid was reasonably divided and imported to the FLAC3D ...