Stability Evaluation of the Goaf Based on Combination Weighting and Cloud Model

Figure 10

Cloud chart of evaluation levels of different indicators: (a) structural types of rock mass X1, (b) geological structure X2, (c) rock mass quality X3, (d) dip angle of ore body X4, (e) goaf volume X5, (f) maximum exposed area X6, (g) height X7, (h) span of mined-out area X8, (i) embedding depth X9, (j) exposure time of goaf X10, (k) mined-out area water X11, (l) adjacent empty area situation X12, and (m) subsequent mining disturbances X13.

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