Research on a Numerical Simulation and Prediction Model of Floor Mining Failure Depth in the Chenghe Mining Area

Table 4

Error analysis of field measured values and fitting values of the working face floor failure depth in different mining areas.

Comparison types	Average value of in situ measurement (m)	Average value of fitting (m)	Error mean (m)	Error percentage (%)	Error variance	Mean square error
Fitting formula (1)	9.57	8.73	1.40	16.88	1.23	1.11
Fitting formula (2)	9.57	8.68	1.37	16.47	1.11	1.05
Statistical formula (3)	9.57	10.78	2.49	26.25	3.57	1.89
Statistical formula (4)	9.57	11.23	2.39	25.18	3.76	1.94
Statistical formula (5)	9.57	8.40	2.34	28.63	2.69	1.64