Study on Deformation and Fracture Evolution of Underground Reservoir Coal Pillar Dam under Different Mining Conditions

Table 5

Orthogonal experiment range analysis Tab. (maximum vertical deformation).

Factor	Length of working face/m	Width of coal pillar/m	Mining height/m	Water pressure/MPa
Average results of the first level	0.58	0.77	0.70	0.92
Average results of the second level	0.79	0.82	0.78	0.91
Average results of the third level	0.99	0.89	0.90	0.83
Average results of the fourth level	1.07	0.94	0.96	0.77
Range	0.50	0.17	0.26	0.15