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

Table 1

Simulation scheme of orthogonal experiment.

Test	Length of working face/m	Width of coal pillar/m	Mining height/m	Water pressure/MPa
1	100	20	1.5	0.5
2	100	25	2	1
3	100	30	2.5	1.5
4	100	35	3	2
5	150	20	2	1.5
6	150	25	1.5	2
7	150	30	3	0.5
8	150	35	2.5	1
9	200	20	2.5	2
10	200	25	3	1.5
11	200	30	1.5	1
12	200	35	2	0.5
13	250	20	3	1
14	250	25	2.5	0.5
15	250	30	2	2
16	250	35	1.5	1.5