Effect of Mining Thickness on Overburden Movement and Underground Pressure Characteristics for Extrathick Coal Seam by Sublevel Caving with High Bottom Cutting Height

Table 5

Support working resistances obtained from the material simulation test in coal with a thickness of 9 m.

Face advanced distance (m)	Strain	Support load (MPa)	Model support resistance (kN)	Model height of rock pillar should be controlled, h (cm)	Actual height of rock pillar should be controlled, H (m)	Actual support working resistance (kN)
210	−219	0.16	0.79	9.24	18.47	4616.81
220	−146	0.21	1.07	12.60	25.19	6295.24
230	5	0.33	1.66	19.54	39.08	9767.04
240	−178	0.19	0.95	11.12	22.25	5559.49
250	−152	0.21	1.05	12.32	24.64	6157.28
260	−15	0.32	1.58	18.62	37.24	9307.20
270	131	0.43	2.15	25.34	50.68	12664.05
280	−213	0.16	0.81	9.51	19.03	4754.77
290	−125	0.23	1.15	13.56	27.12	6778.07
300	−138	0.22	1.10	12.96	25.93	6479.17
310	−10	0.32	1.60	18.85	37.70	9422.16
320	−127	0.23	1.14	13.47	26.94	6732.09
330	−21	0.31	1.56	18.35	36.69	9169.25
340	−35	0.30	1.50	17.70	35.40	8847.36
350	126	0.43	2.13	25.11	50.22	12549.09
360	−204	0.17	0.84	9.93	19.85	4961.70
370	−138	0.22	1.10	12.96	25.93	6479.17
380	−15	0.32	1.58	18.62	37.24	9307.20
390	−197	0.17	0.87	10.25	20.50	5122.64
400	−31	0.30	1.52	17.89	35.77	8939.33