Study on Failure Characteristics and Reasonable Mining Parameters of Upward Mining of Integrated Coal Mine

Table 2

Plastic zone width of roadway surrounding rock with different open-off cut position.

(a)

Working face advanced distance/m	Open-off cut position advanced to 300 m
	Belt roadway/m			Track roadway/m			Return air roadway/m
	Roof	Two sides	Floor plate	Roof	Two sides	Floor plate	Roof	Two sides	Floor plate
0	0	0	0	0	0	0	0	0	0
40	13	12	13	52	75	57	59	78	63
80	42	20	41	86	81	69	90	87	72
120	64	26	58	91	86	82	95	92	83
160	68	29	62	94	93	94	98	97	98
200	67	27	63	92	94	93	100	97	96
240	67	25	62	93	95	93	99	97	96

(b)

Working face advanced distance/m	Open-off cut position advanced to 340 m
	Belt roadway/m			Track roadway/m			Return air roadway/m
	Roof	Two sides	Floor plate	Roof	Two sides	Floor plate	Roof	Two sides	Floor plate
0	0	0	0	0	0	0	0	0	0
40	3	3	7	29	41	33	33	39	37
80	8	5	18	38	52	42	43	48	48
120	24	9	28	43	56	50	49	53	55
160	36	14	33	60	62	58	65	66	64
200	36	15	32	61	62	58	64	65	63
240	35	14	32	61	62	57	63	65	63

(c)

Working face advanced distance/m	Open-off cut position advanced to 380 m
	Belt roadway/m			Track roadway/m			Return air roadway/m
	Roof	Two sides	Floor plate	Roof	Two sides	Floor plate	Roof	Two sides	Floor plate
0	0	0	0	0	0	0	0	0	0
40	2	4	6	28	37	31	30	34	38
80	7	7	16	39	48	43	42	43	47
120	21	10	24	45	53	49	51	48	53
160	33	12	31	62	59	59	67	63	63
200	34	14	33	62	60	58	66	65	64
240	33	14	32	60	59	58	65	65	64