A Large Goaf Group Treatment by means of Mine Backfill Technology

Table 3

Statistical results of goaf volume in 808 m level.

Stop number	Stope position	Stope span (m)	Stope height (m)	Stope thickness (m)	Exposed area of roof (m^2)	Exposed perimeter of roof (m)	Goaf volume (m^3)	Results of stability graph method
808–1#	1–3 line	20	15	10.5	210	61	260.8	Transition zone
808–2#	3–5 line	41	34	9.8	401.8	101.6	638.6	Transition zone
808–3#	5–7 line	42	34	9.5	399	103	646.2	Transition zone
808–4#	7–9 line	41	10	1.5	61.5	85	78.1	Stable zone
808–5#	9–11 line	41	34	8.5	348.5	99	569.5	Transition zone
808–6#	11–13 line	42	34	8	336	100	557.1	Transition zone
808–7#	13–15 line	42	34	7.5	315	99	557.6	Transition zone
808–8#	17–19 line	41	34	12	492	106	Backfilled	Caving zone
808–9#	19–21 line	40	30	5	200	90	327.5	Transition zone
808–10#	21–23 line	40	12	6	240	92	253.5	Transition zone
808–11#	23–25 line	40	34	40	1600	160	3813.3	Caving zone
808–12#	25–27 line	41	34	30	1230	142	2521.4	Caving zone
808–13#	27–29 line	40	30	15	600	110	709.8	Caving zone
808–14#	29–31 line	38	25	3	114	82	76.0	Transition zone
808–15#	31–33 line	39	27	3	117	84	215.8	Transition zone
808–16#	31–35 line	40	27	3	120	86	193.5	Transition zone
808–17#	35–37 line	40	22	3	120	86	319.7	Transition zone
808–18#	37–39 line	38	27	5	190	86	593.4	Transition zone
808–19#	39–41 line	35	34	5	175	80	365.9	Transition zone
808–20#	41–45 line	45	12	8	360	106	Backfilled	Transition zone
808–21#	53–55 line	45	30	30	1350	150	1827.3	Caving zone
808–22#	55–57 line	39	30	20	780	118	1066.0	Caving zone
808–23#	57–59 line	45.1	8	7.5	338.25	105.2	1523.0	Transition zone
808–24#	57–59 line	42	8	7.5	315	99	335.4	Transition zone
808–25#	61–63 line	46	8	3	138	98	1162.2	Transition zone
808–26#	61–63 line	46	8	3	138	98	1097.2	Transition zone
808–27#	65–67 line	45.5	34	6	273	103	3408.0	Transition zone
808–28#	67–69 line	32.4	34	4	129.6	72.8	2113.8	Stable zone
Total	25230.6