Surface Subsidence Control during Deep Backfill Coal Mining: A Case Study

Table 2

Parameters for surface movement induced by fully caving coal mining.

Number	Measuring line	Working area	Width (m)	Gap (m)	Thickness (m)	Stopping time	Observation time				s	relative error (%)
1	East-west measuring line in working area 1301	1301	215	220	2.77∼3.45	2005.10∼2006.11	2005.12∼2008.11	0.52	2.10	0.46	0	−0.36
		1302	210	220	3.67	2006.12∼2007.08	2005.12∼2008.11	0.65	2.15	0.49	0	0.84
2	South-north measuring line in working area 1302	1302	210	220	3.67	2006.12∼2007.8	2007.01∼2009.05	0.53	2.30	0.76	30/0.032H	−0.58
3	South-north measuring line in working area 1304	1304	150	130	4.97	2008.01∼2008.11	2008.08∼2009.10	0.44	2.05	0.3	45/0.05H	−0.52
4	South-north measuring line in working area 1305	1305	130	130	3.45∼6.5	2010.08∼2011.05	2010.07∼2011.03	0.32	1.65	0.38	50/0.05H	0.32
5	East-west measuring line in working area 2301∼2307	2307	210	100	3.48∼3.75	2007.11∼2008.07	2006.06∼2010.08	0.53	2.35	0.48	0	−0.36
	South-north measuring line in working area 2301∼2307	2307	210	100	3.48∼3.75	2007.11∼2008.07	2006.06∼2010.08	0.60	2.25	0.5	0	0.42
		2305	120	100	2.93∼3.42	2008.11∼2009.05	2006.06∼2010.08	0.50	2.25	0.5	0	−1.32
	East-west measuring line in working area 2303∼2309	2307	210	100	3.48∼3.75	2007.11∼2008.07	2007.12∼2011.03	0.65	2.25	0.5	0	0.45
		2305	120	100	2.93∼3.42	2008.11∼2009.05	2007.12∼2011.03	0.60	2.25	0.5	0	0.27
		2304	120	100	3.04	2009.03∼2009.12	2007.12∼2011.03	0.60	2.25	0.5	0	0.32
	South-north measuring line in working area 2303∼2309	2308	200	0	3.57∼3.76	2009.10∼2010.08	2007.12∼2011.03	0.78	2.25	0.5	0	3.52
		2307	210	100	3.48∼3.75	2007.11∼2008.07	2007.12∼2011.03	0.78	2.25	0.5	0	3.52
		2306	120	100	3.3∼3.32	2009.09∼2010.04	2007.12∼2011.03	0.65	2.25	0.5	0	0.54
		2305	120	100	2.93∼3.42	2008.11∼2009.05	2007.12∼2011.03	0.65	2.25	0.5	0	0.54
		2304	120	100	3.04	2009.03∼2009.12	2007.12∼2011.03	0.65	2.25	0.5	0	0.37
6	South-north measuring line in working area 4304 and 4305	4305	120	100	3.2	2008.09∼2009.02	2008.10∼2010.02	0.45	1.70	0.41	0	−0.59
	Measuring line on Jiliang highway 4304 and 4305	4304	120	100	3.09∼3.12	2009.06∼2010.06	2009.05∼2011.05	0.50	1.80	0.37	0	−0.49
		4305	120	100	3.2	2008.09∼2009.02	2008.10∼2010.02	0.50	1.80	0.37	0	−0.49