Analysis of Dynamic Evolution of Surrounding Rock Movement and Stress-Fracture in the Upward and Repeated Mining of Close-Distance Coal Seams

Table 2

The ratio among the relative length of the measuring points with different face advances of the lower coal seam.

Points	80 m	90 m	100 m	120 m	140 m	160 m	180 m	200 m
	Ratio	Ratio	Ratio	Ratio	Ratio	Ratio	Ratio	Ratio
1	0.986227	0.991585	1.001381	0.993012	0.993171	1.001492	0.992976	1.002915
2	1.002746	1.000025	1.018016	1.009878	0.992911	1.001311	1.001159	1.011141
3	1.0113	0.999998	1.00998	1.001623	1.001566	1.002161	1.001644	1.011797
4	1.071452	1.076606	1.061126	1.052325	1.052579	1.060914	1.052489	1.062586
5	1.156053	1.144218	1.052285	1.060857	1.052418	1.069254	1.052369	1.062559
6	1.154608	1.134492	1.026889	1.018321	1.009927	1.009866	1.018314	1.019789
7	1.067335	1.031986	1.017361	1.017442	1.009288	1.001326	0.993215	1.010721
8	1.011698	1.026476	1.045404	1.019023	1.010238	1.01026	1.010237	1.020545
9	0.985278	0.991221	1.010151	1.010492	0.992588	1.001668	0.99267	0.99412
10	0.994169	0.97403	0.992815	1.045553	1.001525	0.992831	0.984029	1.00291
11	0.994537	0.983325	1.001505	1.034967	1.018155	1.009815	1.009837	1.002941
12	0.994242	1.000103	1.001422	1.010063	1.053311	1.018791	1.010396	1.011501
13	1.020056	1.008452	1.018573	1.01858	1.044458	1.03583	1.027175	1.02872
14	0.985861	0.991477	1.001399	0.992908	0.992919	1.009885	1.001407	1.002858
15	1.002897	1	1.001465	0.992892	1.010021	1.027312	1.010145	1.002907
16	1.011309	1.00002	1.018425	1.001472	1.010078	1.018286	1.035378	1.028602
17	0.994203	1.008706	1.010197	0.992877	1.001426	1.001472	1.018891	1.020352
18	1.003143	1.009023	1.009969	1.001725	1.001379	1.001668	1.010021	1.020771
19	1.002867	1.000276	1.001364	0.992785	1.001372	1.001382	0.992518	1.021943
20	0.993742	1.009446	1.001339	1.001419	1.001343	1.001071	1.001448	1.021107
21	1.003254	1.008565	1.001728	1.001842	1.00221	1.001764	1.011009	1.003336
22	1.002854	1.008815	1.010198	1.010276	1.010202	1.019071	1.001841	1.011769