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

Table 1

The coordinate of measurement points with different face advances of the lower coal seam (part).

	0 m		80 m		90 m		100 m
	The point in the upper coal seam
Coordinate	x	y	x	y	x	y	x	y
1	214.108	63.6643	214.155	63.9295	214.413	63.4949	214.38	63.587
2	203.727	63.7489	203.775	63.9214	203.937	63.4949	203.992	63.587
3	193.957	63.6643	194.005	63.829	194.159	63.4949	194.214	63.587
4	184.013	63.7489	184.06	63.9062	184.294	63.6643	184.262	64.0109
5	173.981	63.6643	174.029	63.8985	174.167	63.9182	174.312	65.0283
6	163.601	63.5796	163.561	63.8055	163.69	64.0029	163.662	65.4522
7	153.569	63.6643	153.703	63.8828	153.913	64.5109	153.884	65.1978
8	143.886	63.8336	143.933	63.9602	144.222	64.0029	144.105	64.6891
9	134.029	63.8336	134.076	64.0375	134.27	63.7489	134.239	64.1804
10	124.259	63.7489	124.306	63.945	124.492	63.7489	124.46	63.7565
11	114.663	63.4949	114.711	63.598	114.889	63.4103	114.769	63.4174
12	104.195	63.7489	104.243	63.8446	104.413	63.5796	104.293	63.6717
13	94.6869	63.8336	94.6471	63.8372	94.7222	63.6643	94.6901	63.6717
14	84.9169	63.7489	84.9643	63.8297	85.0317	63.4949	84.9995	63.587
15	75.4086	63.6643	75.456	63.7375	75.5159	63.4949	75.5709	63.587
16	65.2026	63.4949	65.337	63.475	65.3889	63.3256	65.3561	63.3326
17	55.4324	63.6643	55.4798	63.7221	55.6111	63.4103	55.5787	63.5022
18	45.5751	63.8336	45.7098	63.8843	45.746	63.6643	45.6267	63.6717
19	35.2814	64.1722	35.3291	64.2159	35.3571	64.0029	35.326	64.0957
20	26.558	64.4262	26.6059	64.4639	26.627	64.1722	26.5962	64.2652
21	15.916	63.9182	16.0508	63.8614	15.9762	63.6643	16.0316	63.7565
22	4.92446	64.2569	4.97224	64.1925	4.97619	64.0029	4.94507	64.0957