Study on the Fractal Characteristics of Coal Body Fissure Development and the Law of Coalbed Methane Migration of around the Stope

Table 3

Actual construction parameters of upper drilling field.

No.1 high location drilling field						No.2 high location drilling field
No.	ND	HD	D	A	DA	No.	ND	HD	D	A	DA
1	22.61	5	100.5	275.7	13	1	20	5.5	143	269	3.5
2	20.90	13	100.5	278	12	2	19.5	10.9	143.5	271	3
3	21.64	21	100	283	12.5	3	20.5	18.7	141	274	3
4	18.31	29	100.5	289	10.5	4	20.4	26.6	142.5	277	2.5
5	20.80	35	126	273	9.5	5	17.6	26.4	96	278	2
6	22.57	9	130	276	10	6	23.5	32.9	106.5	281	4.5
7	21.46	17	130	280	9.5	7	16.6	3.7	100.5	266	5.5
8	20.34	25	130	284	9	8	17.8	11.9	90	270	5
9	13.12	31	100.5	274	7.5	9	19.5	18.5	98.5	274	4.5
10	15.17	40	124.5	280	7	10	16.4	27.8	92	279	4
11	10.71	41	101.9	286	6	11	15.5	33.2	93.5	282	3

ND: normal distance is the vertical distance between the axial end position of the high-level borehole and the top boundary of coal seam No.8, ; HD: the horizontal distance is the vertical distance between the projection point of the high-level borehole in the horizontal plane and the lane of the return air passage of the working face, ; D: depth, ; A: azimuth, °; DA: dip angle, °.