The Relationship between Mining-Induced Stress and Coal Gas under an Optimized Support Scheme: A Case Study in the Guanyinshan Coal Mine, China

Table 3

Monitoring drilling borehole construction parameters.

Construction site	Borehole number	Azimuth angle (°)	Drilling angle (°)	Hole depth (m)	Sealing depth (m)	Construction time
DE-14+60m	d1	1	44	30.66	30	2018.11.10 morning shift
	W1	1	21	36.50	28	2018.11.10 middle shift
DE-15+7m	d2	1	24	36.50	31	2018.11.10 morning shift
	W2	1	47	29.20	24	2018.11.10 morning shift
DE-15+36m	d3	1	39	27.74	26	2018.11.10 evening shift
	W3	1	17	33.58	28	2018.11.10 evening shift
DE-16+3m	d4	1	15	36.50	34	2018.11.9 middle shift
	W4	1	38	29.20	24	2018.11.9 middle shift
DE-16+33m	d5	1	38	27.74	25	2018.11.9 middle shift
	W5	1	15	36.50	30	2018.11.9 middle shift