Gas Seepage Model and Experiment Based on Bedding Effect of Fractured Coal Body

Table 7

Gas concentration of parallel bedding and vertical bedding drilling boreholes.

Ged (d)	Gc (%)		Ged (d)	Gc (%)		Ged (d)	Gc (%)		Ged (d)	Gc (%)
	Pd	Vd		Pd	Vd		Pd	Vd		Pd	Vd
1	39.43	53.22	21	5.81	7.47	11	36.94	49.86	31	53.12	75.95
2	39.84	53.78	22	12.45	17.43	12	34.03	45.94	32	59.35	82.59
3	39.01	52.66	23	17.43	24.07	13	31.54	42.58	33	64.74	87.64
4	40.26	54.34	24	23.66	31.96	14	28.22	38.1	34	68.89	84.23
5	40.67	54.9	25	28.22	38.6	15	24.9	33.62	35	67.65	86.71
6	39.84	53.78	26	31.96	45.65	16	22.41	30.25	36	68.89	87.11
7	40.26	54.34	27	35.28	51.88	17	19.51	26.33	37	67.65	85.12
8	41.09	55.46	28	39.01	57.69	18	16.19	21.85	38	67.23	87.63
9	39.84	53.78	29	43.58	63.08	19	11.21	15.13	39	68.06	85.42
10	39.01	52.66	30	46.9	68.48	20	6.23	8.4	40	68.89	83.45

Notes. Ged – gas extraction days, Gc – gas concentration, Pd – parallel bedding drilling, and Vd – vertical bedding drilling.