A Study of the Laws of Abnormal Gas Emissions and the Stability Controls for Coal Mine Walls in Deeply Buried High-Gas Coal Seams

Table 5

Shear strength index under different moisture content conditions.

No.	Water content (%)	S1 (kPa)	S2 (kPa)	S3 (kPa)	S4 (kPa)	Cohesion c (kPa)	tanφ	Angle of internal friction (°)
1	2.02	9.353	16.056	31.566	60.404	0.246	0.156	8.889
2	2.79	8.963	15.004	30.592	58.066	0.491	0.153	8.699
3	5.23	8.379	16.173	30.865	60.404	1.161	0.148	8.430
4	7.09	9.548	15.978	32.735	60.599	2.126	0.147	8.368
5	7.81	7.338	13.364	27.876	51.366	1.285	0.126	7.204
6	9.02	7.989	16.757	31.176	65.081	1.713	0.144	8.194
7	9.13	8.689	13.835	30.787	55.773	1.624	0.137	7.790
8	11.03	8.574	16.562	29.618	63.522	1.850	0.147	8.340
9	13.16	8.768	15.393	30.592	61.963	1.364	0.144	8.205
10	13.37	7.775	12.471	28.059	50.806	1.339	0.125	7.125
11	13.47	8.311	12.471	29.618	53.178	1.277	0.131	7.480
12	15.02	8.963	15.588	29.812	59.235	0.491	0.153	8.699
13	15.56	5.266	13.250	27.669	48.453	0.811	0.122	6.950
14	18.83	7.529	13.250	27.669	54.387	0.382	0.135	7.694