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
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