Experimental Study on Corrosion of Anchored Rock Mass for Half-Through Intermittent Joints
Table 4
Test sequence and test results.
Sequence number
Fracture angle (°)
Current,I (mA)
Time, t (h)
Pitting ratio, δ (%)
Maximum drawing force, F (kN)
Bond strength, τ (MPa)
Bond strength loss rate (%)
A-30
30
—
—
0
20.42
6.83
0.00
A-30-1-48
30
1
48
1.83
18.94
6.33
7.24
A-30-1-72
30
1
72
2.96
18.61
6.22
8.86
A-30-1-96
30
1
96
3.34
18.34
6.13
10.19
A-30-1-120
30
1
120
4.08
17.76
5.94
13.00
B-45
45
—
—
0
20.96
6.99
0.00
B-45-1-48
45
1
48
1.72
18.76
6.26
10.50
B-45-1-72
45
1
72
2.79
18.49
6.17
11.80
B-45-1-96
45
1
96
6.29
17.91
5.98
14.53
B-45-1-120
45
1
120
4.67
17.70
5.90
15.54
C-30
30
—
—
0
21.50
7.19
0.00
C-30-5-48
30
5
48
9.12
15.40
5.15
28.40
C-30-5-72
30
5
72
11.60
13.90
4.65
35.34
C-30-5-96
30
5
96
19.65
12.85
4.30
40.25
C-30-5-120
30
5
120
27.54
11.58
3.87
46.14
D-45
45
—
—
0
19.66
6.56
0.00
D-45-5-48
45
5
48
8.83
15.71
5.24
20.09
D-45-5-72
45
5
72
15.16
14.08
4.70
28.37
D-45-5-96
45
5
96
20.93
12.67
4.22
35.58
D-45-5-120
45
5
120
39.51
11.40
3.80
42.02
Taking A-30-1-48 as an example, A represents different grouping, 30 represents crack angle of 30°, 1 represents loading current of 1 mA, 48 represents loading time of 48 hours. One corrosion-free sample was used as control in each group.
