Table 7 Concurrent causal combinations consisting of two sources inducing collapse.
No | Symbol | Concurrent causal combination | ||
|---|---|---|---|---|
Source 1 | Source 2 | Accident | ||
1 | (S1, S2)-A1 | Faults | Shallow cover depth | Collapse |
2 | (S1, S3)-A1 | Faults | Mixed ground | |
3 | (S1, S4)-A1 | Faults | Cross-passage | |
4 | (S1, S5)-A1 | Faults | High water pressure | |
5 | (S2, S3)-A1 | Shallow cover depth | Mixed ground | |
6 | (S2, S4)-A1 | Shallow cover depth | Cross-passage | |
7 | (S2, S5)-A1 | Shallow cover depth | High water pressure | |
8 | (S3, S4)-A1 | Mixed ground | Cross-passage | |
9 | (S3, S5)-A1 | Mixed ground | High water pressure | |
10 | (S4, S5)-A1 | Cross-passage | High water pressure | |
