Table 6 Calculated YAI values of rock pillar under different RPT/TD.
From: Stability evaluation of rock pillar between twin tunnels using the YAI
RPT/TD | YAI | |||
|---|---|---|---|---|
Left–right tunnels | Up-down tunnels | |||
I | II | III | IV | |
1/4 (RPT = 1.5 m) | 0.539 | 0.295 | 0.862 | 0.656 |
1/3 (RPT = 2 m) | 0.590 | 0.395 | 0.873 | 0.699 |
1/2 (RPT = 3 m) | 0.658 | 0.527 | 0.885 | 0.753 |
2/3 (RPT = 4 m) | 0.697 | 0.606 | 0.895 | 0.799 |
1 (RPT = 6 m) | 0.738 | 0.689 | 0.891 | 0.862 |
