Question
Geomechanics and Ground Control Question on Roof supporting systems
| The roof convergence data for 30 days at a monitoring station in a coal mine gallery is given. Day | Convergence reading (mm) |
|---|---|
| 0 | 0 |
| 5 | 4.7 |
| 10 | 11.3 |
| 16 | 19.6 |
| 22 | 28.8 |
| 30 | 34.8 |
| The management decides on a Trigger Action Response Plan (TARP) if the following two premises occur simultaneously. | |
| Premise 1: Rate of convergence exceeds 1.5 mm/day between two consecutive measurements. | |
| Premise 2: Rate of cumulative increase in convergence exceeds 1.0 mm/day. | |
| Identify the day on which TARP is enforced in that gallery. |
A
10
B
16
C
22
D
30
Answer
22
Explanation
Solution
The correct option is (C): 22