List of top Geomechanics and Ground Control Questions on Roof supporting systems asked in GATE MN

The roof convergence data for 30 days at a monitoring station in a coal mine gallery is given.
DayConvergence reading (mm) 
00
54.7
1011.3
1619.6
2228.8
3034.8
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. 
In a longwall panel, face is supported with shields of yield capacity 460 tonne per shield. The distance from the canopy tip to coal face is 0.15 m when the support is fully advanced. The depth of web is 0.60 m. The shields are set skin to skin at the face. Length of the canopy of the shield is 3.25 m and width 1.5 m. Setting capacity is 80% of the yield capacity. The setting resistance at the maximum and minimum span of the coal face, in tonne/m\(^2\), respectively are