GATE Geomechanics and Ground Control: Ground Control – Previous Year Questions
17 GATE previous year questions on Ground Control (Geomechanics and Ground Control, Mining Engineering) with answers and explanations, from every paper.
- GATE 2021 MN Q28 – Which plotted curve represents coal-pillar vertical stress versus extraction ratio R in a horizontal bord-and-pillar panel?
- GATE 2021 MN Q40 – Longwall shields have yield capacity 460 tonnes each, canopy length 3.25 m and width 1.5 m, and setting capacity 80% of yield. Tip-to-face distance…
- GATE 2022 MN Q21 – Which vertical-stress profile shown corresponds to the tributary-area method of pillar design?
- GATE 2022 MN Q33 – A metal-mine drive has roof span 4 m. Using the modified Lauffer chart, find the factor increase in stand-up time when RMR increases from 40 to 60, to…
- GATE 2022 MN Q38 – A three-point borehole extensometer has anchors 1, 2, 3 from deepest to shallowest, as shown. Readings in mm on 2 May 2021 are (34.52, 29.04, 43.11);…
- GATE 2022 MN Q49 – A circular tunnel of radius 3 m is in a hydrostatic field of 15 MPa. Rock E=5 GPa and ν=0.25. Find uniform boundary support pressure in MPa needed to…
- GATE 2022 MN Q50 – A flat bord-and-pillar panel’s extraction ratio increases from 0.15 to 0.25 by widening galleries. Using tributary-area loading, find percentage…
- GATE 2023 MN Q32 – A 150 m wide flat longwall panel reaches critical subsidence at depth 200 m. For the same critical width-to-depth ratio, find the corresponding width…
- GATE 2023 MN Q37 – An 8 m diameter tunnel has rock-mass quality Q = 1.0 and excavation support ratio ESR = 1.0. Using the supplied Grimstad–Barton (1993) chart, choose…
- GATE 2023 MN Q48 – Pillar strength is S p=S 1(0.64+0.54w/h-0.18w2/(lh)), with l≥w. A 30 m square pillar of height 3 m is split by a 5 m roadway into two equal pillars.…
- GATE 2023 MN Q62 – The 20 m high rock slope shown has a 45° face and a potential sliding joint at 30°. Rock unit weight is 20 kN/m³, joint cohesion 30 kPa and friction…
- GATE 2024 MN Q39 – Roof convergence readings(day, mm) are(0, 0), (5, 4.7), (10, 11.3), (16, 19.6), (22, 28.8), (30, 34.8). TARP starts when both the latest interval rate…
- GATE 2024 MN Q53 – A flat coal seam lies 250 m deep with vertical stress gradient 0.027 MPa/m. Square-pillar strength is 12.5 MPa. Find extraction ratio giving safety…
- GATE 2025 MN Q39 – A circular tunnel of radius a=3 m receives t=0.3 m shotcrete after5 mm radial convergence. Shotcrete has σc=20 MPa,Ec=15 GPa,ν=0.25. Its capacity is p…
- GATE 2025 MN Q53 – A square coal pillar has35 m centre-to-centre spacing and5 m galleries. It is split by5 m crosscuts into four equal square stooks. Height is3 m. With…
- GATE 2026 MN Q24 – Which curve is the ideal load–deformation characteristic of a hydraulic prop?
- GATE 2026 MN Q49 – A plug dam seals a3.5×2.5 m gallery. Rock–dam interfacial shear strength is1.0 MPa. Find minimum dam thickness resisting10.0 MPa water pressure, in m…