GATE MN · 2018 · MN
Question 40: Ground Control
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Question 40
MNNAT2 marksNeeds review
A coal seam lying at a depth of 200 m is developed by bord and pillar method. Pillars are 30 m centre to centre with a gallery width of 4 m. Unit weight of the overlying strata is 28
. If the pillar strength is 9.32 MPa, the factor of safety of pillar is ___________.Log in to check the answer
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2018MN
GATE MN 2018 · Paper 1
Mining Engineering · Original paper archive
- Section
- Mining Engineering
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
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