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Consider the room and pillar layout with an extraction ratio of 60%. The height of the pillars is 5 meters. Mining occur
Posted: Thu Apr 28, 2022 8:33 pm
by answerhappygod
- Consider The Room And Pillar Layout With An Extraction Ratio Of 60 The Height Of The Pillars Is 5 Meters Mining Occur 1 (25.92 KiB) Viewed 21 times
Consider the room and pillar layout with an extraction ratio of 60%. The height of the pillars is 5 meters. Mining occurs at a depth of 200 m. In addition, the following geotechnical properties were collected: UCS = 85 MPa, GSI = 40 (Q=0.64), mi=20, D=0, square pillars. a) Calculate the average pillar stress. b) Determine Ocm from table. c) Assume a factor of safety of 1.5 and using the Kimmelmann pillar strength formula below, calculate the width of the pillars. a 10.46 UCS pillas = 0 cm H.66 d) Determine the width of the rooms and draw the room and pillar layout for this design. e) Is there a potential problem with cascading pillar failure for this layout?