A 2m thick coal seam at a depth of 150m below ground surface is planned for extraction using 5.0m room spans and pillars 7.0m square in plan. Assume that the unit weight of the overburden rock is 25 kN/m3 and that pillar strength is locally defined based on experience

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter9: Consolidation

Section: Chapter Questions

Problem 9.3P

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A 2m thick coal seam at a depth of 150m below ground surface is planned for extraction using 5.0m room spans and pillars 7.0m square in plan. Assume that the unit weight of the overburden rock is 25 kN/m3 and that pillar strength is locally defined based on experience by the following equation (where w and h are in metres). SSPP = (7.2 ww^ 0. 46)/(h^0.66)(MPa) Determine the factor of safety against compressive failure of pillars in the planned layout Complete equation is given . Please help Tutor

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