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A rectangular 12m x 9m coal pillar is located 100m below surface. Panel road widths are 7m, mining height is 2.5m. Panel encounters a dolerite sill and the load increases by 15%. i. Calculate the load and safety of the pillar.  ii. Calculate the thickness of the dolerite sill and new safety factor. iii. Discuss the controllable parameter/s in regards to enhancing the stability of the beam in the roof.

A rectangular 12m x 9m coal pillar is located 100m below surface. Panel road widths are 7m, mining height is 2.5m. Panel encounters a dolerite sill and the load increases by 15%. i. Calculate the load and safety of the pillar.  ii. Calculate the thickness of the dolerite sill and new safety factor. iii. Discuss the controllable parameter/s in regards to enhancing the stability of the beam in the roof.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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A rectangular 12m x 9m coal pillar is located 100m below surface. Panel road widths are 7m, mining height is 2.5m. Panel encounters a dolerite sill and the load increases by 15%.

i. Calculate the load and safety of the pillar. 

ii. Calculate the thickness of the dolerite sill and new safety factor.

iii. Discuss the controllable parameter/s in regards to enhancing the stability of the beam in the roof. 

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