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July 2015
Volume 67    Issue 7

Room-and-pillar panel design method to avoid surface subsidence

Mining Engineering, 2015, Vol. 67, No. 7, pp. 105-110
Luo, Y.


ABSTRACT:

In designing and operating underground room-and-pillar coal mines, it is always difficult to achieve a good balance between preventing surface subsidence and achieving high recovery ratio. In this paper, a design methodology applying the pressure arch theory is proposed, and the principles and mathematical models involved are detailed. A computer program was developed to carry out the design optimization process and was applied to the examination of a documented case in which a massive cascading pillar failure had occurred over a large area in a shallow coal mine. The results indicate that the proposed design method can be applied to prevent subsidence while achieving reasonably high recovery ratio for roomand-pillar mining operations.



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