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STABILITY OF INTERSECTIONS IN ROOM-AND-PILLAR COAL MINING
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STABILITY OF INTERSECTIONS IN ROOM-AND-PILLAR COAL MINING
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Dissertation
STABILITY OF INTERSECTIONS IN ROOM-AND-PILLAR COAL MINING
1982
Overview
The stability of entry intersections is of prime importance in underground mining and civil engineering works since they provide the continuity of vital facets of the operations (e.g., ventilation, transportation, etc.) along various routes crossing one another. The intersections, however, are the structurally weaker regions of underground openings, and roof falls are experienced frequently in these areas. Using the finite-element method of stress analysis, the stability of a number of room-and-pillar coal-mine interactions has been evaluated. The effects of the in situ stress field and the pillar size on the stability have been investigated through a series of parametric studies while the three-way (tee) intersections are compared with the four-way (cross) intersections. According to the results of the three-dimensional analysis, a high horizontal stress field is advantageous for the stability of pillars but not for the roof over entries or over the intersections. Also, it has been noted that large pillars are more stable but they do not improve the stability of the roof to a large extent. Furthermore, for comparable models three-way intersections have yielded a better stability picture than four-way intersections. Finally, the important factors affecting the stability of intersections are discussed, and some design and support guidelines applicable to the intersections of underground excavations are presented.
