Practical Pillar Design Problem Encountered Under Deep Cover and With Different Block Geometric Pillar.
Hazen GA; Artler LR; Lewis H; Middaugh J
NTIS: PB/266-705 Available for Reference At Bureau Libraries :113 pages
This report presents a stress investigation of four coal pillars located under two depths of cover. Each coal pillar was instrumented with 10 load cells designed to measure coal pressure during initial and secondary mining. The problem considered was one of uniform triaxial stress as a large coal pillar was loaded under a thick limestone bed. Special attention was given to pillar design procedure. Unconfirmed uniaxial compression tests were conducted. Results show that a coal pillar is composed of an inner zone which is highly loaded plus a region around its perimeter which has lost its elastic strength. The bearing capacity of a coal pillar consists of elastic and crushed coal response. The failure strengths have been determined and will be useful in coal recovery, mine design, and mine safety.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/266-705 Available for Reference At Bureau Libraries
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