Cause and Prevention of Failure of Freshly Exposed Shale and Shale Materials in Mine Openings.
Bobeck GE; Clifton DF
NTIS: PB/232-891 Available for Reference At Bureau Libraries :116 pages
This research (Contract No. G0111809) was performed to determine the mechanism by which coal mine roof rocks interact with the mine atmosphere and weaken and, coupled with the mechanical stresses, ultimately fail. The scope of the study was limited to the effects of environmental factors on the deterioration of rocks. Samples were obtained from several coal mines in the Western States. The rocks forming the roofs of most of the mines visited were shales of varying composition. These shales were subjected to tests to determine how the rocks changed with time after exposure. In addition, the identity of the minerals present in the shales was determined by x-ray diffraction and thermal analyses as well as by optical microscopy. The results of the survey show that there is little known on the exact causes of coal mine roof rock failure. For this reason, only those references that pertain directly to a specific topic are cited in the text; the remainder are in the bibliography.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB/232-891; Available for Reference At Bureau Libraries
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