Abstract
The stability of an underground coal mine is highly influenced by the regional and local geologic conditions. Certain geologic features have an effect on roof and floor stability. A method of engineering geological data collection involves engineering geological mapping, diamond-core drilling, geotechnical logging, borescope observations, integral sampling of floor strata, and in-situ stress measurements. Individual aspects of the method were developed and tested during the course of field investigations at three Pennsylvania and West Virginia coal mines. The field investigations were supplemented with laboratory testing of rock and coal specimens and regional geologic studies involving lineament and hazard analyses. The method of engineering geological data collection wa found to be effective for quantifying geologic conditions in parameters directly applicable to engineering design. End_of_Article - Last_Page 1458------------
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