Download or read book Geology of Roof Falls in Kentucky Coal Mines written by Stephen F. Greb and published by . This book was released on 1988 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reference List of Published Information on the Geology of Underground Coal mine Roof Falls written by Stephen F. Greb and published by . This book was released on 1988 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hillseam Geology and Roof Instability Near Outcrop in Eastern Kentucky Drift Mines written by Gary P. Sames and published by . This book was released on 1989 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Relation of Geology to Mine Roof Conditions in the Pocahontas No 3 Coalbed written by Noel N. Moebs and published by . This book was released on 1982 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geologic Hazards and Roof Stability in Coal Mines written by Gregory M. Molinda and published by . This book was released on 2003 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geologic Factors in Coal Mine Roof Stability written by Noel N. Moebs and published by . This book was released on 1984 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Coal Mine Roof Rating CMRR written by Gregory M. Molinda and published by . This book was released on 1994 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Coal Mine Roof Instability written by Noel N. Moebs and published by . This book was released on 1986 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Statistical Analysis of Roof Falls in Eastern Kentucky Coal Mines written by Richard Truett Wilson and published by . This book was released on 1983 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several physical and mechanical parameters associated with 250 roof falls in 5 room-and-pillar mines of Martin, Pike, and Floyd Counties in eastern Kentucky were analyzed using multiple linear and forward stepwise regression, corrected for multiple comparisons, as well as discriminative analyses. Arch-shaped mine roof falls were associated with thicker first immediate roof beds and smaller widths of fallen debris. Laminar-shaped roof falls were discriminated by thinner coal seams, wider pillar widths, and deeper coal seams. Dome-shaped roof falls were significantly predicted by thicker coal seams, shallower coal seam depths, and smaller frequency of continuous miner operation during the roof fall. The size of the roof falls were associated with thicker immediate roof beds, location of entries, a predominance of shales, greater distance from the nearest working face and greater presence of cracks before the actual fall. In general, a strong relationship was found between the time of the roof fall, distance from the working face, the amount of sloughing of coal ribs, the number of cracks in the roof, the pressure of water, the length of time between coal excavation and the roof fall, and the type and number of resin bolts used. The presence of sloughing of the coal ribs was predicted by the increase of the distance of the roof fall from the face, the increase of the length of time after coal excavation, and decrease in the use of resin bolts. In addition, trend surface analyses was performed on two selected parameters from one mine site. It was determined from the trend that for the volume of a roof fall, the fifth order trend surface was the best fit, but when using the thickness of the first immediate layer the fourth order trend was the best fit.

Download or read book Kettlebottoms written by Frank E. Chase and published by . This book was released on 1983 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Roof Control of Stress relief Jointing Near Outcrops in Central Appalachian Drift Coal Mines written by Gary P. Sames and published by . This book was released on 1992 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rating the Strength of Coal Mine Roof Rocks written by Gregory M. Molinda and published by . This book was released on 1996 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geology in Coal Resource Utilization written by American Association of Petroleum Geologists. Energy Minerals Division and published by . This book was released on 1991 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cutter Roof Failure written by Eric R. Bauer and published by . This book was released on 1990 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Geology and Mineral Resources of Part of the Cumberland Gap Coal Field Kentucky written by George Hall Ashley and published by . This book was released on 1906 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book List of Bureau of Mines Publications and Articles with Subject and Author Index written by United States. Bureau of Mines and published by . This book was released on 1990 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report of Investigations written by and published by . This book was released on 1989 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: