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Precalculation of Subsidences Over Longwall Panels in Northern Appalachian Coal Field.
Proc 1985 SME-AIME Fall Mtg Albuquerque New Mexico, Paper No. 85-404 1985 :17 pages
The specific lithological conditions over the Pittsburgh coalbed, highly resistive limestone and sandstone units with relatively shallow overburden, prevent the use of any predictive method as developed for European conditions. This paper describes the development of a subsidence precalculation methodology suitable to the mining-geological conditions in the Northern Appalachian coalfield. It has been found that due to lithological conditions over the Pittsburgh coalbed, the subsidence coeeficient varies within the area of the subsidence trough. This is different from the European conditions where the subsidence coefficient is considered to be a constant. The effects of lithology, in the form of a variable subsidence coefficient, have been separated for each test site by introducing a correlation between hypothetically homogeneous overburden and existing lithological conditions, while providing for different mining conditions. Field data from 11 Bureau longwall panel studies were used in the regression analysis. For each panel, the characteristics of the variability of the subsidence coefficient along individual profile lines were defined. Regression analysis of the subsidence coefficients from all test sites on the location relative to the edge of the panel has yielded a third degree polynomial equation with a coefficient of correlation of 0.9999. All sensitivity tests have shown good results.
Proc. 1985 SME-AIME Fall Mtg., Albuquerque, NM. Paper No. 85-404
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