Subsidence Associated With Single and Multicavities for Underground Coal Gasification

[+] Author and Article Information
J. M. Avasthi, G. J. Harloff

Gulf Research and Development Company, Pittsburgh, Pa. 15230

J. Energy Resour. Technol 104(2), 99-104 (Jun 01, 1982) (6 pages) doi:10.1115/1.3230401 History: Received February 20, 1981; Revised February 09, 1982; Online October 22, 2009


The three-dimensional theoretical development of Berry and Sales [1] has been extended to bring the subsidence predictions into agreement with the British National Coal Board comprehensive set of empirical data. New elastic parameters have been determined to fit the amplitude of the ground level subsidence. An empirical correction factor was developed to account for small cavity width-to-depth ratio cases. This correction is believed to account for incomplete closure for half width-to-depth ratios below 0.3. The theory has also been modified to bring the subsidence profiles into agreement with the foregoing referenced data. The development has been used to predict subsidence for an actual U.S. coal mining case with multiple cavities. The theory was also used to predict subsidence level and profile for a recent Gulf/DOE UCG test conducted in a steeply dipping coal seam near Rawlins, Wyoming.

Copyright © 1982 by ASME
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