Coal mine floor heave in the Beckley Coalbed: an analysis.
NTIS: PB 279 658, 1978; :1-32
This Bureau of Mines report describes floor heave ground control problems that have been encountered in a new underground coal mine in West Virginia. Previous experience in the coal seam, the results of physical property investigations, and in situ rock stress determinations are discussed. The apparent cause of the ground control problems is the existence of a high, biaxial, horizontal stress field coupled with a floor member that has time-dependent deformation characteristics. A theoretical analysis of the failure process is developed. The analysis is assisted by finite element techniques. Mine design recommendations based on this analysis are presented. The work upon which this report is based was done under a cooperative agreement with the Bureau of Mines, U.S. Department of the Interior, and the Pittston Company.
Mining-industry; Ground-control; Underground-mining; Coal-mining; In-situ-mining; Rock-mechanics
IH; Report of Investigations
NTIS Accession No.
NTIS: PB 279 658