Floor Heave Analysis in a Deep Coal Mine.
Proc 27th Us Symp on Rock Mechanics Tuscaloosa, Alabama, 1986 Jun; :520-525
This paper presents an analysis of rapid floor heave in a deep western coal mine. The analysis is based on field measurements, laboratory data, and beam design theory. Factors affecting floor heave, such as mining-induced stress, mine opening size, entry orientation, mine geology, rock physical properties, and gas pressure, are considered. Examination of floor heave in the mine indicates that heaving is primarily caused by deformation of a soft floor member that is subjected to high mining-induced stress. Theoretical analysis of in situ floor stresses resulting from overburden loading indicates that floor failure will occur. The analysis is confirmed by visual observations of floor heave in the mine. Recommendations for mine layout and opening design to control rapid, massive floor heave under these conditions are also presented.
Proc. 27th Us Symp. on Rock Mechanics, Tuscaloosa, Alabama, June 23-25, 1986, PP. 520-525