Gateroads with yield pillars for stress control.
Tadolini SC; Haramy KY
Proceedings of the 4th Conference on Ground Control for Midwestern U. S. Coal Mines, November 2-4, 1992, Mt. Vernon, Illinois. Chugh YP, Beasley G, eds. Carbondale, IL: Southern Illinois University, 1992 Nov; :179-194
Ground control problems associated with deep coal mines have increased interest in the design of longwall gateroads using yielding pillars. This paper presents a discussion of the yield pillar theory and assesses the stability of gateroads with yield pillar configurations. Case studies were conducted by the U.S. Bureau of Mines in two underground longwall mines using two- and three-entry yielding chain pillar configurations. Analysis indicates that gateroad design using yield pillars can result in less stress concentrations in the entries and may reduce or eliminate some stress-related problems. Yield pillar-based gateroads, however, generally suffer comparatively large roof deformations, especially during second panel mining. The magnitude depends on the physical properties of the coal and surrounding strata.
Underground mines; Coal mines; Pillar mechanics; Pillar design; Ground control; Longwall mining; Room and pillar mining; Roof support systems; Physical properties; Stress
OP; Conference/Symposia Proceedings
Chugh YP; Beasley G
Proceedings of the 4th Conference on Ground Control for Midwestern U. S. Coal Mines, November 2-4, 1992, Mt. Vernon, Illinois