Gateroads With Yield Pillars for Stress Control.
Proc 4th Conf on Ground Control for Midwestern U S Coal Mines So IllinoisUniv PP 179-194 :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.
Proc. 4th Conf. on Ground Control for Midwestern U.S. Coal Mines; So. Illinois Univ., PP. 179-194