Improved Design and Support Techniques for Coal Mine Entry Intersections.
Proc 8th Int'l Strata Control Conf Dusseldorf 1989 May; :20 pages
This U.S. Bureau of Mines paper describes the development of improved design and ground support techniques for coal mine entry intersections to reduce the severity of ground control problems associated with high horizontal stresses and variable geological conditions. Through field investigations and numerical modeling studies, four major parameters that influence the failure behavior of entry intersections were identified: in situ stresses, geological discontinuities, intersection geometry, and diagonal roof span. Three primary design criteria are emphasized: prompt installation of support, control of failure progression, and minimization of diagonal roof span. Conceptual and proven implementations are also discussed.
Proc. 8th Int'l Strata Control Conf., Dusseldorf, May, 1989; Federal Republic of Germany, 20 Pp