Development of an integrated monitoring system for evaluating roof stability.
Maleki H; Ibrahim W; Jung Y; Edminster P
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; :255-271
Cooperative research between U.S. Bureau of Hines and Colorado School of Hines investigators has resulted in the development of a seismic system to evaluate roof stability in underground mines. After considering seismic, electrical resistivity, gravity/magnetic, and electromagnetic methods, a crosshole seismic method was chosen as the best means of detecting roof stability problems in sedimentary rocks. This choice was based on (1) evaluation of degree of resolution and depth of penetration for every geophysical technique considered and (2) an analysis of failure mechanisms in U.S. mines where significant deformation and changes in rock mass properties have occurred over time. After a review of geologic, geophysical, and rock mechanics data from four mines, a field site was selected near Green River, WY. An instrumentation plan was developed for monitoring strata movement, pillar stresses, and changes in material properties during both development and retreat mining. This program was designed to complement seismic data with a precise picture of strata movement, fracturing, and stress distributions. Field testing of this integrated system has been completed.
Monitoring systems; Underground mines; Ground stability; Ground monitoring; Roof support systems; Gravitational forces; Magnetic fields; Electrical resistance; Rock mechanics; Geologic formations; Geologic strata; Strata control; Fracturing
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