Shield pressure monitoring to detect longwall ground control hazards.
Conover D; Hanna K
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; :217-226
Continuously monitored shield-leg pressure changes have proven to be an indicator of certain longwall ground control hazards, including high-stress zones along the face and roof falls and floor heave in adjacent gateroads. Anomalous shield pressure behavior has been observed for periods of up to several hours prior to major tailgate bumps and roof caves. The panel-wide distribution of average shield loads and load changes has correlated closely with roof and floor geological structures and gateroad areas experiencing ground control difficulties. Monitoring and analysis of shield load and gateroad stability data have been accomplished using the Ground Control Management System (GCMS) developed by the U. S. Bureau of Mines. The automated capabilities of the GCMS have enabled researchers and mining personnel to remotely monitor geostructural data and evaluate ground stability during the high-speed extraction of four longwall panels in a Colorado coal mine. This paper will emphasize the application of shield load monitoring for detecting and managing developing ground control hazards along the face and in the gateroads.
Monitoring systems; Longwall mining; Underground mining; Ground control; Hazards; Stress; Roof falls; Floors; Behavior; Geologic formations; Coal mines
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