Progress in the development of a microseismic roof fall warning system.
Proceedings of the 10th Annual Institute on Coal Mining Health, Safety and Research, Blacksburg, Virginia, August 28-30, 1979. Shaw CT, ed. Blacksburg, VA: Virginia Polytechnic Institute and State University, 1979 Aug; :177-199
The time-honored methods for examining roof stability are to listen to the rock working or to sound the roof with a bar. The primary sensor involved is the human ear. From a technical standpoint, the ear has excellent dynamic range, but its frequency response is limited and nonuniform. Considerable experience is required before this sensory information can be used to make a reasonable assessment of the roof condition. The goal for the Bureau's Automatic Roof Fall Warning System is essentially to extend and improve the range of the sensor and to process the information and present it in a readily usable form to provide warning of impending roof falls. The system described in this paper is a passive system in that it "listens" to the rock working as the mine structure adjusts to stresses caused by ore removal or other factors. This system does not necessarily replace active methods such as sounding the roof with a bar.
Coal-miners; Coal-mining; Miners; Mine-workers; Mining-equipment; Mining-industry; Monitoring-systems; Underground-miners; Underground-mining; Rock-falls; Room-and-pillar-mining; Slope-stability; Ground-stability; Warning-systems; Warning-devices; Structural-analysis; Monitoring-systems
Proceedings of the 10th Annual Institute on Coal Mining Health, Safety and Research, Blacksburg, Virginia, August 28-30, 1979