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Microcomputer-based Instrumentation System for Monitoring Ground Support in a Deep Mine Shaft.
MISSING :88 pages
This report describes a microcomputer-based instrumentation system for structural monitoring of the circular, concrete-lined silver shaft in northern Idaho. The 1-ft-thick concrete lining and surrounding rock mass were instrumented with a total of 12 multiple- point borehole extensometers, 16 pressure cells, 22 concrete embedment strain gauges, and 12 thermistors. The instruments were distributed among four test sites and installed immediately above the shaft bottom during sinking at the 2414, 4063, 5191, 5955 levels. Limited access to the instruments prompted the development of a microcomputer-based remote data acquisition system that could be operated from the surface. The system scanned the instruments on a programmed schedule, printed out reduced data, and stored the data for plotting and recall. Data acquisition from off-site and uploading of data to mainframe computers were accomplished by the addition of modems to the basic system. The system is suitable for use in monitoring the structural behavior of any deep mine opening especially in harsh operating environments and where access is limited.
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Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division