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Investigation of Longwall Gateroad Roof Support Characteristics At Powhatan No. 4 Mine.
MISSING :9 pages
This Bureau of Mines publication describes the plan used to instrument two longwall gateroads at the Powhatan No. 4 Mine of the Quarto Mining Company Vibrating wire stressmeters, flatjack u-cells, multipoint extensometer stations, and convergence stations were installed in or on the coal pillars, roof bolts, and roof strata of the gateroad entries. The instruments measure pillar stresses, bolt loadings, and strata movements as the gateroad entries are developed and the longwall panel(s) is mined. The report details only the instrumentation plan of the longwall gateroads and not the evaluation of any subsequent data. This is because a complete analysis of the data cannot be made until extraction of the longwall panel(s) is complete.
IH; Report of Investigations
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division