A borehole instrument for measuring mining induced pressure changes in underground coal mines.
Bauer-ER; Chekan-GJ; Hill-JL III
Proc 26th U S Rock Mechanics Symp, Rapid City, SD, June 26-28, 1985, 1985 Jun; 2:1075-1084
The Bureau of Mines Pittsburgh Research Center has been using a simple and inexpensive instrument for measuring mining-induced pressure changes in coal pillars and mine roof. The instrument, the borehole platened flatjack (bpf), is a copper flatjack (bladder) positioned between aluminum platens. It is calibrated in a simulated coal or coal measure rock medium prior to in-mine installation. Laboratory tests have shown the bpf to be repeatable and reliable and that the relationship between gauge pressure and strata pressure is dependent on the initial setting pressure. Field tests have shown that the bpf is easily installed and that it effectively indicates mine areas experiencing increasing or decreasing pressures.
Mining-industry; Measurement-equipment; Analytical-instruments; Pressure-testing; Room-and-pillar-mining; Coal-mining; Laboratory-testing; Testing-equipment; Underground-mining
Proc 26th U.S. Rock Mechanics Symp, Rapid City, SD, June 26-28, 1985