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Keywords: square pillarClose
Publisher: American Rock Mechanics Association
Paper presented at the The 18th U.S. Symposium on Rock Mechanics (USRMS), June 22–24, 1977
Paper Number: ARMA-77-0334
... safety factor of about 1.0, since the compressive strength of rock salt is generally assumed to be around 5,000 psi. extraction ratio convergence measurement roof failure entry 32 test panel dolomite safety factor pillar safety factor square pillar shale feet square pillar load mining...
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