Pull Tests as a Measure of Roof Bolt Efficiency and of Roof Bolt Design

CIM Bulletin, 1963

A variety of practical tests have been tried in the mining industry to determine the support properties of mine roof bolts. Such tests include torsion wrench readings, hammer blow tests and the use of plates with built-in tension indicators. This paper gives some details of pull tests with a hydraulic jack, as carried out in coal mines of western Canada.
Keywords: bolt, Canada, hydraulic jack, hydraulic pump, Test No. Anchorage Length Torque, Bolts, Load, Mine, Mines, Shell, Strength, test, Tests, Yield