Mechanical Roof Pulling Technique for Evaluating the Effectiveness of Roof Bolting Systems.
Proc AIME Ann Meeting Dallas Tex Feb 23-28 1974 SME Preprint 74-Am-71, 1974 Feb; :21 pages
The federal Bureau of Mines has been developing the mechanical roof pulling technique as a method for evaluating the effectiveness and the comparative advantages and disadvantages of various roof bolting systems, based on the characteristic responses of bolted mine roofs to a prescribed external loading system. Preliminary experiments were conducted in the Bureau's safety research coal mine using a 12- foot- and a 16-foot-span test rig. The experiments have proved the capability of the test rigs and suggested the viability of the test method. This paper summarizes the test concept and the experimental results.
Proc. AIME Ann. Meeting, Dallas, Texas, Feb. 23-28, 1974, Sme Preprint No. 74-Am-71, Feb. 1974