Mechanical Roof Pulling Technique for Evaluating the Effectiveness of Roof Bolting Systems.
Trans Soc Min Eng AIME 1975 Mar; 258:65-68
The 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 for underground coal mines, 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 12-foot-span and 16-foot-span test rigs. 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.
Trans. Soc. Min. Eng., AIME, V. 258, March 1975, PP. 65-68