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Laboratory Experiments to Determine the Roof Behavior of Auger Mining With Aerostatic Support.
MISSING :51 pages
The Bureau of Mines recently devised a method of mining that involves auger mining underground using aerostatic supports; that is, pressurized bladders inserted in the auger holes. Apart from other advantages that the method has to offer for underground productivity and safety, it permits controlled subsidence at the surface. Thus, large differential movements of the surface, which induce damage in structures, are prevented. This report describes model experiments in the laboratory that were conducted to obtain preliminary data for the design of field investigations. The results demonstrated the feasibility of the method and indicated that support pressures of 10 to 18 psi would be adequate for depths up to 1,000 ft and 70 pct recovery. The abutment loads do not exceed those generally encountered in longwall mining.
CP; Final Contract Report;
Engineers International, Inc
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division