METHOD FOR WORKING MINING Russian patent published in 1996 - IPC

FIELD: mining. SUBSTANCE: boreholes are drilled on the space from production face equal to 3 - 5 wavelength of the main irradiative oscillation frequency. Elastic-viscous body is put into the boreholes. Sources of vibration effect are placed in the boreholes. Step-by-step vibration effect is carried out using the sources towards the direction the main maximum stress acts to. First 60 to 150 Hz frequency is applied. Then frequency equal to rock eigenfrequency is applied until stress is achieved equal to 0.7 - 0.9 one of rock fracture stress. Then blast holes are charged and fired. Then vibration sources proceed with effect on the rock at frequency equal to the rock eigenfrequency. This step is under way until stress equal to 0.5 of fracture stress is achieved. Reinforcing resin is injected in the rock when the stress is maintained at the achieved level. Elastic-viscous body is used to fill the boreholes with vibration sources. Acoustic hardness of the body is equal to acoustic hardness of the rock. EFFECT: high stability of mining. 1 cl, 1 dwg