| Coal and gas outburst prevention has always been the top priority of mine. Principles of hydraulic flushing technology that outburst out of the role of a number of holes, pre-and gas out of some of the media to undermine the stress distribution of coal, a large release of gas potential, to achieve the effect of AR outburst. Based on the theoretical analysis, computer simulation and test of hydraulic punching combination set Zhu coal mine 11---2 AR hydraulic punching technology of pressure relief. Zhu set mine coal and the small sets 11-211-2 coal seam is very similar, are relatively hard coal, gas content and pressure is relatively small, tunnel roof stress under the weight of a large rock, is caused by the accident highlighted the main factors. By 1111 (1) transport along the bottom face No.1 Union Lane Roadway specific hydraulic punch test results showed that:after the implementation of hydraulic flushing gas extraction increased net capacity from 0.05m3/min 0.39m3/min, The amount of gas extraction in the absence of pure water to 7.8 times when punching. Before punching the gas concentration with 0.8% increase to a maximum of 6.5%. The effective radius of influence of hydraulic punching up to 5.8-6.3 meters. Coal and gas outburst prediction index values are decreased to increase the permeability of coal, gas content, gas pressure and so drastically reduced, the effective realization of the sudden effects of consumption and speed up the security of a prominent coal dangerous driving speed. For the efficient production of coal mine safety has provided a powerful guarantee.Figure [40] Table [16] Reference [59]... |
PDF Full Text Request