The Key Ttechnical Research Of Eliminating Coal-and-gas Outburst Rapidly Of Hydraulic Extrusion

For solve the key technical problem of hydraulic extrusion ,based on the experiment in Dazhong coalmine of Anyang, by theoretical analysis , numerical simulating and testing study ,this paper studied the key technical parameters of hydraulic extrusion and the measure of prevent disallowed gas concentration. Considering the mechanism of eliminating coal-and-gas-outburst and the safety, according to the three guidelines of rational water pressure during hydraulic extrusion, which are breaking and extruding the coal body effectively, injecting lots of water rapidly and not leading to coal-an-gas-outburst, the paper bring forward the method of compute rational infusion pressure. Through testing the breadth of the three stress zones in the frontage of work face, this paper educed the expressions of rational drilling length and packing length of hydraulic extrusion. Based on the influencing radial testing of affusion, the paper ascertained the rational lay way and the number of the boreholes. From the idea of preventing gas from blowing into the roadway directly, the paper put forward a new method——"blocking and drainage"——to prevent disallowed gas concentration in hydraulic extrusion. At the same time, a set of equipment matching with the new method has been developed and it's blocking and drainage effect has been examined. Ground on the result of the key technical research, the industry experiment in Dazhong mine received a remarkable effect that is characterized with low effect checking up exceeding rate, driving speed increasing doubly and no coal-and-gas-outburst happened.This dissertation bring forward a more rational expressions and the method of ascertaining the key technical parameters of hydraulic extrusion, innovate the technique of preventing disallowed gas concentration in hydraulic extrusion, enriched and improved the theory and technique of hydraulic extrusion.