| Hydraulic extrusion is a recent development of hydraulic change of coal and gas outburst prevention and control measures. Through some gas coal mine scene test application shows that the measure has a small amount of construction project, school inspection which is low, outburst prevention effect is obvious, underground work environment have been improved obviously, etc.Based on this review hydraulic punching and hydraulic fracturing, hydraulic flushing and coal seam affusion outburst prevention technique etc, this paper elaborates on the basis of hydraulic extrusion technology and the difference of the hydraulic measures. Use mine rock fluid mechanics, mechanics of elasticity, hydromechanical coupling theory and elastoplastic damage mechanics theory knowledge, hydraulic extrusion process of destruction rule of coal was studied, illustrates the mechanism of hydraulic extrusion control gas. In the study of influence of hydraulic extrusion technology parameters based on seepage - stress, using theory of coupling, established in coal -- stress rupture process seepage, with the help of the coupling model -- damage numerical simulation software of high pressure water injection RFPA2D under the action of coal injection hole around broke and coal extrusion process of water stress, displacement pressure distribution field, acoustic launch site, displacement vector field and coal under the role in hydraulic permeability regulation simulation. In Hebi coal group of China and Thai mining company (Hebi fourth mine) the actual measuring gas parameters and validity of inspection parameters, combined with the simulation software based on simulated RFPA2D waterflood effect, access to certain research results,and corresponding conclusion. In Hebi coal group of China and Thai mining company (Hebi fourth mine) underwent hydraulic extrusion scene tests, the reliability of the simulation results proved, it is concluded that the hydraulic extrusion measures have good outburst prevention effect.
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