The Research Of The Crucial Technology To Soft Coal Heading Of Coal And Gas Outburst Regional Comprehensive Outburst Prevention

Bottom lane hydraulic punching technology is currently a very promising outburst prevention measures.But there are some key problems on the application of the technology need to be solved,for example:Bottom lane in the service of hydraulic punching and gas extraction for a long time;determine the reasonable spatial location in order to reduce maintenance quantity need to study;High pressure water jet can induce high intensity gas nozzle,How to avoid the gas nozzle and guarantee rushed out of the coal is relatively uniform need to study and so on.This topic to solve above problems,Using simplified continuous stress function with coal roadway surrounding rock damage theory and stress partition,Mathematical model of bottom plate extraction lane additional vertical stress,horizontal stress and shear stressis established and solved,and Optimize the space position of Bottom plate extraction lane;Study the principle of the gas nozzle,determine the "first note after" change the stress of coal and gas outburst prevention technique of desorption characteristics of spray,and the technology of equipment,process and water injection,punch selection of key parameters and optimized.Comprehensive mining space stress analysis and optimization of roadway location,punching during gas spray hole prevention programs,the first note after the key technical parameters,model cracks formation rule and gas extraction in coal seam,the formation of crushed surrounding rock of soft coal seam roadway after the first injection area bottom lane position determine technology research.Field application shows that Through the optimal placement of plate extraction from lane,The mine roadway maintenance cost per hundred meters to save 40000 yuan,Improve the production efficiency and reduce implement regional outburst prevention measures takes the production of space.First note after the regional comprehensive outburst prevention measures to alleviate the phenomenon of nozzle hole drilling,But not eliminate,it needs further perfecting the technological process and key parameters,in order to better guide the safety production.