Study On Investigation Of Preventing Outburst Effect By Driving Roadway Along Goaf In Xin'an Coal Mine

For the West Henan "three-soft" coal seam thickness in large, complex geological structure, low gas seepage coefficients and no protecting stratum mining,Xinancoal mine for the experiment to study driving roadway along goaf relief area and key technology of prevent outburst. The amount ultimately reduce the quantities of measures, improve drainage in order to reduce the time and the achievement of security measures to quickly remove Outburst purposes. Driving roadway along goaf the roadway layout in the relief area in outburst coal,after implementation of the measures driving roadway along goaf,the original stress distribution and stress field of gas were changed,Coal unloading of coal and reducing the outstanding risk.When driving roadway along goaf the roadway layout in the relief area,Pressure on smaller roadways, roadway deformation is also small, is conducive to roadway and maintenance.About technology of driving roadway along goaf, mined roadway layout in the relief area, the original stress and the gas flow field can be changed, to release the potential of coal gas; The coal seam gas drilling at the same time pre-pumping ,further reduce the coal seam gas pressure and gas content, Coal can also be caused by the contraction deformation of the body, decreased stress, increased permeability of coal and other changes to weaken until the purpose of eliminating outburst.In order to investigate measures along goaf outburst results, reasonable and effective relief to determine the scope of roadway. This paper studies are: driving roadway along goaf through the process and technical parameters of the study, re-examine the stress distribution around the roadway, optimization of the effective radius of influence roadway emissions, in reducing the amount of works and shorten the construction time of the situation, meet the remaining requirements of pillar width, multi-gas emissions, through the pressure relief antireflective technology to improve gas drainage volume and shorten the drainage time; eliminate the risk of outburst. There are three major research areas: site investigation, calculation and analysis, computer simulation. Specifically divided into the following areas:â‘ Face of mine and working face geological data collection and analysis, driving roadway along goaf technical parameters investigated;â‘¡Robustness for a low consistent coefficient of coal, gas seepage coefficient is poor, coal thickness variation in the circumstances, the evaluation of the stress after driving roadway along goaf distribution and working face relief effect and effect of outburst;â‘¢Through theoretical calculation and computer simulation, come to the left along driving roadway along goaf gas emissions consistent with the width of pillar requirements, and the roadway around and the stress change within the control of the situation.â‘£Measures in the driving roadway along goaf, measurement of residual gas content,indicators of cuttings gas analysis and The amount of drill cuttings S, results decreased significantly, Xinan mine for this kind of "soft" a serious outburst of low permeability, use.driving roadway along goaf measures to weaken or eliminate the risk of the outburst working face is very effective.