Research on the Application of Mechanical Caving,Pressure Relief,and Permeability Gas Extraction Technology in Low Permeability Coal Seams
In order to solve the problem of gas extraction and control in low-permeability coal seams,taking the 8203 working face in Maojiazhuang Mine as the engineering background,the article explains the mechanical caving,pressure relief,and permeability gas extraction technology.After a mechanical caving,pressure relief,and permeability gas extraction calculation model is established,the influence rule of parameters such as the diameter of drilling hole,the spacing between drilling holes and negative pressure for gas extraction on pressure relief and permeability in low-permeability coal seams are researched;Research has shown that the larger the diameter of drilling holes,the better the pressure relief and permeability effect of coal seams.The larger the spacing between drilling holes,the larger the impact range,and the lower the pressure relief effect.The higher the negative pressure of gas extraction,the greater the gas extraction effect,and the impact on the pressure relief effect of coal seams is relatively small,however.These technologies were tested on site,and the on-site gas extraction effect was good,which provides reference for gas extraction and control in low-permeability coal seams.
low-permeability coal seammechanical cavingpressure relief and permeabilitygas extraction