Research on Overlying Rock-Coal Failure and Deformation Caused by Mining Protecting Strata, and Relieved Methane Drainage
|School||Anhui University of Technology|
|Keywords||Under the protection layer mining Gas drainage Rock and coal Fracture distribution Relief effect|
Based on the theory of rock and coal and gas migration , integrated use of theoretical analysis and computer numerical simulation , laboratory similar material simulation and on-site industrial test a variety of research methods , under the protection layer mining coal and rock overlying stress distribution , protection layer relief the deformation regularity and surface drilling relief gas drainage system . Obtained under the protection layer mining protected layer stress distribution , relief scope deformation law and ground drilling relief gas drainage effect ; mined under the protective layer of the protective layer can be fully relief , relief angle of protection of about 500 ; along the strike of the protective layer is divided into 5 areas \Under the protective layer under the influence of mining , the protective layer of gas pressure from the original 4.5MPa reduced to 0.6MPa the seam permeability coefficient becomes 1820 times before original permeability coefficient mining , the protective layer to get full relief . The Ground Gas drilling can move on mining -affected zone pressure relief gas for a long time , effectively pre - extraction . The results of this study highlight the risk of coal seam mining and regional Removing Outburst universal guiding significance and reference value .