Research on outburst preventive technology of low permeability and high outburst fully mechanized working faces

摘要

Based on the theory of stress-relieved zone safety width before coal body,the theory of coal and gas outburst of working face is analyzed.The technology of stress-released zone shallow borehole drainage is put forward,and numerical simulation on gas seepage field distributing law in shallow borehole drainage is studied,and the result basically accords with the working field,that the is efficient to realized gas stress relieved and discharge,and improved the width of stress-relieved zone.This technology is used in Mine 4 of PingMei Group which is proved to have great effect on gas drainage and remarkably reduce the coal and gas outburst fatalness,and also preferably solved the gas exceeding problem in boring and producing.It is the most direct and efficient drainage way on gas prevention of low permeability and high outburst fully mechanized working faces,and besides,it is an innovation for gas drainage.This technology can also be used in high gas tunneling working face to improve the outburst prevention effect,which has good practicability and wide popularizing prospects.