Application of Active Strengthening Support Roof Cutting Gob-side Entry Retaining Technology in High Gas Thin Coal Seam
Based on the auxiliary air intake roadway of 3106 working face in Dengmaotong Coal Mine,the cantilever beam mechanical model of roof cutting and retaining roadway is established,and the mechani-cal principle of roof cutting with strengthened support is analyzed.Therefore,this paper puts forward the technology of actively strengthening support and guiding roof cutting and gob-side entry retaining,and for-mulates the technology of roof cutting and gob-side entry retaining and grouting reinforcement.The industri-al test shows that the maximum displacement of the roof and floor and the two sides of the active roof cutting and retaining roadway is 600 and 430 mm,which meets the stability requirements.The average flow rate of gas extraction in gob-side entry retaining is 3.16 m3/min,the average extraction concentration is 2.05%,and the gas content in the roadway is reduced.This technology provides a reference for solving the problem of gob-side entry retaining in high gas thin coal seam.
gob-side entry retainingroof cuttinghigh gasthin coal seamsurrounding rock defor-mation
NETL
NSTL
万方数据
