Applying Combined Grouting with High Pressure and Sealing in Groups to Measuring Gas Pressure in Vertical Borehole

Aiming at complexly measuring gas pressure in vertical borehole in Wangfenggang Colliery,this paper puts forward a method of combined grouting with high pressure and sealing in groups.By testing in 4# geological detection vertical borehole,gas pressure in outbursting coal seam B116 with buried 1000m depth is obtained successfully,which provide technical support and base for formulating comprehensive gas prevention measure.