Influence of Sectional Coal Pillar Width of Protective Seam on Pressure Relief Effect of Protected Seam
QI Feng
Abstract：In order to achieve the economic, safe and efficient mining of the protected seam, simulation research was carried on the influence of the sectional coal pillar in different width of the protective seam upon the pressure relief effect of the protected seam on the basis of the stratum conditions of a mine and by using the calculation model of the mining-affected coal and rock mass which was built with FLAC3D software. The overburden strata of the coal pillar can be divided into the compression deformation zone, incomplete pressure relief zone and complete pressure relief zone. When the protected seam is located in the complete pressure relief zone, the coal seam will obtain full pressure-relief protection and the outburst danger will be eliminated. If the protected seam, the 8th coal seam is located in the complete pressure relief zone, the minimum theoretical width of the sectional coal pillar should be 5. 1 m. The investigation results showed that when the width of the sectional coal pillar was 5 m, the protected seam can obtain the continuous and full pressure-relief protection.
Keywords：mining of protective seamsectional coal pillarpressure relief effectstress coefficientexpansion deformation rate
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 10-13,18 )