DOI: 10.11799/ce202311045
Safety technology for advancing through overlying concentrated coal pillar in large mining height working face
ZHENG Jian
SHI Jiabin
Abstract：In view of the strong ground pressure under the overlying concentrated coal pillar in coal seam group mining,taking the mining under the coal pillar in 22104 working face with large mining height in Shangwan Coal Mine as the engineering background,the problem of ground pressure under the concentrated coal pillar mining in goaf were analyzed.Numerical simulation was used to study the variation of roof stress in the mining cycle under concentrated coal pillar during and after weighting.It was found that the huge difference of roof pressure before and after weighting would lead to strong ground pressure when the working face entered and exited the coal pillar.In view of the danger zone that may exist before the upper coal stopping line,a detailed hydraulic fracturing danger scheme is formulated and successfully implemented.The results show that hydraulic fracturing technology can significantly reduce the roof strength and the concentration of internal stress in coal pillar,reduce the weighting interval of roof,and realize the safe mining of over-concentrated coal pillar in large mining height working hydraulic fracturing.
Keywords：large mining height working facedynamic load mine pressureconcentrated coal pillarroof stresshydraulic fracturing
Publication Date：2023-12-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 74-78 )