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A Numerical Investigation of the Stress Relief Zones Around a Longwall Face in the Lower Seam for Gas Drainage Considerations

引用

Computer Modeling in Engineering & Sciences 2021年第4期127卷 135-157页

作者： Chunlei Zhang YPChugh Ruimin Feng Yong Zhang Wei Shen Jingke Wu Yushun Yang Faculty of Architecture and Civil Engineering Huaiyin Institute of TechnologyHuai’an223001China Mining and Mineral Resources Engineering Southern Illinois UniversityCarbondaleIllinois62901USA School of Mechanics and Civil Engineering China University of Mining&Technology(Beijing)Beijing100083China Department of Civil Engineering University of ArkansasFayettevilleAR 72701USA School of Energy and Mining Engineering China University of Mining&Technology(Beijing)Beijing100083China

Extraction of a protective coal seam (PVCS)-below or above a coal seam to be mined with the potential of coal andgas outburst risk-plays an important role not only in decreasing the stress field in the surrounding rock mass but alsoin increasing the gas desorption capacity and gas flow permeability in the protected coal seam (PTCS). The PVCSis mined to guarantee the safe mining of the PTCS. This study has numerically evaluated the stress redistributioneffects using FLAC3D model for a longwall face in Shanxi Province. The effects of mining depth, mining height andinter-burden rock mass properties were evaluated using the stress relief angle and stress relief coefficient. Verticalstress distribution, stress relief angle and stress relief coefficient in the PTCS were analyzed as the face advancedin the PVCS. The results showed that the stress relief achieved in different locations of the PTCS varied as the faceadvanced. Sensitivity analyses on the pertinent variables indicate that the stress relief in the PTCS is affected mostby the mining depth followed by the inter-burden lithology and the mining height. Furthermore, the elastic moduliof different layers within the inter-burden rock mass are more important than their uniaxial compressive strength(UCS) and Poisson’s ratio. These observations can guide gas drainage borehole design to minimize the accidentsof coal and gas outbursts.

关键词： Methane drainage longwall mining protective/protected coal seam multiple seams FLAC3D software stress relief zones

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