不同地形条件下工作面埋深对开采沉陷的影响

打开文本图片集

Abstract：To studythe impactof the working face depthon mining subsidenceunder the influence of different terain conditions，a coal mine in Shanxi Province was taken as the engineering background.A combination of theoretical analysis and MIDAS numerical simulations was used to study four situations： separately mining 8# and 11# coal under mountainous valley terrain conditions，and under plain terrain conditions.The surface movement and deformation characteristics，as wellas the overlying rock stres-strain characteristics of each model during the mining process， were compared and analyzed.The results indicate that the setlement funnel formed by two working faces during repeated horizontal mining will afect each other，and the surface subsidence after mining is the superposition of the surface subsidence caused by single working face mining.When mining the same working face，the impact of different terrain conditions on surface deformation difers，andas the depth of the working face increases，the influence of terrin onminingsubsidence decreases.As thedepthofthecoal seam increases，theoverall subsidence of the surface decreases.However，under the terrain conditions of mountainous vallys，as thecoalseam burial depth increases，the vertical displacement causedbycoal miningon thesurface directlyabove the middle coal pillar correspondingly increases.Theseresearch resultsprovide reference for surface protection and geological disaster prevention in similar loess valley areas.

Key words：mining subsidence； terrain conditions；working face burial depth；MIDAS； coal mine

煤炭开采对国民经济的贡献显著，2023年中国煤炭消费占能源总消费的 55.3%（ 国家统计局，2024）。（剩余20020字）