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特厚煤层水平分段开采围岩裂隙发育规律分析

Analysis on Developmental Law of Surrounding Rock Fracture in Horizontal Stratification of Extra Thick Coal Seam
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摘要 利用FLAC3D软件分析了水平分段开采工作面围岩应力及裂隙发育规律,旨在为后期瓦斯治理提供理论基础。研究表明:在煤层顶板出现明显卸压,卸压区类似"O"形分布,但倾向应力并不对称,呈现上部卸压,下部应力集中;开采后,下部煤体卸压明显,其卸压深度不等;下部煤体垂深15 m范围内,离层裂隙发育;顶板10 m左右的高度,竖直裂隙发育。 Analyzed the stress and crack growth law of surrounding rock in horizontal section mining by using FLAC3D. This study provides a theoretical basis for gas control at the later stage. The research shows that in the mining of coal seam roof along the inclined direction, the roof appear obvious pressure relief, pressure relief zone similar to the "O" type distribution, but along the seam side and asymmetry on exploitation of underpart produce stress concentration; sublevel mining after the lower coal body vertical stress appear obvious pressure relief, pressure relief at different depths. The lower part of the body 15 m range of delamination crack growth; vertical fracture distribute in distance coal seam roof 10 m height.
作者 汪长明
出处 《煤炭技术》 北大核心 2017年第6期18-21,共4页 Coal Technology
关键词 急倾斜 特厚煤层 围岩应力 采动裂隙 steeply inclined extra thick coal seam surrounding rock stress mining fracture
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