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冲沟地貌近距下位煤层综放面进出煤柱期间顶板结构稳定性研究 被引量:4

Roof structure stability of fully mechanized caving face passing through coal pillar in short distance coal mining under gully landform
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摘要 针对冲沟地貌条件下近距离煤层群下位煤层综放面进出煤柱期间矿压显现剧烈问题,以上榆泉煤矿9^(#)、10^(#)煤层为工程背景,采用数值模拟方法分析了上位9^(#)煤层遗留煤柱集中应力的分布规律,探究了下位10^(#)煤层综放工作面进出煤柱期间采动应力与煤柱集中应力的叠加效应,结合工作面进出煤柱顶板结构模型,明确了顶板结构失稳方式为回转失稳与滑落失稳,回转角度与岩层断裂度为失稳的关键影响因素,针对顶板块体破坏方式提出煤柱下掘进工艺巷和减小采厚两种的进出煤柱期间压架灾害防治措施。可为冲沟地貌近距离煤层开采顶板控制与灾害防治提供借鉴。 Aiming at the acute mining pressure while entering and exiting the coal pillar under gully landform in fully mechanized caving in the lower part of the close coal seam group,the distribution law of the concentrated stress in the remained upper 9^(#) coal pillar is analyzed using numerical simulation with the engineering background of the 9^(#) and 10^(#) coal seams in Shangyuquan Coal Mine.The superposition effect caused by the mining stress and concentrated stress in coal pillar during the entry and exit of fully mechanized caving face in the lower 10^(#) coal seam is explored.Combining with the roof structure model,it is clear that the instability mode of roof structure are rotary instability and slide instability,rotary angle and rock fracture degree are the key influencing factors x.Hydraulic support extrusion disaster prevention measures are proposed in view of the roof plate failure mode,such as driving technology lane under coal pillar and reducing mining thickness.The result can provide reference for roof control and disaster prevention in short-distance coal mining in gully landform.
作者 石花军 SHI Hua-jun(Shangyuquan Coal Mine,CHN Energy Guoyuan Company,Hequ 036500,China)
出处 《煤炭工程》 北大核心 2022年第6期64-69,共6页 Coal Engineering
关键词 冲沟地貌 煤层群 综放开采 遗留煤柱 应力演化 顶板结构 灾害防治 gully landform coal seams group fully mechanized top-coal caving mining residual coal pillar stress evolution roof structure disaster prevention and control
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