晋城矿区残留煤复采工作面顶板及煤柱稳定性研究

发布时间：2018-04-25 10:39

本文选题：复采工作面 + 顶板冒落　；参考：《煤炭科学技术》2017年08期

【摘要】：针对晋城矿区3号煤层残留煤复采工作面存在顶板冒落问题,首先采用煤柱应力计对残留煤柱垂直应力进行了实测,然后建立3号煤层残留煤顶板矩形厚板模型,对残留煤顶板的挠曲变形进行了理论分析,得到了残留煤顶板的下沉规律。研究结果表明:在残留煤柱和巷道交叉点处发生拱形或椭圆形冒落,在残留煤柱区残留煤柱出现应力集中现象,煤柱压入底板,发生层状或拱形冒落;残留煤柱中心部位的垂直应力最大,约为13.7 MPa,残留煤柱采空区为应力降低区,在2个煤柱之间垂直应力最小;残留煤顶板下沉量以残留煤柱为中心向四边增加,呈椭圆状分布,残留煤柱两侧顶板下沉量较小,而煤柱采空区与巷道交叉点、交岔点等位置顶板下沉量较大,研究结果可为预防残留煤顶板冒落的难题提供了理论支撑。
[Abstract]:In view of the roof caving problem in the residual coal mining face of No. 3 coal seam in Jincheng mining area, the vertical stress of residual coal pillar is measured by coal pillar stress meter, and then the rectangular thick plate model of residual coal roof in No. 3 coal seam is established. The flexural deformation of residual coal roof is analyzed theoretically, and the subsidence law of residual coal roof is obtained. The results show that arch or elliptical caving occurs at the intersection of residual coal pillar and roadway, stress concentration occurs in residual coal pillar area, and the coal pillar is pressed into the floor, and layered or arch caving occurs. The vertical stress in the center of the residual coal pillar is the largest, about 13.7 MPa. The goaf of the residual pillar is the stress reducing area, and the vertical stress is the smallest between the two pillars, and the subsidence of the residual coal roof increases to the four sides with the residual coal pillar as the center, and the distribution is ellipsoid. The roof subsidence on both sides of the residual coal pillar is relatively small, while the roof subsidence at the intersection of the coal pillar goaf and the roadway, the intersection point and so on, is large. The research results can provide theoretical support for preventing the residual coal roof from falling off.
【作者单位】：晋能集团有限公司;
【基金】：山西省科技攻关工业类资助项目(20130321026-03)
【分类号】：TD327.2;TD82

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