刀柱式残采区上行开采可行性研究

Reaearch on Feasibility in Pillar Ascending Mining of Left-over Coal

综合运用现场调研、理论计算、FLAC3D数值模拟等方法,对大同矿区某矿下部采用刀柱式开采后上覆煤层的移动变形特征进行了研究,在此基础上判定实施上行开采的可行性。研究表明:当下煤层采用刀柱式开采方法,所留煤柱能够支撑上覆岩层的全部重量时,煤柱及其顶板虽然遭到一定破坏,但仍能保持整体连续性,上覆煤层形成平缓的下沉盆地。随着下煤层开采后时间变长,煤柱及煤层的移动变形逐渐趋于稳定,满足上行开采所需条件。

The movement and deformation character of the above coal seam were analyzed after the low seam mined in pillars of one coal mine in Datong,through field research,theoretical calculations and FLAC3 D numerical simulation. Based on the movement and deformation of the above coal seam,the feasibility of ascending mining was determined. The research indicates that when the low coal seam was mined in pillars and the area of coal pillar was widespread,the integrity of the coal pillar and above coal seam could still maintain continuity,because the coal pillar could hold on the weight of above coal basin to a flat seam subsidence deformation generate in above coal seam. The movement and deformation character of the coal pillar and above coal seam could be gradually stabilized and meet the conditions necessary for mining.