受采动影响管片结构斜井保护煤柱宽度的确定

Determination of the width of protective coal pillar under inclined shaft with segment structure affected by mining action

神华集团新街矿区的盾构法建设斜井在国内属首次.为了确保斜井投入运营后的稳定,沿斜井轴线不同位置选取了6个剖面,采用地层移动角理论和离散元数值模拟,对不同煤柱宽度下煤层开采,对盾构斜井管片结构稳定性的影响进行了分析,确定出斜井保护煤柱的合理宽度.结果表明:沿斜井轴线随着斜井管片到煤层距离的提高,所需要的保护煤柱宽度变大;模拟结果与工程实际相比较,二者规律基本吻合.

The construction of inclined shaft by shield method in New Street Mine is the first time adopted in the domestic. In order to ensure the stability of the inclined shaft after it puts into opera- tion, six sections are selected in different positions along the inclined shaft axis. Analysis of how coal mining affects the stability of shield inclined shaft with segment structure under different coal pillar widths using displacement angle of strata theory and discrete element simulation is used to determine the width of protective coal pillar. As a result, with the height from bottom plate of inclined shaft to the coal seam increasing, the width of protection coal pillar increases. The results were compared with the actual results, and the laws of the two are in good agreement.