Xiangshan Mine, Shaanxi Shaanxi Coal Hancheng Mining Co., Ltd.

陕西陕煤韩城矿业有限公司象山矿井21509工作面回风巷穿越多种不同属性的岩石,局部地段面临较大的巷道压力,强大的水平应力导致顶板明显下沉、底部膨胀严重,并使巷道两侧棚腿被挤出,拱棚发生了严重变形,经历多次扩修,巷道变形问题依旧难以控制。为应对深井高应力引发的严重底部膨胀,提出了一种支护体各受力方向不存在明显短板的多层次支护结构的措施,采用“留压注浆”技术以降低深部围岩的高位势能,并扩大支护圈的范围。通过该方法有效地弱化和转移了深部的高水平应力,显著提升了支护体的整体承载能力,巷道在服务期内的稳定性得到了有效保证,显著改善了底部膨胀和巷道变形问题。

The return air roadway of the 21509 working face in Xiangshan Mine of Shaanxi Shaanxi Coal Hancheng Mining Co., Ltd. passes through various types of rocks with different attributes, and local areas face relatively significant roadway pressure. The strong horizontal stress causes the roof to sink significantly, the bottom to expand severely, and the shed legs on both sides of the roadway to be squeezed out, causing serious deformation of the arch shed. After multiple expansions and repairs, the deformation problem of the roadway is still difficult to control. In order to cope with the severe bottom expansion caused by high stress in deep wells, a measure of multi-level support structure with no obvious short plates existing in each force direction of the support body is proposed. The "pressure retaining grouting" technology is adopted to reduce the high-level potential energy of the deep surrounding rock and expand the range of the support ring. Through this method, high-level stress of the deep is effectively weakened and transfered, the overall bearing capacity of the support body is significantly improved, the stability of the roadway during the service period is effectively guaranteed, and the problems of bottom expansion and roadway deformation are significantly improved.