上湾煤矿特厚煤层8.8m超大采高12403综采面顶板不易自然垮落,在工作面初采阶段,易导致顶板初次垮落步距较大,在顶板大面积瞬间垮落时会产生强烈的强矿压和飓风现象,从而导致人员伤亡及设备损坏等。为了保证工作面初采阶段的安全生产工作,上湾煤矿通过引进井下定向长钻孔水力压裂工艺技术对切眼顶板进行预裂,同时配合切眼三角区强放技术,对特厚煤层8.8m超大采高综采面切眼进行了初采放顶工作。实践表明:通过在上湾煤矿12403工作面进行煤层顶板定向长钻孔分段水力压裂工程施工,有效降低了顶板强度,缩小了初次放顶步距,为矿井安全高效回采提供技术保障,同时为大采高工作面初次放顶提供了治理经验。

The roof of 12403 8. 8 m super-high fully mechanized mining face in Shangwan Coal Mine is not easy to collapse naturally. In the initial mining stage of the working face, it is likely to lead to large initial roof caving interval, and produce strong mine pressure and hurricane phenomenon when the roof collapses instantly in a large area, causing casualties and equipment damage and other disasters. In order to ensure the safety of the initial production of the working face, the underground directional long borehole hydraulic fracturing technology was used to pre-fracture the roof of the open-off cut, and with the forced caving technology of the open-off cut triangle, the roof was caved in the open-off cut during the initial mining. The practice showed that: through the construction of long directional borehole segmental hydraulic fracturing of coal seam roof at the working face, strength of the roof and the initial roof caving interval were reduced, which provides technical guarantee for safe and efficient recovery, and management experience for initial roof caving of high-cutting mining face.