深部大采高工作面复合顶板运动规律及支架状态研究

Movement law of composite roof and support status in high-cutting working faces

深部大采高工作面复合顶板失稳易造成工作面动力灾害。以陕西黄陵二号煤矿大采高工作面群为研究对象,采用现场调查、数值计算、理论分析和现场监测等方法,综合分析顶板类型、顶板运动特征。根据围岩与支架关系及支架要求,确定选用ZY12000/28/63D的二柱掩护式支架。418工作面的直接顶由上部细砂岩和粉砂岩组成,共约21.2m;其中粉砂岩具有承载性,并为矿井来压提供力源。随工作面更替,各工作面塑性破坏及应力释放具有独立性,工作面位置尾端相对来压更剧烈。通过Analysis分析可知,满载下支架顶端的位移量大,构件连接处受力较大。现场表明,支架能够适应顶板运动造成的压力,满足工作面的支承需求,达到安全生产目的。

The instability of composite roof in deep high-cutting working face is easy to cause dynamic disaster. Therefore, understanding the movement law of composite roof and full load state of support is the prerequisite for safe mining in deep mine. Based on the background of the high-cutting working face group in No.2 Mine of Huangling Mining Group, field investigation, numerical calculation, theoretical analysis and field monitoring are applied to analyze the roof types and roof movement features. According to the relationship between surrounding rock and support and the requirements of support, ZY12000/28/63 D two-pillar shield support was selected. Research shows that, the 21.2 m direct roof of 418 working face is composed of overlying fine sandstone and siltstone, the siltstone has bearing capacity and is the force source for the mine weighting. With the changing of working faces, the plastic failure and stress relief are independent, and the weighting on working face end is more intensive. Analysis shows that, under full loading, the displacement at the top of the support, and the force at component connection is also large. Support is adaptive to the roof pressure during periodic weighting and can meet the need of safe production.