大采高巨厚砂岩破碎顶板导硐掩护回采技术与实践

Technology and practice of coal winning with large mining height and thick sandstone broken roof using shield supporting scheme of pilot-tunneling

淮南矿业集团张集煤矿1412A工作面平均采高约5. 0 m,直接顶为巨厚砂岩直覆,平均厚约26 m,回采过程中,在超前支承压力作用下,煤壁片掉、顶板大块砂岩矸石垮冒,冒落最高处近20 m,造成工作面无法推进,且存在巨大的安全风险。为解决以上问题,保证工作面正常推进速度,拟采用架棚刷扩和超前导硐掩护的方法控制顶板。采用数值模拟方法,确定了合理的导硐起始施工位置和导硐掩护支护方案。实践表明,工作面成功连续推进,顶板得到了有效控制,为相关类似问题提供了借鉴。

In actual mining at 1412 A mining face of Zhangji Coal Mine of Huainan Mining Group, the average mining height is 5. 0 m and huge thick sandstone roof is 26 m, the coal wall and the roof is prone to breakage and caving under the action of leading bearing pressure, the height of roof caving is 20 m nearly, which caused the coal face can’t be normal mining and has huge security risks. In order to solve the above problems and ensure the normal advance speed of the coal face, it was proposed to use the method of shield support expansion and lead pilot-tunneling to control the roof.Based on the analysis of numerical simulation, the reasonable position and shield supporting scheme of pilot-tunneling were determined. the results showed that the coal face advanced successfully and continuously,and the roof were effectively controlled, which provides reference for similar problems.