补连塔煤矿四盘区顶板突水机理及防治

采用理论分析与工程测试相结合的方法，对神东矿区补连塔煤矿四盘区31401工作面异常突水机理进行了深入研究.结果表明：31401工作面突水的水源来自基岩（厚120～190 m）上部的砂砾含水层.按传统估算方法确定的顶板导水断裂带最大高度为55 m，达不到砂砾含水层，不应发生周期性的顶板突水.但2个钻孔实测的顶板导水断裂带高度达140.5～154.0 m，达到砂砾含水层，从而引发了工作面顶板突水.覆岩主关键层位置距离开采煤层较近,是导致顶板导水裂隙高度偏高和顶板异常突水的根本原因.根据四盘区所有钻孔柱状覆岩主关键层位置的判别结果，对四盘区后续工作面顶板突水危险区域作出了预测，31401工作面区域的预测结果已得到了生产实践的验证.

Water-inrush mechanism and prevention for fourth panel roof in Bulianta coalmine

Adoptted the method of theory analysis and engineering testing, studied on abnormal water inrush mechanism for No.31401 working face in the fourth panel of Bulianta coalmine in Shendong mining area. The results indicate that the source of water inrush at No.31401 working face come from sand gravel water bearing bed above basement rock whose height is 120～190 m. The height of water flowing fractured zone is 55 m by traditional estimation method, so that the water can not reach sand gravel water bearing bed and there should not have periodic roof water inrush. However, the height of water flowing fractured zone has reached 140.5～154.0 m through drilling tests, then the sand gravel water bearing bed can reach the sand gravel water bearing bed and lead to roof water inrush. The essential reason for the higher location of water flowing fractured zone and unexpenctant roof water inrush is the close interval between key stratum in overlying strata and the mining coal bed. Based on the distinguishing result of the location of the primary key stratums in the overlying strata of all drill histogram, forecasted the dangerous area that may occur roof water inrush in the following working faces in the fourth panel, and the forecast result of No.31401 working face were proved valid by practical production.