利民矿16煤首采工作面底板断裂带分布规律

The Distribution Law of Floor Fracture Zone of No.16 Coal Mining Face in Limin Coal Mine

为了避免承压水上开采引起工作面底板突水事故,针对利民矿奥陶系灰岩上方16煤1603首采工作面大采高、长工作面的特点,分别采用理论计算和数值模拟方法,对1603工作面底板断裂带分布规律进行研究。利用统计经验公式计算得出的底板最大破坏深度范围为24.30~26.60 m;利用数值模拟得出的底板最大破坏深度为21.10 m,位置位于切眼处煤壁前方5 m至后方10 m范围内及工作面下端头距煤壁10 m范围内的底板下方。对比理论计算以及数值模拟分析所得的底板断裂带结果,两者相互吻合,并根据此结果合理留设安全隔水煤柱。

To avoid the water inrush from the floor of the working face,according to the characteristics of large mining height and long working face of 1603 first mining face of 16 coal above Ordovician limestone in Limin Mine,theoretical calculation and numerical simulation method were used to study the distribution of the rupture zone of the 1603 working face.The maximum failure depth range of the floor is calculated by using the statistic empirical formula.The maximum failure depth range of floor calculated by statistical empirical formula is 24.30 to 26.60 m.The maximum failure depth of the floor obtained by numerical simulation is 21.10 m,which is located within the range of 5 m to 10 m in front of the coal wall at the cut hole and below the floor of the working face within the range of 10 m from the coal wall.Compared with the results of theoretical calculation and numerical simulation analysis,the two results are consistent with each other,and based on the results,a safe water-retaining pillar can be reasonably set up.