煤层开采导水裂隙带发育高度分析

Analysis on development height of water flowing fractured zone in coal seam mining

针对煤层开采覆岩导水裂隙带发育高度问题,提出了一种基于工作面倾向长度、岩性以及岩层破裂边界角等因素的导水裂隙带发育高度计算公式。首先利用FLAC3D模拟软件证明工作面倾向长度对导水裂隙带发育高度具有重要影响,然后基于煤层开采后地下空间岩石碎胀填充达到应力平衡的基本原理,通过求解微分方程推导出煤层开采覆岩导水裂隙带发育高度计算公式。将该公式计算结果与现场实测结果进行对比分析,结果表明,两者吻合较好,且本文计算公式较现有经验公式计算结果更为准确。该公式可为覆岩导水裂隙带发育高度的计算提供思路和方法。

To address the issue of development height of water flowing fractured zone in coal seam,a new calculation formula was proposed based on the length of working face,lithology,and fractured boundary angle of overlying strata etc.Firstly,the Flac3 D simulation software was used to prove the important influence of the length of working face on the development height of water flowing fractured zone.And then based on the theory of dynamic stress equilibrium formed by expanded filling of ruptured rock mass,the formula of calculating the development height of water flowing fractured zone was derived by solving differential equation.The calculated result was compared with that from in-situ measurement,good agreement can be found.And it is also indicated that our proposed formula is even more accurate than the empirical formula,which implies that it can be used as a useful reference method to calculate the height of water flowing fractured zone.