下组煤层工作面导水裂隙带发育特征研究

Study on the development characteristics of water-conducting fracture zone in lower group coal seam working face

导水裂隙带发育高度是确定煤体开采后是否与上覆含水层及采空积水沟通的关键参数。导水裂隙带发育沟通上采空积水区,将导致采空水经由新生裂缝涌入工作面。为确定下组15号煤层2101工作面导水裂隙带发育高度,采用理论计算、现场观测方法对覆岩层导水裂隙带的发育特征进行了观测研究。结果表明,现场实测裂隙带垂直发育高度为105.0 m,裂采比为13.13,裂隙带高度不会沟通上组煤层采空区,研究为矿井水害防治及保护矿区生态潜水提供了科学决策依据和技术支持。

The development height of water-conducting fracture zone is a key parameter to determine whether the coal body communicates with the overlying aquifer and mined water after mining.The water-conducting fracture zone develops an upper mined-out waterlogging area,which will lead to mined-out water flooding into the working face through new fractures.In order to accurately determine the development height of water-conducting fracture zone in 2101 working face of No.15 lower group,the development characteristics of water-conducting fracture zone in overburden strata are observed and studied by theoretical calculation and field observation methods.The results show that the vertical development height of the fracture zone is 105.0 m,the split-mining ratio is 13.13,and the height of the fracture zone cannot communicate with the goaf of the upper group of coal seam.The relevant results provide scientific decision-making basis and technical support for mine water disaster prevention and protection of ecological diving in mining area.