综放工作面割煤高度对瓦斯涌出的影响

Rules of mining height's influence on methane gushing and its application

为了解决综放开采工作面通风能力有限和瓦斯超限的问题,根据对不同割煤高度综放支架通风断面的比较,提出通过加大割煤高度提高综放工作面单产水平的方法。采用数值模拟方法研究了割煤高度对工作面瓦斯涌出规律的影响,结果显示割煤高度增加将增大通风断面,并使瓦斯浓度降低。针对现场具体条件,在保证煤壁稳定性的基础上,给出了特定煤层条件下合理的割煤高度。应用结果表明,加大割煤高度有利于综放工作面实现安全高效生产。

In order to resolve the problems of ventilation and methane,put forward increasing mining height based on comparison of ventilation cross-sections of powered supports with different mining heights.Numerical simulation was applied to research influence of mining height on methane gushing.Results show that larger mining height will increase ventilation cross-section and reduce methane concentration.Aiming at the actual condition of one mine,it obtained rational mining height for the mine with meeting the precondition of coal-wall stability.The application shows that increasing mining height is favorable for safety and high-efficiency of full-mechanized caving mining face.