巨厚火成岩与奥灰水双重胁迫下矿井防治水技术研究

Study on water prevention and control technology under the threat of extremely thick igneous rock and ordovician limestone water in coal mine

根据邯邢矿区郭二庄矿9煤层开采受顶板巨厚火成岩和底板奥灰水双重胁迫的特点,分析了巨厚火成岩下煤层底板突水机理,通过数值模拟研究了顶板管理方法和奥灰水压的不同对煤层底板应力分布和变形破坏的影响。结果表明:巨厚火成岩顶板条件下充填开采和强制放顶比疏水降压对减小煤层底板扰动和破坏的作用效果显著,进而提出了以充填开采或强制放顶开采技术为主配合疏水降压的防治水技术;2911工作面开采实践证明该方案可以有效降低底板突水危险性。

As the 9 coal seam mining is threatened by the extremely thick igneous rock and ordovician limestone water in Guoerzhuang Coal Mine,the water inrush mechanism of coal seam floor is analyzed under extremely thick igneous rock according to the hydrogeological condition; numerical simulation is carried out to study the influence of roof management method and ordovician limestone water pressure to coal floor stress distribution and deformation. The results show that filling mining and forced caving rather than water drainage are of better effect to reduce disturbance and destruction of coal floor under the condition of extremely thick igneous rock roof,and then a water prevention and control technology is proposed using filling or forced caving mining assisted by water drainage; the practice in 2911 working face shows that this scheme can effectively reduce the risk of floor water inrush.