School of Civil Engineering, Tsingtao Technological University School of Mechanics & Civil Engineering, China
University of Mining & Technology (Beijing)

为得到含隐伏小断层的煤层底板开采中的突水机理,分析底板裂隙演化及渗流突水通道的形成规律。采用RFPA2D-Flow软件分析了含隐伏小断层底板在工作面开采中,底板岩层破坏、突水通道的形成及突水发生的整个动态发展过程,得到了开采过程中底板岩层裂隙的产生和扩展演化、损伤破坏区域的形成过程及渗流场的运移过程。结果表明:底板隐伏小断层活化突水主要分为隐伏小断层活化和活化裂隙区域扩展2个阶段。底板不同位置隐伏小断层的裂隙贯通存在差异,距采空区越近,隐伏小断层越易活化形成突水通道,随着采空区卸压效果的增加,隐伏小断层突水的可能性逐步增大。

In order to obtain the water inrush mechanism of concealed minor faults in coal seam floor during mining, the authors analyzed the evolution law of the fl oor crack and the formation law of the seepage water inrush channel regulation. The RFPA2D- Flow software was applied to analyse the dynamic process development of floor rock crack development, perforation failure, the water inrush channel formation and floor water inrush during the process of mining in the concealed faults, crack production and extending, evolution process of the formation damage area and seepage transport progress in the mining were gained. The results showed that there we re two stages during the process of concealed minor faults water bursting, the active stage and the fracture zone expanding stage. There were some differences for cra ck connection of concealed minor faults in the different location of the floor, the nearer to the mined- out area, the more potential minor faults activation formed water in rush channel, with the increasing of goaf unloading concealed minor faults the possibility of water inrush was gradually increased.

国家自然科学基金资助项目(51234005)；