承压水上开采煤层底板隔水层裂隙演化 规律的试验研究

 奥陶系岩溶水是我国华北矿区煤矿安全生产的一大隐患，而带压开采是开采受底板突水威胁的煤层的有效方法之一。为深入分析承压水上煤层底板突水的危险性，自主设计煤层底板承压水水压加载系统，实现采用压力水袋对底板隔水层的承压水作用的物理模拟；分析底板隔水岩层的变形及破坏特征，得到底板隔水层的裂隙产生、发育直至导水通道形成规律。研究结果可为揭示承压水底板突水的力学机制提供参考。

EXPERIMENTAL RESEARCH ON FRACTURE EVOLUTION LAW OF WATER-RESISTING STRATA IN COAL SEAM FLOOR ABOVE AQUIFER

The Ordovician karst water is one of the hazards in the safe mining in North China. Mining above aquifer is one of the effective methods，which is used to exploit the coal seam threatened by water-inrush from floor. In order to analyze the water inrush risk from coal seam floor above aquifer，a water pressure loading system of the confined aquifer on coal seam floor is self-developed to realize the physical simulation of the confined aquifer acting on the aquifuge in floor using pressure water bags. The deformation and failure characteristics of aquifuge in floor are analyzed to obtain the rules of the fractures of floor developing，extending and running through each other. And then，the water-inrush passageway will be formed. The research results can provide references to the mechanical mechanism of water-inrush from floor.