底板隔水层破坏的力学模型及破坏判据

Mechanical Model of Broken Floor Aquifuge and Failure Criterion

煤层底板到含水层之间通常有一层致密、隔水性好的岩层,称之为隔水层。承压水上采煤时,隔水层成为底板阻止含水层中高压水的唯一屏障,突水通道是否形成,决定了底板是否发生突水,而当底板岩层中没有断裂构造存在时,只有隔水层破坏,煤层底板才会产生突水通道发生突水。所以研究隔水层的破坏情况对研究承压水上采煤底板突水机制具有重要意义。

Aquifuge refers to a dense and impermeable rock stratum between coal seam floor and aquifer .When mining under bearing water ,aquifuge becomes the only barrier of floor to prevent pressure water at aquifer , whether there is water inrush in floor depends on the formation of water inrush channel .When there is no fault structure in rock stratum of floor ,the water inrush channel will occur water inrush only when the aquifuge is damaged .So the research on crashes aquifuge has great significance for the research of floor water inrush mecha‐nism w hile mining under bearing w ater .