底板岩体结构稳定性与底板突水关系的研究

将煤层底板至含水层之间承载能力最大的一层岩层看作底板关键层，从而将采场底板突水的研究转化为对底板关键层破断机制的研究，将关键层看作受水压等均布载荷作用的弹性薄板，得出了它的极限破断跨距公式，并提出了利用已知突水事故资料反演预测岩体强度的方法，提高了理论计算精度。最后，分析了底板关键层破断后的块体平衡条件，解释了突水点的分布特点与突水时产生的底鼓现象。

Relationship Between the Stability of Floor Structure and Water-inrush from Floor

In this paper the stratum with the most bearing capacity among strata from coalseam to aquifer is regarded as a key stratum in floor,Therefore,the study of water-inrushfrom mining floor is transformed into one of the fracture law of the key stratum. And the key stratum is considered to be an elastic thin plate under the uniform loads of water pressure etc,and its limiting fracture span is obtained.The way to predict the strength of rock mass fromthe known information of water-inrush accidents is put forward,which makes the calculatingprecision get improvernent.Finally,the equilibrium conditions of the rock blocks formed forthe fracture of the key stratum are analysed,and the distributed characteristic of water-inrushposition and the phenomenon of floor heave accompanying water-inrush are explained.