承压水沿煤层底板递进导升突水机理的模拟与观测

In situ measurement and physical analogue on water inrush from coal floor induced by progressive intrusion of artesian water into protective aquiclude

完整底板和非完整底板的注水试验表明，底板深处的耗水早于浅部，显示底板的破裂发生在采前。相似材料模拟具一定导升高度的底板在采动中的变化揭示了同样的规律，底板的原位测试发现承压水在采前出现了向上入侵的现象， 二次应力给导升的发展提供条件，递进导升是突水的一种机理。

The water injections into both fracturing and intact coal floor strata reveal that water drain in the lower part takes place earlier than in the upper part, and the break of rocks in deeper part of coal floor occurs before mining. The physical analogues on these two kinds of floor reveal the same phenomenon. In the in situ measurement it is found that the artesian water intrudes into the coal floor before mining. The paper considers that the secondary stress creates conditions for the development of the instruction of the artesian water. The progressive intrusion is one sort of mechanism for water inrush.