为了准确实测出工作面开采后覆岩导水裂缝带发育高度,提出了含水层判断导高的新判据。新判据分析认为,利用井下导高观测仪观测导水裂缝带高度时,观测钻孔施工过程中若穿透覆岩上方含水层,使承压水从钻孔内泻出,则说明导水裂缝带未发育至含水层层位高度。因此,实际工程应用中,在对导高进行合理预计的基础上,根据含水层是否被破坏分析含水层与导水裂缝带的层位关系可以作为确定导高的新判据。结合多个矿井工作面导高观测实例,验证了新判据判断覆岩导高值更为准确合理,具有更高的安全性。

This paper proposes a new kind of aquifer criterion to determine the permeable fractured zone's height after working face mining. The new criterion can be explained as follows. It is shown that if the permeable facture zone's height is monitored by the measuring instrument, one may see the designed drill break across the aquifer upon the fractured zone. Then the confined water would flow down through the drill. This phenomenon shows that the permeable fractured zone has not been developed to the height of the aquifer layer. So, whether the aquifer layer is destroyed may be taken as a new kind of criterion to determine the height of the permeable fractured zone. With this new criterion, one must analyze the layer relationship between the permeable fractured zone and the aquifer based on the reasonable prediction of the permeable fractured zone's height. According to the regression analysis of measured results of some coal mine's permeable fractured zone height, the new criterion is shown to be more accurate and safer in determining the permeable fractured zone's height.