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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。
In order to accurately measure the development height of water-conducting fractures in overlying strata after mining, a new criterion for determining aquifer bearing height is put forward. According to the new criterion analysis, when observing the height of the aqueduct with the observatory of downhole conductivity, if the aquifer above the overburden is penetrated during the observation of the borehole construction, the confined water will leak from the borehole, Fractures are not developed to the aquifer level height. Therefore, in practical engineering application, based on the reasonable prediction of the guide height, the relationship between the aquifer and the aqueduct can be analyzed according to whether the aquifer is damaged or not, which can be used as a new criterion to determine the elevation. Combined with the observation examples of multiple coal faces, it is verified that the new criterion is more accurate and reasonable in judging the overburden conductivity and has higher safety.