查找垂直导水通道的水文地质试验方法

HYDROGEOLOGICAL TEST METHOD USED TO FIND THE VERTICAL CONDUCTOR

华北型煤田下伏的奥灰岩溶裂隙含水层，通过垂直导水构造与煤系含水层发生水力联系。这些垂直导水通道隐伏性强、横断面有限，用常规的水文地质勘探方法难以查找。在开滦、肥城等矿区，选择位于最下部可采煤层和奥灰之间的某一含水层作为“中间指示含水层”，在其中寻找反映下部水源补给含水层性质的“水文地质异常区”，通过放水试验，进一步缩小其范围，查明了３个垂直导水构造。以上实例说明在水文地质条件类似的大水矿区，应用此方法查找导水构造是可行的。

In Northern China type coal field,Ordovician Karst fissured aquifer has hydrodynamic relation to the aquifer in coalbearing series by the vertical conductor(VC).Because of VC's hiding and limited crosssection area,it is hard to find its location by conventional hydrogeological prospecting methods.In Kailuan and Feicheng Coal Bureau etc.,we have chose a certain aquifer between lowest coal seam and Ordovician aquifer as 'medium indicative aquifer',to find 'hydrogeological abnormal region'(HAR).Through dewatering test,we have further reduced the scope of HAR,discovered three vertical conductors.By test examples,it is illustrated that abovementioned method is feasible to find vertical conductor in abundant water coal mine similar to hydrogeological conditions.