Graphic Methods for Judging Sources of Roof Water Inrush - A Case Study, China

摘要

Water inrush usually is an exposure of hydrogeologic conditions of a coal mine and the characteristics of water-inrush itself could be used as indispensable evidences to quick judge the sources of water inrush. The graphic method is actually a specific application of hydrogeologic analysis. Using the limited data on an unexpected roof water inrush at Yuanbo coal mine (Shansi, China), this article developed a set of vertical and lateral graphic methods to judge the source aquifers, infer the water level of the source aquifers and analyze the reasons of roof inrush accident. It concluded that the sources of roof water inrush were the overlying fractured conglomerate aquifers and the medium-to-coarse sandstone aquifers, which got no direct recharge from the underlying Ordovician karst aquifers. It is advised that more hydrogeologic analysis expertise should be collected and published for wide dissemination, instead of learning the lessons and acquiring the expertise from accidents or hazards again and again.