Abstract
Seam floor water-inrush accidents in mine stopes are often associated with fault structures in which water pressure resistance capacities are less than that of the intact seam floor. A new in situ water resistance capacity test was recently developed and used to determine the water resistance properties of a section of a normal fault. The in situ tests defined initial seepage conditions, the state of seepage after flow stabilized, and the measure and calculation of water resistance capability. The test results were used to calculate the unit seepage failure resistance strength, a quantification of the water pressure resistance capacity. It appears that such tests can be used to better evaluate the safety of coal extraction, and whether coal seams under inferred threat from water inrushes can be excavated safely without dewatering or depressurizing the underlying confined aquifers.
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