WATER-RESISTANT BULKHEAD (EN: water-proof cofferdam; DE: Wasserdamm; FR: barrage etanche, barrage impermable, barrage hydrofuge; ES: dique impermeable; RU: водоупорная перемычка) is the built structure for the insulation of the active underground mine workings against the sudden breakthroughs of the water into these mine workings.
The water-resistant bulkheads are constructed of the concrete, or of the reinforced concrete, and may be continuous, or with the hermetic metallic doors, which are opening towards the expected breakthrough of the water. The continuous water-resistant bulkheads are sub-divided into wedging single-stage (see the Figure, a) and wedging multi-stage (see the Figure, b), which they use in case of the high hydrostatic pressures within the coal, within the weak rocks, and within the rocks with the medium strength. Within the water-resistant bulkhead, there is stipulated the installation of the drainage pipes with the gate valves, which are allowing to regulate the inflow of the water. They construct the water-resistant bulkheads with the hermetic doors (see the Figure, v) in advance during the approach to the places, which have been flooded, or are dangerous because of the breakthroughs. In case of the breakthrough of the water, the people leave the mine working, and they close the doors.
Under the protection of the concrete water-resistant bulkheads, they also perform the discharge of the water from the flooded mine workings through the leading water-discharge boreholes. In this case, the water-resistant bulkhead, which is situated immediately within the stope of the mine working, is constructed as continuous, and the bulkhead, which is situated at the distance from the stope, is constructed with the hermetic doors.
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