METHOD OF DAMP PROOF BULKHEAD ERECTION IN UNDERGROUND WORKING

摘要

The invention concerns mining engineering and may be used for isolation of underground working watered ground from a mining zone. The proposed method of drilling-and-blasting damp-proof bulkhead erection in an underground working allows improving of damp-proof properties of drilling-and-blasting rock bulkhead and thereby improving of underground work safety in difficult hydrogeological conditions. The assigned objective is accomplished in the following manner. The method of drilling-and-blasting rock bulkhead reaction by roof collapse, including two-stages formation of embankment by blasting of two sections of roof with reservation between them of rock mass in the shape of inverse trapezia, provides for forming from the inflow side an embankment which fully blocks the working. From the side opposite to the inflow a waterproof rubber-fabric membrane, whose edges are hermetically and nohermetically fixed on the bottom, walls and roof of the working, is put on the embankment material; the rubber-fabric membrane is covered with a layer of retaining lump rock by a pinpoint blast of the second section of the roof. The waterproof rubber-fabric membrane area and solidity, width of zone of its contact to the bottom, roof and walls of the working, height, volume and size of embankment lumps and retaining lump rock layer covering the rubber-fabric membrane are calculated depending on the roof rock properties, expected shifts of embankment wall covered with the rubber-fabric membrane and possible hydrostatic head.