Underground closure element construction material for underground shaft, gallery and borehole closures comprises construction blocks of sand and clay and/or bentonite

摘要

An underground closure element construction material comprises construction blocks of sand and clay and/or bentonite. A material for constructing long term stable underground closure elements consists of -10 wt.% sand of }10 mm particle size and }90 wt.% clay and/or bentonite powder of less than 1 mm fineness and is in the form of pre-compacted standard mine construction blocks of greater than 2.20 g/cm3 density and 3-10 wt.% water content.