MAKING OF CUTOFF CURTAIN IN SOIL BY DIRECTED BLAST INJECTION PROCESS Russian patent published in 2015 - IPC E02D3/12 

FIELD: mining.

SUBSTANCE: bore is drilled. Solid structure rock specimens from all lithological rock differences defining the soil depth with the limits of curtain depth. For all soil samples defined are the changes in normal strains in soil depth at the lower zone of the curtain to be created. Normal vertical strain, normal strain directed in horizontal plane along the dam slope dip line or relief depression slope line, normal strain directed in horizontal plane along the dam or the slope are defined. The number of points describing the change in magnitudes of normal strains at the curtain lower zone should be smaller than five with one metre spacing. Then, the distance from the transition from flat ground to hill side is defined by analytical relationship. Then, bores are drilled with spacing of 3.0 m. Injector is forced into the bores. Fixing agent is injected through said injector to get the lengthwise slit in the soil shaped to vertical fracture cavities oriented perpendicular to filtration flow by hydraulic impact.

EFFECT: higher efficiency of cutoff curtain under definite geological conditions, lower labour and material input.

1 ex, 1 tbl, 2 dwg