METHOD FOR GROUND SURFACE PROTECTION AGAINST UNDERFLOODING DURING UNDERWORKING OPERATION PERFORMING Russian patent published in 2006 - IPC E21C41/16 E21F16/00 

FIELD: mining, particularly to prevent underflooding of ground areas to be shifted during underground mining performing.

SUBSTANCE: method involves forming contour trench-like cutoff curtain in ground; creating drainage devices inside the contour and removing water from ground movement trough. The contour trench-like cutoff curtain is arranged along predicted horizontal line of ground surface relief formed after ground subsidence and height mark thereof is higher than that of maximal ground water level in spring. Necessary throughput Q of drainage devices is set on the base of mathematical expressions.

EFFECT: increased safety of underground mineral mining.

2 dwg, 1 ex