TEMPORARY PROTECTIVE ROCK WEB Russian patent published in 2020 - IPC E21F17/103 E21F5/00 

FIELD: protection methods.

SUBSTANCE: invention relates to a method of protection and is intended for attenuation of shock air waves (SAW) of large and super-rated power in mine openings in order to preserve underground structures and communications. TPBL (1) consists of rock-cut rock lying in passage (2) with cuts (3) and completely closing it. TPBL (1) is formed by preliminary driving of fans of paired risers (4), by filling borehole charges therein. In rock before TPBL (1) there are two adjacent side dead-end tunnel (5) at acute angle to direction of SAW (7) and transverse area equal to area of section of main passage (2), length 5…15 sizes of passage width (2). Two adjacent side dead-end tunnels (5) are additionally made "downward" - inclined downward from main passage (2) at acute angle 15…50° to SAW (7) direction.

EFFECT: reduction of power and time costs for release of passage of mine working from collapsed temporary protective bridging lintel (TPBL), and namely to facilitate filling of broken rock from pass of mine working to dead-end tunnels.

1 cl, 4 dwg