barrier pillar
barrier pillar
A solid block or rib of coal, etc., left unworked between two collieries or mines for security against accidents arising from an influx of water.
Any large pillar entirely or relatively unbroken by roadways or airways that is left around a property to protect it against water and squeezes from adjacent property, or to protect the latter property in a similar manner.
Incorrectly used for a similar pillar left to protect a roadway or airway, or group of roadways or airways, or a panel of rooms from a squeeze