Barricade

1. The process of building a set of barriers to isolate a sufficient quantity of good air to protect mine workers from the asphyxiating gases formed after a fire or explosion. Miners wait behind the barrier until rescued. Used as an alternative to an escape attempt.
2. An artificial mound of earth, usually as high as the eaves of a magazine roof, that is erected to deflect the force of an explosion upward and to protect the enclosed building from flying objects.
3. Timber formwork to contain the material during hydraulic flushing in steep ore workings. Nelson

Source: Dictionary of Mining, Mineral, and Related Terms