U.S. and Afghan soldiers standing behind a blast wall made from HESCO bastions in Afghanistan in 2012
A blast wall is a barrier designed to protect vulnerable buildings or other structures and the people inside them from the effects of a nearby explosion, whether caused by industrial accident, military action, or terrorism.
^Smith, Peter. "THE EFFECTIVENESS OF BLAST WALLS"(PDF). www.civ.uth.gr/. Department of Civil Engineering, University of Thessaly. Retrieved 6 November 2014. (p. 5)