Gravel fill

Gravel fill

Crushed rock, pebbles, or gravel deposited at the bottom of an excavated wall, or footing, to ensure adequate drain age of water.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
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Without the retaining wall, the transportation department would have had to cut down the cedars and Douglas fir trees closest to the highway, replacing them with gravel fill to support the approach to the bridge, Wieseke said.
A "death strip" of swept gravel fills the space between the original wall and an reconstructed inner wall - the one that faced East Berlin - with cracks just big enough for visitors to peer through.